1. LESSON 3 IO, Variables and Operators

2. 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.

3. 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?

4. 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.

5. Variable
Memory places to store data.
123
Total

7. Data Types

8. 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.

9. 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

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

11. Format Specifier

12. Sample Code Write a program that will print the following output:
#include<stdio.h>
#include<conio.h>
void main(); {
int value1 = 10;
float value2 = ;
double value3 = ;
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:
Value 3:
Value 4: C
Store the initial values to a variable.

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

14. 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

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

16. 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(); }

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

18. 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(); }

19. Arithmetic Operators

20. C Language Expression

21. Precedence of Operators