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Basic
Switch Case
Goto
Operators
if Statement
Nested if
While Loop
For Loop
Patterns
Array
2D Array
Structure
Pointers
Excersises
Others



C Program to Find Largest Among Four Numbers


The following example shows, how to find largest among four numbers.

  • Takes four integer inputs from the user.
  • Uses nested if statements to compare all four numbers.
  • Determines the largest number through step-by-step comparisons.
  • Displays the largest number as the output.

Example : pgm.c

#include <stdio.h>

void main() {
    int a, b, c, d, largest;

    // Input four numbers
    printf("Enter four numbers: ");
    scanf("%d %d %d %d", &a, &b, &c, &d);

    // Nested if logic to find the largest
    if (a > b) {
        if (a > c) {
            if (a > d)
                largest = a;
            else
                largest = d;
        } else {
            if (c > d)
                largest = c;
            else
                largest = d;
        }
    } else {
        if (b > c) {
            if (b > d)
                largest = b;
            else
                largest = d;
        } else {
            if (c > d)
                largest = c;
            else
                largest = d;
        }
    }

    printf("The largest number is: %d\n", largest);
}

Output:

Enter four numbers: 11 49 15 26
The largest number is: 49