How to find Largest among three numbers using pointer

C-Pointer

In this article, we will learn about How to find Largest among three numbers using pointer with examples.

1. C Program to find Largest among three numbers using pointer

In this example, we are taking 3 numbers as input from the user and then using the pointers, we are doing the comparison using the if-else statements to find the largest number among the 3 numbers input by the user.

#include<stdio.h>
int main()
{
  float Num1, Num2, Num3;
  float *ptrNum1, *ptrNum2, *ptrNum3;

  ptrNum1=&Num1;
  ptrNum2=&Num2;
  ptrNum3=&Num3;

  printf("Please enter three number:");
  scanf("%f %f %f", ptrNum1, ptrNum2, ptrNum3);

  if(*ptrNum1 > *ptrNum2)
  {
    if(*ptrNum1 > *ptrNum3)
      printf("The Largest Number is  = %.2f", *ptrNum1);
    else
      printf("The Largest Number is  = %.2f", *ptrNum3);
  }

  else
  {
    if(*ptrNum2 > *ptrNum3)
      printf("The Largest Number is  = %.2f", *ptrNum2);
    else
      printf("The Largest Number is  = %.2f", *ptrNum3);
  }

  return 0;
}

Output

Please enter three number:90
23
56
The Largest Number is  = 90.00

2. C Program to find Largest among three number using pointer & function

In this example, we are modifying the logic which we used in the above code. Here we have moved the comparison code to a separate function. This function will take 3 numbers as input and will tell us which one is the biggest number.

#include<stdio.h>

void findLargestNumber(int *No1, int *No2, int *No3);

int main()
{
  int Num1, Num2, Num3;
  int *ptrNum1, *ptrNum2, *ptrNum3;

  ptrNum1 = &Num1;
  ptrNum2 = &Num2;
  ptrNum3 = &Num3;

  printf("Please enter three number: ");
  scanf("%d %d %d", ptrNum1, ptrNum2, ptrNum3);

  findLargestNumber(ptrNum1, ptrNum2, ptrNum3);

  return 0;
}

void findLargestNumber(int *No1, int *No2, int *No3)
{
  if( (*No1 > *No2) && (*No1 > *No3) )
  {
    printf("The Largest Number is  = %d", *No1);
  }
  else if((*No2 > *No1) && (*No2 > *No3))
  {
    printf("The Largest Number is  = %d", *No2);
  }
  else
  {
    printf("The Largest Number is  = %d", *No3);
  }
}

Output

Please enter three number: 78
45
89
The Largest Number is  = 89

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