Explain else-if ladder statement in C language


This is the most general way of writing a multi-way decision.

Syntax

Refer the syntax given below −

if (condition1)
stmt1;
else if (condition2)
stmt2;
- - - - -
- - - - -
else if (condition n)
stmtn;
else
stmt x;

Algorithm

Refer the algorithm given below −

START
Step 1: Declare int variables.
Step 2: Read a,b,c,d values at runtime
Step 3: i. if(a>b && a>c && a>d)
Print a is largest
ii.else if(b>c && b>a && b>d)
Print b is largest
iii. else if(c>d && c>a && c>b)
Print c is largest
iv. else
print d is largest
STOP

Example

Following is the C program to execute Else If Ladder conditional operators −

 Live Demo

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

Output

You will see the following output −

Run 1:Enter the values of a,b,c,d: 2 4 6 8
8 is the largest
Run 2: Enter the values of a,b,c,d: 23 12 56 23
56 is the largest

Consider another C program which display the grade of student using else if ladder −

 Live Demo

#include<stdio.h>
int main(){
   int marks;
   printf("Enter the marks of a student:
");    scanf("%d",&marks);    if(marks <=100 && marks >= 90)       printf("Grade=A");    else if(marks < 90 && marks>= 80)       printf("Grade=B");    else if(marks < 80 && marks >= 70)       printf("Grade=C");    else if(marks < 70 && marks >= 60)       printf("Grade=D");    else if(marks < 60 && marks > 50)       printf("Grade=E");    else if(marks == 50)       printf("Grade=F");    else if(marks < 50 && marks >= 0)       printf("Fail");    else       printf("Enter a valid score between 0 and 100");    return 0; }

Output

You will see the following output −

Run 1:
Enter the marks of a student:78
Grade=C
Run 2:
Enter the marks of a student:98
Grade=A

Updated on: 22-Feb-2021

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