C program for addition subtraction multiplication and division using switch case

• Write a C program to simulate a simple calculator to perform arithmetic operations like a and division only on integers. Error message should be reported if any attempt is made to divide by zero    
• C program for addition subtraction multiplication and division using switch case
• Write a c program to perform arithmetic operations using switch case
• C program to add subtract multiply and divide two numbers using functions

Program #1: Write a c program to perform arithmetic operations using switch case

1. #include <stdio.h>
2. #include <conio.h>
3.  
4. int main()
5. {
6.     char oper;            /* oper is an operator to be selected */
7.     float n1, n2, result;
9.  
10.     printf ("Simulation of a Simple Calculator\n\n");
11.  
12.     printf("Enter two numbers\n");
13.     scanf ("%f %f", &n1, &n2);
14.  
15.     fflush (stdin);
16.  
17.     printf("Enter the operator [+,-,*,/]\n");
18.     scanf ("%c", &oper);
20.  
21.     switch (oper)
22.        {
23.         case '+': result = n1 + n2;
24.               break;
25.         case '-': result = n1 - n2;
26.               break;
27.         case '*': result = n1 * n2;
28.               break;
29.         case '/': result = n1 / n2;
30.               break;
31.         default : printf ("Error in operation\n");
32.               break;
33.     }
34.  
35.     printf ("\n%5.2f %c %5.2f= %5.2f\n", n1,oper, n2, result);
36. getch();
37. }

Output:

• Output
  Simulation of Simple Calculator
  
  Enter two numbers
  3 5
  Enter the operator [+,-,*,/]
  +
  
   3.00 +  5.00=  8.00
   
• RUN2
  Simulation of Simple Calculator
  
  Enter two numbers
  12.75
  8.45
  Enter the operator [+,-,*,/]
  -
  
  12.75 -  8.45=  4.30
• RUN3
  Simulation of Simple Calculator
  
  Enter two numbers
  12 12
  Enter the operator [+,-,*,/]
  *
  
  12.00 * 12.00= 144.00
   
• RUN4
  Simulation of Simple Calculator
  
  Enter two numbers
  5
  9
  Enter the operator [+,-,*,/]
  /
  
   5.00 /  9.00=  0.56