C Program to Create Simple Calculator

In this article, we will show you, How to write a C Program to Create Simple Calculator using Switch case, Functions, and Else If Statement.

C Program to Create Simple Calculator Example 1

This program helps user to enter the Operator (+, -, *, or /) and two values. Using those two values and operand, it will perform Arithmetic Operations. For this example, we used the Switch case to check which operand is inserted by the user. Next, based on the Operand result will be displayed

/* C Program to Create Simple Calculator using Switch Case */
 
#include <stdio.h>
 
int main()
{
	char Operator;
	float num1, num2, result = 0;
	
	printf("\n Please Enter an Operator (+, -, *, /)  :  ");
  	scanf("%c", &Operator);
  	
	printf("\n Please Enter the Values for two Operands: num1 and num2  :  ");
  	scanf("%f%f", &num1, &num2);
  	
  	switch(Operator)
  	{
  		case '+':
  			result = num1 + num2;
  			break;
  		case '-':
  			result = num1 - num2;
  			break;  			
  		case '*':
  			result = num1 * num2;
  			break;
  		case '/':
  			result = num1 / num2;
  			break;
		default:
			printf("\n You have enetered an Invalid Operator ");				    			
	}
  
	printf("\n The result of %.2f %c %.2f  = %.2f", num1, Operator, num2, result);
	
  	return 0;
}

OUTPUT

C Program to Create Simple Calculator Example 2

This is the same program that we used in the first example. But this time we are performing the arithmetic operation directly inside the Switch blocks.

/* C Program to Create Simple Calculator using Switch Case */
 
#include <stdio.h>
 
int main()
{
	char Operator;
	float num1, num2, result = 0;
	
	printf("\n Please Enter an Operator (+, -, *, /)  :  ");
  	scanf("%c", &Operator);
  	
	printf("\n Please Enter the Values for two Operands: num1 and num2  :  ");
  	scanf("%f%f", &num1, &num2);
  	
  	switch(Operator)
  	{
  		case '+':
  			printf("\n The result of %.2f + %.2f  = %.2f", num1, num2, num1 + num2);
  			break;
  		case '-':
  			printf("\n The result of %.2f - %.2f  = %.2f", num1, num2, num1 - num2);
  			break;  			
  		case '*':
  			printf("\n The result of %.2f * %.2f  = %.2f", num1, num2, num1 * num2);
  			break;
  		case '/':
  			printf("\n The result of %.2f / %.2f  = %.2f", num1, num2, num1 / num2);
  			break;
		default:
			printf("\n You have enetered an Invalid Operator ");				    			
	}
	
  	return 0;
}

OUTPUT

C Program to Create Simple Calculator Example 3

In this example we are using the Else If Statement to create a simple calculator.

/* C Program to Create Simple Calculator using Else If */
 
#include <stdio.h>
 
int main()
{
	char Operator;
	float num1, num2, result = 0;
	
	printf("\n Please Enter an Operator (+, -, *, /)  :  ");
  	scanf("%c", &Operator);
  	
	printf("\n Please Enter the Values for two Operands: num1 and num2  :  ");
  	scanf("%f%f", &num1, &num2);
  	
  	if(Operator == '+')
  	{
  		printf("\n The result of %.2f + %.2f  = %.2f", num1, num2, num1 + num2);
  	}
  	else if(Operator == '-')
  	{
  		printf("\n The result of %.2f - %.2f  = %.2f", num1, num2, num1 - num2);
  	}
  	else if(Operator == '*')
  	{
  		printf("\n The result of %.2f * %.2f  = %.2f", num1, num2, num1 * num2);
  	}
  	else if(Operator == '/')
  	{
  		printf("\n The result of %.2f / %.2f  = %.2f", num1, num2, num1 / num2);
  	}
  	else
  	{
  		printf("\n You have enetered an Invalid Operator ");
	}
	
  	return 0;
}

OUTPUT

C Program to Create Simple Calculator Example 4

This is the same program that we used in the first example but, this time we separated the arithmetic operations logic using Functions.

/* C Program to Create Simple Calculator using Switch Case */
 
#include <stdio.h>
float add(float a, float b);
float sub(float a, float b);
float multi(float a, float b);
float div(float a, float b);

int main()
{
	char Operator;
	float num1, num2, result = 0;
	
	printf("\n Please Enter an Operator (+, -, *, /)  :  ");
  	scanf("%c", &Operator);
  	
	printf("\n Please Enter the Values for two Operands: num1 and num2  :  ");
  	scanf("%f%f", &num1, &num2);
  	
  	switch(Operator)
  	{
  		case '+':
  			result = add(num1, num2);
  			break;
  		case '-':
  			result = sub(num1, num2);
  			break;  			
  		case '*':
  			result = multi(num1, num2);
  			break;
  		case '/':
  			result = div(num1, num2);
  			break;
		default:
			printf("\n You have enetered an Invalid Operator ");				    			
	}
  
	printf("\n The result of %.2f %c %.2f  = %.2f", num1, Operator, num2, result);
	
  	return 0;
}

float add(float a, float b)
{
	return a + b;
}

float sub(float a, float b)
{
	return a - b;
}

float multi(float a, float b)
{
	return a * b;
}

float div(float a, float b)
{
	return a / b;
}

OUTPUT

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