Question

Write a program to develop a calculator to carry 10 operations
(Bluej commands)

on two numbers. === Use arithmetic and relational operators

Answer 1

Answer:/*C program to design calculator with basic operations using switch.*/

#include <stdio.h>

int main()

{

   int num1,num2;

   float result;

   char ch;    //to store operator choice

   

   printf("Enter first number: ");

   scanf("%d",&num1);

   printf("Enter second number: ");

   scanf("%d",&num2);

   

   printf("Choose operation to perform (+,-,*,/,%): ");

   scanf(" %c",&ch);

   

   result=0;

   switch(ch)    

   {

       case '+':

           result=num1+num2;

           break;

           

       case '-':

           result=num1-num2;

           break;

       

       case '*':

           result=num1*num2;

           break;

           

       case '/':

           result=(float)num1/(float)num2;

           break;

           

       case '%':

           result=num1%num2;

           break;

       default:

           printf("Invalid operation.\n");

   }

   printf("Result: %d %c %d = %f\n",num1,ch,num2,result);

   return 0;

}

Output

   First run:

   Enter first number: 10

   Enter second number: 20

   Choose operation to perform (+,-,*,/,%): +

   Result: 10 + 20 = 30.000000

   Second run:

   Enter first number: 10

   Enter second number: 3

   Choose operation to perform (+,-,*,/,%): /

   Result: 10 / 3 = 3.333333

   Third run:

   Enter first number: 10

   Enter second number: 3

   Choose operation to perform (+,-,*,/,%): >

   Invalid operation.

   Result: 10 > 3 = 0.000000

Explanation: