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C Program to Add Two Numbers Using Call by Reference

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The program takes the two numbers from the user and passes the reference to the function where the sum is calculated. You may go through the topic below.

#include <stdio.h>

//user-defined function
float addFunc(float *a, float *b)
{
  float sum;

  sum = *a + *b;

  return sum;
}

int main()
{
  float num1, num2, result;

  printf("Enter the first number: ");
  scanf("%f", &num1);

  printf("Enter the Second number: ");
  scanf("%f", &num2);

  result = addFunc(&num1, &num2);

  printf("Sum of the result: %f", result);

  return 0;
}

Output:

Enter the first number: 15.5
Enter the Second number: 20.5
Sum of the result: 36.000000

This is a simple C program that demonstrates the use of a user-defined function to add two floating-point numbers. Let’s break down the code:

Function Declaration:

float addFunc(float *a, float *b)
  • This line declares a function named addFunc that takes two float pointers (a and b) as parameters and returns a float value.

Function Definition:

{ float sum; sum = *a + *b; return sum; }
  • Inside the addFunc function, it calculates the sum of the values pointed to by a and b and returns the result.

Main Function:

int main()
{
    // Variable declaration
    float num1, num2, result;

    // Input from user
    printf("Enter the first number: ");
    scanf("%f", &num1);

    printf("Enter the Second number: ");
    scanf("%f", &num2);

    // Function call
    result = addFunc(&num1, &num2);

    // Output
    printf("Sum of the result: %f", result);

    return 0;
}
  • The main function is the entry point of the program.
  • It declares three float variables num1, num2, and result.
  • It takes user input for num1 and num2 using scanf.
  • Calls the addFunc function, passing the addresses of num1 and num2.
  • Prints the result.

Execution:

  • The program prompts the user to enter two floating-point numbers.
  • It then calculates the sum of these numbers using the addFunc function.
  • Finally, it prints the result to the console.

So, if the user enters, for example, 5.3 and 2.7, the program would output:

Enter the first number: 5.3
Enter the Second number: 2.7
Sum of the result: 8.000000

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