How to make a simple Calculator using C(__Switch-command___)

 MAKING A SIMPLE CALCULATOR 

SWITCH-COMMAND

       

                 

" It uses where many choices are available and only one should be executed"

 SYNTAX:

 

     switch(epression)

 {

case 1:

statement 1;

break;

case 2:

statement 2;

break;

case n:

statement n;

break;

default:

statements;

    } 

       Cases:

                 A switch statement compares the result of a single expression with multiple cases.

                    Statements: 

                              These are the input and output commands e.g. printf() or scanf().

                 Break:

                           It is used in each case label and is used to exit from the switch body. If it, not use then cases that come after the match case will also be executed.

               Default:

                         It uses at the end of the switch body and it will execute when the result of the expression does not match with any case label.

                                    "PROGRAM OF CALCULATOR"

#include<stdio.h>

#include<conio.h>

main()

{

     int a,b;

     float c;

  char op;

clrscr();

printf("Enter first number, operetor and second number");

scanf("%d%c%d",&a,&op,&b);

if(op=='+'||op=='-'||op=='*'||op=='/'||op=='%')

{

switch(op)

{

case'+':

printf("%d+%d=%d",a,b,a+b);

break;

case'-':

printf("%d-%d=%d",a,b,a-b);

break;

case'*':

printf("%d*%d=%d",a,b,a*b);

break;

case'/':

printf("%d/%d=%d",a,b,a/b);

break;

case'%';

printf("%d % %d=%d",a,b,a%b);

break;

  printf("Invalid operator");

                 }