simulate a simple calculator

/* Write a C program to simulate a simple calculator to perform *
* arithmetic operations like addition, subtraction,multiplication *
* and division only on integers. Error message should be repoetrd *
* if any attempt is made to divide by zero */

#include stdio.h
#include conio.h

void main()
{
char oper; /* oper is an operator to be selected */
float n1, n2, result;

clrscr();

printf ("Simulation of a Simple Calculator\n\n");

printf("Enter two numbers\n");
scanf ("%f %f", &n1, &n2);

fflush (stdin);

printf("Enter the operator [+,-,*,/]\n");
scanf ("%c", &oper);


switch (oper)
{
case '+': result = n1 + n2;
break;
case '-': result = n1 - n2;
break;
case '*': result = n1 * n2;
break;
case '/': result = n1 / n2;
break;
default : printf ("Error in operation\n");
break;
}

printf ("\n%5.2f %c %5.2f= %5.2f\n", n1,oper, n2, result);

}
/*-----------------------------
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


------------------------------*/

This program is a command line calculator. This uses as the input of necessary operation as a string input and uses a case statement to execute the necessary arthematic equation. If a wrong operator is given then the error ms is displayed.