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General Introduction Algorithms. Let’s write a program  A program is a collection of statements written in a language the computer understands.  A computer.

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Presentation on theme: "General Introduction Algorithms. Let’s write a program  A program is a collection of statements written in a language the computer understands.  A computer."— Presentation transcript:

1 General Introduction Algorithms

2 Let’s write a program  A program is a collection of statements written in a language the computer understands.  A computer executes program statements one after another in sequence until it reaches the end of the program unless some statement in the program alters the order of execution.  Let’s write a program to accept two numbers from the user, multiply them together and display the result on the screen.  We’ll write the program in COBOL.  What COBOL program statements will we need to do the job?

3 Program Statements  We need a statement to take in the first number and store it in a named memory location. l l ACCEPT Num1.  We need a statement to take in the second number and store it in a named memory location. l l ACCEPT Num2.  We need a statement to multiply the two numbers together and store the result in a named location. l l MULTIPLY Num1 BY Num2 GIVING Result.  We need a statement to display the result on the screen. l l DISPLAY "Result is = ", Result.

4 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. Program-1 PROGRAM-ID. Program-1. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result Calc-Result. ACCEPT Num1. MULTIPLY Num1 BY Num2 GIVING Result. ACCEPT Num2. DISPLAY "Result is = ", Result. STOP RUN. Num1 Num2 Result 0 0 0 0 00 D ATA

5 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Program-1. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result. ACCEPT Num1 ACCEPT Num1. MULTIPLY Num1 BY Num2 GIVING Result. ACCEPT Num2. DISPLAY "Result is = ", Result. STOP RUN. Num1 Num2 Result 9 9 0 0 00 D ATA

6 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Program-1. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result. ACCEPT Num1. MULTIPLY Num1 BY Num2 GIVING Result MULTIPLY Num1 BY Num2 GIVING Result. ACCEPT Num2. DISPLAY "Result is = ", Result. STOP RUN. Num1 Num2 Result 9 9 0 0 00 D ATA

7 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Program-1. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result. ACCEPT Num1. MULTIPLY Num1 BY Num2 GIVING Result. ACCEPT Num2 ACCEPT Num2. DISPLAY "Result is = ", Result. STOP RUN. Num1 Num2 Result 0 0 5 5 00 D ATA

8 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Program-1. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result. ACCEPT Num1. MULTIPLY Num1 BY Num2 GIVING Result. ACCEPT Num2. DISPLAY "Result is = ", Result DISPLAY "Result is = ", Result. STOP RUN. Num1 Num2 Result 9 9 5 5 00 D ATA Oh No!! We got the wrong answer. Let’s try again.

9 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. Program-2 PROGRAM-ID. Program-2. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result Calc-Result. ACCEPT Num1. ACCEPT Num2. DISPLAY "Result is = ", Result. MULTIPLY Num1 BY Num2 GIVING Result. STOP RUN. Num1 Num2 Result 0 0 0 0 00 D ATA

10 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Program-2. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result. ACCEPT Num1. ACCEPT Num2. DISPLAY "Result is = ", Result. MULTIPLY Num1 BY Num2 GIVING Result. STOP RUN. Num1 Num2 Result 9 9 0 0 00 D ATA

11 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Program-2. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result. ACCEPT Num1. ACCEPT Num2 ACCEPT Num2. DISPLAY "Result is = ", Result. MULTIPLY Num1 BY Num2 GIVING Result. STOP RUN. Num1 Num2 Result 9 9 5 5 00 D ATA

12 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Program-2. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result. ACCEPT Num1. ACCEPT Num2. DISPLAY "Result is = ", Result DISPLAY "Result is = ", Result. MULTIPLY Num1 BY Num2 GIVING Result. STOP RUN. Num1 Num2 Result 9 9 5 5 00 D ATA Oh No!! We got the wrong answer again. Let’s have one more try.

