Explain Nested if-else statement in C language


A ‘nested if’ is an if statement that is the object of either if (or) an else. ‘if’ is placed inside another if (or) else.

Syntax

Refer the syntax given below −

if (condition1){
   if (condition2)
      stmt1;
   else
      stmt2;
}
else{
   if (condition3)
      stmt3;
   else
      stmt4;
}

Example

Given below is the C program to execute Nested If Else conditional operators −

 Live Demo

#include<stdio.h>
void main (){
   int a,b,c,d;
   printf("Enter the values of a,b,c: 
");    scanf("%d,%d,%d",&a,&b,&c);    if((a>b)&&(a>c)){//Work with 4 numbers//       if(a>c){          printf("%d is the largest",a);       } else {          printf("%d is the largest",c);       }    } else {       if(b>c){          printf("%d is the largest",b);       } else {          printf("%d is the largest",c);       }    } }

Output

You will see the following output −

Enter the values of a,b,c: 3,5,8
8 is the largest

Example

Following is the C program to check the number is positive or negative

 Live Demo

#include <stdio.h>
int main(){
   int num;
   printf("Enter a number:
");    scanf ("%d ", &num);    if(num > 0){       printf("This is positive num:%d
", num);    }    else if(num < 0){       printf("This is a negative num:%d",num);    } else {       printf("This is a zero:%d",num);    }    return 0; }

Output

You will see the following output −

Run 1: Enter a number:
23
23=This number is positive
Run 2: Enter a number:
-56
-56=This number is negative

Updated on: 15-Mar-2021

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