C programs to practice : basic calculator using switch case

   Switch case is used to select the operations from many statements. Here, a simple calculation program is given below.

First, get the operation to performed.

Next, get the two inputs.

Based on the inputs, perform the operation and display the results.

Now ,the program begins….

“calculate.c”

#include<stdio.h>

#include<conio.h>

void main()

{

 char operation,

 double a,b;

printf(“Enter the operation: +, - , /, * , % ”);

scanf(“%c”,&operation);

printf(“Enter the numbers”);

scanf(“ %lf %lf”, &a,&b);

switch(operation)

{

 case ‘+’ :

               printf(“ %.1lf + %.1lf : %.1lf”, a,b,a+b);

               break;

case ‘-’ :

               printf(“ %.1lf - %.1lf : %.1lf”, a,b,a-b);

               break;

case ‘/’ :

               printf(“ %.1lf / %.1lf : %.1lf”, a,b,a/b);

               break;

case ‘*’ :

               printf(“ %.1lf * %.1lf : %.1lf”, a,b,a*b);

               break;

case ‘%’ :

               printf(“ %.1lf + %.1lf : %.1lf”, a,b,a%b);

               break;

default:

              printf(“error, The operator is not correct”);

              break;

}

getch();

}

The output will be like as follows…

Enter the operation: +, - , /, * , %  +

Enter the numbers 3 4

3.0 + 4.0 = 7.0