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Nested if Statement In C
Nested if...else
It is possible to include an if...else statement inside the body of another if...else statement.
Example : Nested if...else
This program given below relates two integers using either <, > and = similar to the if...else ladder's example. However, we will use a nested if...else statement to solve this problem.
#include <stdio.h>
int main() {
int num1, num2;
printf("Enter two integers: ");
scanf("%d %d", &num1, &num2);
if (num1 >= num2) {
if (num1 == num2) {
printf("Result: %d = %d",num1,num2);
}
else {
printf("Result: %d > %d", num1, num2);
}
}
else {
printf("Result: %d < %d",num1, num2);
}
return 0;
}
OUTPUT:
Enter two integers: 5
4
Result: 5 > 4
If the body of an if...else statement has only one statement, you do not need to use brackets {}.
Example: The code in C for the above described example where we need to analyse if the number is even or odd, and then if it is even, whether it is divisible by 4 or not, and if it is odd, whether it is divisible by 3 or not will be
#include <stdio.h>
int main() {
// variable to store the given number
int n;
printf("Enter a Number : ");
//take input from the user
scanf("%d", &n);
//if else condition to check whether the number is even or odd
if (n % 2 == 0) {
//the number is even
printf("Even ");
//nested if else condition to check if n is divisible by 4 or not
if (n % 4 == 0) {
//the number is divisible by 4
printf("and divisible by 4");
} else {
//the number is not divisible by 4
printf("and not divisible by 4");
}
} else {
//the number is odd
printf("Odd ");
//nested if else condition to check if n is divisible by 3 or not
if (n % 3 == 0) {
//the number is divisible by 3
printf("and divisible by 3");
} else {
//the number is not divisible by 3
printf("and not divisible by 3");
}
}
return 0;
}
OUTPUT:
Enter a Number : 12
Even and divisible by 4
OUTPUT 2:
Enter a Number : 15
Odd and divisible by 3
OUTPUT 3:
Enter a Number : 17
Odd and not divisible by 3
Example : Check if three numbers are equal
Given three numbers, we need to check if all of them are equal in value or not.
#include <stdio.h>
int main() {
// variables to store the three numbers
int a, b, c;
printf("Enter 3 Numbers : ");
//take input from the user
scanf("%d %d %d", &a, &b, &c);
//if else condition to check whether first two numbers are equal
if (a == b) {
//nested if else condition to check if c is equal to a and b
if (a == c) {
//all are equal
printf("Yes");
} else {
//all are not equal
printf("No");
}
} else {
//the first two numbers are not equal, so they are not equal
printf("No");
}
return 0;
}
OUTPUT 1:
Enter 3 Numbers : 4 4 4
Yes
OUTPUT 2:
Enter 3 Numbers : 3 4 5
No