13 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Program-2. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result. ACCEPT Num1. ACCEPT Num2. DISPLAY "Result is = ", Result. MULTIPLY Num1 BY Num2 GIVING Result MULTIPLY Num1 BY Num2 GIVING Result. STOP RUN. Num1 Num2 Result 9 9 5 5 45 D ATA

14 Num1 Num2 Result $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. Sequence-Program PROGRAM-ID. Sequence-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result Calc-Result. ACCEPT Num1. ACCEPT Num2. MULTIPLY Num1 BY Num2 GIVING Result. DISPLAY "Result is = ", Result. STOP RUN. 0 0 0 0 00 D ATA

15 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Sequence-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result. ACCEPT Num1 ACCEPT Num1. ACCEPT Num2. MULTIPLY Num1 BY Num2 GIVING Result. DISPLAY "Result is = ", Result. STOP RUN. 9 000 Num1 Num2 Result D ATA

16 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Sequence-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result. ACCEPT Num1. ACCEPT Num2 ACCEPT Num2. MULTIPLY Num1 BY Num2 GIVING Result. DISPLAY "Result is = ", Result. STOP RUN. 9 5 00 Num1 Num2 Result D ATA

17 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Sequence-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result. ACCEPT Num1. ACCEPT Num2. MULTIPLY Num1 BY Num2 GIVING Result MULTIPLY Num1 BY Num2 GIVING Result. DISPLAY "Result is = ", Result. STOP RUN. 95 45 Num1 Num2 Result D ATA

18 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Sequence-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. PROCEDURE DIVISION. Calc-Result. ACCEPT Num1. ACCEPT Num2. MULTIPLY Num1 BY Num2 GIVING Result. DISPLAY "Result is = ", Result DISPLAY "Result is = ", Result. STOP RUN. 95 45 Num1 Num2 Result D ATA Right.. At last!! It’s not enough to know what statements we need. We must make sure the computer executes them in the right order.

19  Sequence.  Selection.  Iteration. Programs are written using three main programming constructs Programs are written using three main programming constructs.

20 Num1 Num2 Result Operator $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. Selection-Program PROGRAM-ID. Selection-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator Calculator. ACCEPT Num1. ACCEPT Num2. ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF. DISPLAY "Result is = ", Result. STOP RUN. 0 0 0 0 00 D ATA _ _

21 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Selection-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. ACCEPT Num1 ACCEPT Num1. ACCEPT Num2. ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF. DISPLAY "Result is = ", Result. STOP RUN. Num1 Num2 Result Operator 7 7 0 0 00 D ATA _ _

22 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Selection-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. ACCEPT Num1. ACCEPT Num2 ACCEPT Num2. ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF. DISPLAY "Result is = ", Result. STOP RUN. Num1 Num2 Result Operator 7 7 3 3 00 D ATA _ _

23 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Selection-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. ACCEPT Num1. ACCEPT Num2. ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF. DISPLAY "Result is = ", Result. STOP RUN. Num1 Num2 Result Operator 7 7 3 3 00 D ATA + +

24 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Selection-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. ACCEPT Num1. ACCEPT Num2. ACCEPT Operator IF Operator = "+" THEN IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF. DISPLAY "Result is = ", Result. STOP RUN. Num1 Num2 Result Operator 7 7 3 3 00 D ATA + +

25 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Selection-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. ACCEPT Num1. ACCEPT Num2. ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF. DISPLAY "Result is = ", Result. STOP RUN. Num1 Num2 Result Operator 7 7 3 3 10 D ATA + +

26 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Selection-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. ACCEPT Num1. ACCEPT Num2. ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF END-IF. DISPLAY "Result is = ", Result. STOP RUN. Num1 Num2 Result Operator 7 7 3 3 10 D ATA + +

27 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Selection-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. ACCEPT Num1. ACCEPT Num2. ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF. DISPLAY "Result is = ", Result DISPLAY "Result is = ", Result. STOP RUN. Num1 Num2 Result Operator 7 7 3 3 10 D ATA + +

