C Program for Addition Subtraction Multiplication Division using Function

Here we will write a C program for addition subtraction multiplication and division using the function. First, we will create a simple program to solve the program, then we will write the same program where input is taken and the result is displayed using functions. At last, we will develop a menu-driven program, where the user has a choice, which operation he/she wants to perform addition or subtraction or multiplication or division. Previously we had already developed a program for addition, subtraction, multiplication, and division operation but without using the function.

C Program for Addition Subtraction Multiplication and Division using the Function

Program description:- C program for addition subtraction multiplication and division using the function.

#include<stdio.h>

// functions declaration
int add(int n1, int n2);
int subtract(int n1, int n2);
int multiply(int n1, int n2);
int divide(int n1, int n2);

// main function
int main()
{
  int num1, num2;

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

  printf("%d + %d = %d\n", num1, num2, add(num1, num2));
  printf("%d - %d = %d\n", num1, num2, subtract(num1, num2));
  printf("%d * %d = %d\n", num1, num2, multiply(num1, num2));
  printf("%d / %d = %d\n", num1, num2, divide(num1, num2));

  return 0;
}

// function to add two integer numbers
int add(int n1, int n2)
{
  int result;
  result = n1 + n2;
  return result;
}

// function to subtract two integer numbers
int subtract(int n1, int n2)
{
  int result;
  result = n1 - n2;
  return result;
}

// function to multiply two integer numbers
int multiply(int n1, int n2)
{
  int result;
  result = n1 * n2;
  return result;
}

// function to divide two integer numbers
int divide(int n1, int n2)
{
  int result;
  result = n1 / n2;
  return result;
}

Output for the different test-cases:-

Enter two numbers: 20 5
20 + 5 = 25
20 – 5 = 15
20 * 5 = 100
20 / 5 = 4

In this program we have taken two integer numbers, you can also take floating-point numbers in your own program. But in that case inside every function replace the int keyword with a float or double.

Program2

Program:- Write a C program for addition subtraction multiplication and division. Perform every operation through function. Take input inside a user-defined function, and also display the result from another user-defined function.

#include<stdio.h>

// function declarations
int input();
void display(int n1, int n2, char ch, int result);
void add(int n1, int n2);
void subtract(int n1, int n2);
void multiply(int n1, int n2);
void divide(int n1, int n2);

// main function
int main()
{
  int n1, n2;
  n1 = input();
  n2 = input();

  add(n1, n2);
  subtract(n1, n2);
  multiply(n1, n2);
  divide(n1, n2);
  return 0;
}

// function for taking input from user
int input()
{
  int n;
  printf("Enter number: ");
  scanf("%d",&n);
  return n;
}

// function for displaying the result.
void display(int n1, int n2, char ch, int result)
{
  printf("%d %c %d = %d\n", n1, ch, n2, result);
}

// function for addition of two numbers
void add(int n1, int n2)
{
  int result;
  result = n1 + n2;
  display(n1, n2, '+', result);
}

// function for subtraction of two numbers
void subtract(int n1, int n2)
{
  int result;
  result = n1 - n2;
  display(n1, n2, '-', result);
}

// function for multiplication of two numbers
void multiply(int n1, int n2)
{
  int result;
  result = n1 * n2;
  display(n1, n2, '*', result);
}

// function for division of two numbers
void divide(int n1, int n2)
{
  int result;
  result = n1 / n2;
  display(n1, n2, '/', result);
}

Output:-

Enter number: 19
Enter number: 9
19 + 9 = 28
19 – 9 = 10
19 * 9 = 171
19 / 9 = 2

Menu-driven C Program for Addition Subtraction Multiplication and Division using Function

Program description:- Write a menu-driven program to find addition, subtraction, multiplication, and division of two numbers using the user defined functions and the program should accept choice from the user repeatedly.

#include<stdio.h>

// function for taking input from user
float input()
{
  float n;
  scanf("%f",&n);
  return n;
}

// function for displaying the result
void display(float n1, float n2, char ch, float result)
{
  printf("%.2f %c %.2f = %.2f\n", n1, ch, n2, result);
}

// function for addition of two numbers
void add(int n1, float n2)
{
  float result;
  result = n1 + n2;
  display(n1, n2, '+', result);
}

// function for subtraction of two numbers
void subtract(float n1, float n2)
{
  float result;
  result = n1 - n2;
  display(n1, n2, '-', result);
}

// function for multiplication of two numbers
void multiply(float n1, float n2)
{
  float result;
  result = n1 * n2;
  display(n1, n2, '*', result);
}

// function for division of two numbers
void divide(float n1, float n2)
{
  float result;
  result = n1 / n2;
  display(n1, n2, '/', result);
}

// main function
int main()
{
  char ch;
  int choice;
  float n1, n2;

  // do-while loop
  do
  {
    printf("Enter first number: ");
    n1 = input();
    printf("Enter second number: ");
    n2 = input();
     
    printf("\nWhich operation you want to perform,\n");
    printf("1.Addition\n");
    printf("2.Subtraction\n");
    printf("3.Multiplication\n");
    printf("4.Division\n");
    printf("Enter your choice: ");
    scanf("%d", &choice);
     
    switch (choice) {
      case 1:
        add(n1, n2);
        break;
      case 2:
        subtract(n1, n2);
        break;
      case 3:
        multiply(n1, n2);
        break;
      case 4:
        divide(n1, n2);
        break;
      default:
        printf("Invalid choice");
    }

    printf("\nDo you want to continue (y/n): ");
    scanf("%c",&ch);
    scanf("%c",&ch);
    printf("***************************************\n");

  } while(ch=='y');

  printf("\nThank You.");
  return 0;
}

Output Samples:-

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