In this tutorial, we will write a C program to find the largest of three input numbers using pointers.

Program to find largest number using pointers

In the following program we have three integers num1, num2 & num3. We have assigned the addresses of these three numbers to three pointers p1, p2 & p3 respectively. Later we performed the comparison on the values stored at the addresses pointed by pointers using if else statement.

#include <stdio.h>
int main()
{
    int num1, num2, num3;
    int *p1, *p2, *p3;

    //taking input from user
    printf("Enter First Number: ");
    scanf("%d",&num1);
    printf("Enter Second Number: ");
    scanf("%d",&num2);
    printf("Enter Third Number: ");
    scanf("%d",&num3);

    //assigning the address of input numbers to pointers
    p1 = &num1;
    p2 = &num2;
    p3 = &num3;
    if(*p1 > *p2)
    {
	if(*p1 > *p3)
	{
		printf("%d is the largest number", *p1);
	}
	else
	{
		printf("%d is the largest number", *p3);
	}
    }
    else
    {
	if(*p2 > *p3)
	{
		printf("%d is the largest number", *p2);
	}
	else
	{
		printf("%d is the largest number", *p3);
	}
    }
    return 0;
}

Output: