This document provides examples of if, if else, nested if else, and else if statements in C programming. It also includes an example of a switch statement. Each code example is accompanied by its output to demonstrate the logic and flow of each conditional statement type. The examples cover basic conditional checks, nested conditionals, and using else if versus multiple if statements.

1. Mrs. G. Nagalakshmi, M.Sc., M.Phil.,
Ms. N. Malathi, M.Sc.,
Programming in C (18UAMA41)
II B.Sc. Mathematics (SF)

7. Example of if statement
#include <stdio.h>
#include <conio.h>
void main()
{
int x = 20;
int y = 22;
if (x<y)
printf("Variable x is less than y);
getch();
}
Output:
Variable x is less than y

9. Example for if … else statement
#include <stdio.h>
#include <conio.h>
void main()
{
int age;
printf("Enter your age:");
scanf("%d",&age);
if(age >=18)
{
printf("You are eligible for voting");
}
else
{
printf("You are not eligible for voting");
}
getch();
}
Output:
Enter your age:14 You are not eligible for voting

11. Example of nested if..else
#include <stdio.h>
#include <conio.h>
void main()
{
int var1, var2;
printf("Input the value of var1:");
scanf("%d", &var1);
printf("Input the value of var2:");
scanf("%d",&var2);
if (var1 != var2)
{
printf("var1 is not equal to var2n");
if (var1 > var2)
printf("var1 is greater than var2n");
else
printf("var2 is greater than var1n");
}
else
printf("var1 is equal to var2n");
getch();
}

12. Example of nested if..else
Output:
Input the value of var1:12
Input the value of var2:21
var1 is not equal to var2
var2 is greater than var1

15. Example for elseif
#include <stdio.h>
#include <conio.h>
void main()
{
int var1, var2;
printf("Input the value of var1:");
scanf("%d", &var1);
printf("Input the value of var2:");
scanf("%d",&var2);
if (var1 !=var2)
printf("var1 is not equal to var2n");
else if (var1 > var2)
printf("var1 is greater than var2n");
else if (var2 > var1)
printf("var2 is greater than var1n");
Else
printf("var1 is equal to var2n");
getch();
}

16. Example for elseif
Output:
Input the value of var1:12
Input the value of var2:21
var1 is not equal to var2

19. Example for switch statement
#include <stdio.h>
#include <conio.h>
int main()
{
int num = 8;
switch (num)
{
case 7:
printf("Value is 7");
break;
case 8:
printf("Value is 8");
break;
case 9:
printf("Value is 9");
break;
default:
printf("Out of range");
break;
}
getch();
}
Output: