## Q. C program to make a simple calculator using switch case.

Here you will find an algorithm and program in C programming language to make a simple calculator. First let us understand what is calculator?

Explanation : A calculator is used to make mathematical calculations. In this program we will create a simple calculator that can perform an arithmetic operation (+, -, *, /).

## Calculator Program Algorithm

```START
Step 1 : Initialise the two numbers.
Step 2 : Ask the user to enter an option by giving six options.
Step 3 : After getting the option from the user write if conditions for every operation based on the option.
Step 4 : Perform the respective operation.
Step 5 : Print the result.
STOP
```

# C Program to Make a Simple Calculator

```#include <stdio.h>
int main() {
char ch;
double num1, num2;
printf("Enter an operator (+, -, *, /): ");
scanf("%c", &ch);
printf("Enter two operands: ");
scanf("%lf %lf", &num1, &num2);
switch (ch) {
case '+':
printf("%.1lf + %.1lf = %.1lf", num1, num2, num1 + num2);
break;
case '-':
printf("%.1lf - %.1lf = %.1lf", num1, num2, num1 - num2);
break;
case '*':
printf("%.1lf * %.1lf = %.1lf", num1, num2, num1 * num2);
break;
case '/':
printf("%.1lf / %.1lf = %.1lf", num1, num2, num1 / num2);
break;

// operator doesn't match any case constant
default:
printf("Error! operator is not correct");
}
return 0;
}

```

#### Output

```Enter an operator (+, -, *, /): *
Enter two operands: 8 6
8.0 * 6.0 = 48.0
```