Source code of simple calculator that performs addition, subtraction, multiplication and division operations. So lets start.😃

What is switch case? For what it is used for? Understand with example by going through this link. Also understand how many types of decision making statements are present in C programming language.


// Program for calculator

#include<stdio.h>
#include<conio.h>

void main()
    {
      int a,b,add,sub;
      float c,d,multiply,divide;
      clrscr();

      printf("Enter which operation you want to perform");
      printf("\n 1.Addition \n 2.Subtraction \n 3.Multiplication \n 4.Division \n");
      int option;
      printf("Enter your choice :: ");
      scanf("%d",&option);
    switch(option)
    {
      case 1:
       printf("\nEnter the numbers: ");
       scanf("%d \t %d",&a,&b);
       add=a+b;
       printf("%d",add);
       break;
      case 2:
       printf("\nEnter the numbers: ");
       scanf("%d \t %d",&a,&b);
       sub=a-b;
       printf("%d",sub);
       break;
      case 3:
       printf("\n Enter the numbers: ");
       scanf("%f \t %f",&c,&d);
       multiply=c*d;
       printf("%f",multiply);
       break;
      case 4:
       printf("\n Enter the numbers: ");
       scanf("%f \t %f",&c,&d);
       divide=c/d;
       printf("%f",divide);
       break;
      default:
       printf("Invalid choice");
       break;
      }
      getch();
    }