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C Program to find greatest among three numbers

C Code Example — Conditional Programs

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C Program to find greatest among three numbers

Objective

Write a C program to find the greatest among three numbers using an if-else-if ladder.

Algorithm / Approach

  1. Declare three integer variables a, b, and c.
  2. Read the values from the user.
  3. Use the logical AND operator (&&) to check if a is greater than both b AND c.
  4. If false, use else if(b > c) to check if b is the greatest.
  5. If both previous conditions fail, then c must be the greatest (handled by the final else).
main.c 
#include<stdio.h>
int main( ){
int a, b, c;
printf("Enter Values for A,B & C : ");
scanf("%d%d%d",&a,&b,&c);
if(a>b && a>c) {
printf("A is Greatest\n") ;
}
else if(b>c){
printf("B is Greatest\n");
}
else {
printf("C is Greatest\n");
}
return 0;
}

Expected Output

Enter Values for A,B & C :
52 43 66
C is Greatest

Explanation of the Program

  • An if-else-if ladder is used when you need to check multiple conditions sequentially.
  • The Logical AND operator (&&) ensures that the entire condition is only true if ALL individual conditions are true.
  • In the else if(b > c) block, we don't need to check if b > a again, because if a was the greatest, the very first if statement would have caught it and the ladder would have exited.

Complexity

Time Complexity O(1)
Space Complexity O(1)
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