Algorithm
1. Prompt the user to enter an operator (+, -, *, /).
2. Accept two numbers as input (num1, num2).
3. Use a switch-case statement on the entered operator.
- Case '+':
- Display the result of num1 + num2.
- Case '-':
- Display the result of num1 - num2.
- Case '*':
- Display the result of num1 * num2.
- Case '/':
- If num2 is not zero:
- Display the result of num1 / num2.
- Else:
- Display an error message for division by zero.
- Default:
- Display an error message for an invalid operator.
4. End.
Code Examples
#1 Code Example-Ceate calculator using switch...case
Code -
C Programming
/**
* C program to create Simple Calculator using switch case
*/
#include <stdio.h>
int main()
{
char op;
float num1, num2, result=0.0f;
/* Print welcome message */
printf("WELCOME TO SIMPLE CALCULATOR\n");
printf("----------------------------\n");
printf("Enter [number 1] [+ - * /] [number 2]\n");
/* Input two number and operator from user */
scanf("%f %c %f", &num1, &op, &num2);
/* Switch the value and perform action based on operator*/
switch(op)
{
case '+':
result = num1 + num2;
break;
case '-':
result = num1 - num2;
break;
case '*':
result = num1 * num2;
break;
case '/':
result = num1 / num2;
break;
default:
printf("Invalid operator");
}
/* Prints the result */
printf("%.2f %c %.2f = %.2f", num1, op, num2, result);
return 0;
}Output
----------------------------
Enter [number 1] [+ - * /] [number 2]
22 * 6
22.00 * 6.00 = 132.00
#2 Code Example-C Program to create calculator using switch...case and functions
Code -
C Programming
/**
* C program to create simple calculator using switch case and functions
*/
#include <stdio.h>
/**
* Function declarations for calculator
*/
float add(float num1, float num2);
float sub(float num1, float num2);
float mult(float num1, float num2);
float div(float num1, float num2);
int main()
{
char op;
float num1, num2, result=0.0f;
/* Print welcome message */
printf("WELCOME TO SIMPLE CALCULATOR\n");
printf("----------------------------\n");
printf("Enter [number 1] [+ - * /] [number 2]\n");
/* Input two number and operator from user */
scanf("%f %c %f", &num1, &op, &num2);
switch(op)
{
case '+':
result = add(num1, num2);
break;
case '-':
result = sub(num1, num2);
break;
case '*':
result = mult(num1, num2);
break;
case '/':
result = div(num1, num2);
break;
default:
printf("Invalid operator");
}
/* Print the result */
printf("%.2f %c %.2f = %.2f", num1, op, num2, result);
return 0;
}
/**
* Function to add two numbers
*/
float add(float num1, float num2)
{
return num1 + num2;
}
/**
* Function to subtract two numbers
*/
float sub(float num1, float num2)
{
return num1 - num2;
}
/**
* Function to multiply two numbers
*/
float mult(float num1, float num2)
{
return num1 * num2;
}
/**
* Function to divide two numbers
*/
float div(float num1, float num2)
{
return num1 / num2;
}Output
----------------------------
Enter [number 1] [+ - * /] [number 2]
22 * 6
22.00 * 6.00 = 132.00
Demonstration
C Programing Example to create calculator using switch case and functions-DevsEnv