LESSON 3 IO, Variables and Operators

Review 1 #include(stdio.h) #include<conio.H> void Main() { printf(“English /n”); print(“Physics”); printf(“Chem”) get ch; } Find the syntax error in each line.

Sample Code What is the output of the program? #include <stdio.h> #include <conio.h> void main() { clrscr(); // printf(“English \n”); /* printf(“Physics”); printf(“Chemistry”);*/ printf(“Engineering Workshop”); getch(); } What is the output of the program?

Review 2 Find the syntax error in each line. #include<stdio.h> #include<conio.h> void main(); { printF(“English \n”); printf(Physics”); printf(‘Chem’); /printf(“Math”); /*printf(“Math”); getch(); } Find the syntax error in each line.

Variable Memory places to store data. 123 Total

Data Types

Rules in Naming a Variable Variables must consist of letters, digits and underscore (_) only. It should not be a keyword. White space is not allowed. Special characters/symbol NOT allowed. In one program 2 variables cant have the same name.

C Keywords auto break case char const continue default do double else enum extern float for goto if inline int long register return short signed sizeof static struct switch typedef union unsigned void volatile while

Valid/Invalid Variable Names X int Name double first@name NAME name2 first_name _name first-name 2name first name v.a.l.u.e

Format Specifier

Sample Code Write a program that will print the following output: #include<stdio.h> #include<conio.h> void main(); { int value1 = 10; float value2 = 3.1416; double value3 = 123.456; char value4 = ‘C’; printf(“Value 1: %d \n”, value1); printf(“Value 2: %f \n”, value2); printf(“Value 3: %1f \n”, value3); printf(“Value 4: %c \n”, value4); getch(); } Write a program that will print the following output: Value 1: 10 Value 2: 3.1416 Value 3: 123.456 Value 4: C Store the initial values to a variable.

Tell what data type will you use for the following data? Sample Declaration 10 936.36 50000 ‘x’ 412.00

Tell what data type will you use for the following data? Sample Declaration 10 int int n1=10; 936.36 float float n2=936.36; 50000 int n3=50000; ‘x’ char char n4=‘x’; 412.00 float n5=412.00

Write a program that adds two integers of 30 and 10. Problem Write a program that adds two integers of 30 and 10.

Solution #include<stdio.h> #include<conio.h> void main() { int n1,n2,sum; n1=30; n2=10; sum=n1+n2; printf(“Sum result of %d and %d = %d”, n1,n2,sum); getch(); }

Problem Write a program that reads two integers from keyboard and finds the addition of two the two numbers.

Solution #include<stdio.h> #include<conio.h> void main() { int n1,n2,sum; printf(“Enter first number”); scanf(“%d”,&n1); printf(“Enter second number”); scanf(“%d”,&n2); sum=n1+n2; printf(“Sum result of %d and %d = %d”, n1,n2,sum); getch(); }

Arithmetic Operators

C Language Expression

Precedence of Operators