28 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. Iteration-Program PROGRAM-ID. Iteration-Program. AUTHOR. Team SarMag. DATA DIVISION DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. PERFORM 5 TIMES ACCEPT Num1 ACCEPT Num2 ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF DISPLAY "Result is = ", Result END-PERFORM. STOP RUN. D ATA Num1 Num2 Result Operator 0 0 0 0 00 D ATA _ _

29 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Iteration-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. PERFORM 5 TIMES PERFORM 5 TIMES ACCEPT Num1 ACCEPT Num2 ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF DISPLAY "Result is = ", Result END-PERFORM END-PERFORM. STOP RUN. D ATA Num1 Num2 Result Operator 0 0 0 0 00 D ATA _ _

30 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Iteration-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. PERFORM 5 TIMES ACCEPT Num1 ACCEPT Num1 ACCEPT Num2 ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF DISPLAY "Result is = ", Result END-PERFORM. STOP RUN. D ATA Num1 Num2 Result Operator 5 5 0 0 00 D ATA _ _

31 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Iteration-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. PERFORM 5 TIMES ACCEPT Num1 ACCEPT Num2 ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF DISPLAY "Result is = ", Result END-PERFORM. STOP RUN. D ATA Num1 Num2 Result Operator 5 5 3 3 00 D ATA _ _

32 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Iteration-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. PERFORM 5 TIMES ACCEPT Num1 ACCEPT Num2 ACCEPT Operator ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF DISPLAY "Result is = ", Result END-PERFORM. STOP RUN. D ATA Num1 Num2 Result Operator 5 5 3 3 00 D ATA * *

33 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Iteration-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. PERFORM 5 TIMES ACCEPT Num1 ACCEPT Num2 ACCEPT Operator IF Operator = "+" THEN IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF DISPLAY "Result is = ", Result END-PERFORM. STOP RUN. D ATA Num1 Num2 Result Operator 5 5 3 3 00 D ATA * *

34 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Iteration-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. PERFORM 5 TIMES ACCEPT Num1 ACCEPT Num2 ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF DISPLAY "Result is = ", Result END-PERFORM. STOP RUN. D ATA Num1 Num2 Result Operator 5 5 3 3 00 D ATA * *

35 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Iteration-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. PERFORM 5 TIMES ACCEPT Num1 ACCEPT Num2 ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF DISPLAY "Result is = ", Result END-PERFORM. STOP RUN. D ATA Num1 Num2 Result Operator 5 5 3 3 15 D ATA * *

36 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Iteration-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. PERFORM 5 TIMES ACCEPT Num1 ACCEPT Num2 ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF DISPLAY "Result is = ", Result DISPLAY "Result is = ", Result END-PERFORM. STOP RUN. D ATA Num1 Num2 Result Operator 5 5 3 3 15 D ATA * *

37 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Iteration-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. PERFORM 5 TIMES ACCEPT Num1 ACCEPT Num1 ACCEPT Num2 ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF DISPLAY "Result is = ", Result END-PERFORM. STOP RUN. D ATA Num1 Num2 Result Operator 9 9 3 3 15 D ATA * *

38 $ SET SOURCEFORMAT"FREE" IDENTIFICATION DIVISION. PROGRAM-ID. Iteration-Program. AUTHOR. Team SarMag. DATA DIVISION. WORKING-STORAGE SECTION. 01 Num1 PIC 9 VALUE ZEROS. 01 Num2 PIC 9 VALUE ZEROS. 01 Result PIC 99 VALUE ZEROS. 01 Operator PIC X VALUE SPACE. PROCEDURE DIVISION. Calculator. PERFORM 5 TIMES ACCEPT Num1 ACCEPT Num2 ACCEPT Operator IF Operator = "+" THEN ADD Num1, Num2 GIVING Result END-IF IF Operator = "*" THEN MULTIPLY Num1 BY Num2 GIVING Result END-IF DISPLAY "Result is = ", Result END-PERFORM. STOP RUN. D ATA Num1 Num2 Result Operator 9 9 3 3 15 D ATA * *

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