1. C program to input any three numbers and find out which one is the largest number.

c1.c

#include <stdio.h>

int findLargest(int num1, int num2, int num3);

void main() {
   int num1, num2, num3, largest;

   printf("Enter three numbers: ");
   scanf("%d %d %d", &num1, &num2, &num3);

   largest = findLargest(num1, num2, num3);

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

}

int findLargest(int num1, int num2, int num3) {
   int largest = num1;

   if (num2 > largest) {
      largest = num2;
   }
   if (num3 > largest) {
      largest = num3;
   }

   return largest;
}