C program for Simple Calculator

In this tutorial you will learn about the C program for Simple Calculator and its application with practical example.

In this tutorial, we will learn to create a C program. After that, will perform Simple Calculator in C programming.

Table Of Contents−

C Program for Simple Calculator

Prerequisites

Before starting with this tutorial, we assume that you are the best aware of the following C programming topics:

Operators in C Programming.

Basic Input and Output function in C Programming.
Basic C Programming.
Switch Case in C programming

Program for Simple Calculator:-

In today’s tutorial, we will create a program. That will do the Addition, Subtraction, Multiplication, and Division operations with the help of Arithmetic operators in C programming.

Algorithm:-

1. Declaring the variables for the program.

2. Taking the input numbers from the user in number format.

3. Adding the numbers and storing it in a variable.

4. Subtracting the numbers and storing it in a variable.

5. Multiplying the numbers and storing it in a variable.

6. Dividing the numbers and storing it in a variable.

7. Printing the Outputs.

8. End program.

1. Declaring the variables for the program.

2. Taking the input numbers from the user in number format.

3. Adding the numbers and storing it in a variable.

4. Subtracting the numbers and storing it in a variable.

5. Multiplying the numbers and storing it in a variable.

6. Dividing the numbers and storing it in a variable.

7. Printing the Outputs.

8. End program.

Program Code:-

#include <stdio.h>
int main() 
{
  //declaring the rwequired variable for the program 
  char op;
  double first, second;
  //taking the input variable for the program
  printf("Enter an operator (+, -, *, /): ");
  scanf("%c", &op);
  printf("Enter two operands: ");
  scanf("%lf %lf", &first, &second);
  //Calculating the arithmetic operations using switch case
  switch (op) {
    case '+':
      printf("%.1lf + %.1lf = %.1lf", first, second, first + second);
      break;
    case '-':
      printf("%.1lf - %.1lf = %.1lf", first, second, first - second);
      break;
    case '*':
      printf("%.1lf * %.1lf = %.1lf", first, second, first * second);
      break;
    case '/':
      printf("%.1lf / %.1lf = %.1lf", first, second, first / second);
      break;
    // operator doesn't match any case constant
    default:
      printf("Error! operator is not correct");
  }

  return 0;
}

#include <stdio.h>

int main()

{

//declaring the rwequired variable for the program

char op;

double first, second;

//taking the input variable for the program

printf("Enter an operator (+, -, *, /): ");

scanf("%c", &op);

printf("Enter two operands: ");

scanf("%lf %lf", &first, &second);

//Calculating the arithmetic operations using switch case

switch (op) {

case '+':

printf("%.1lf + %.1lf = %.1lf", first, second, first + second);

break;

case '-':

printf("%.1lf - %.1lf = %.1lf", first, second, first - second);

break;

case '*':

printf("%.1lf * %.1lf = %.1lf", first, second, first * second);

break;

case '/':

printf("%.1lf / %.1lf = %.1lf", first, second, first / second);

break;

// operator doesn't match any case constant

default:

printf("Error! operator is not correct");

}

return 0;

}

Output:-

In the above program, we have first initialized the required variable.

op = it will hold the input character value from the user.
first = it will hold the input number value from the user.
second = it will hold the input number value from the user.

Taking Input numbers from the user.

Performing simple calculations.

Printing the output.

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C program for Simple Calculator