Basic Command Line Calculator source in C

/*
===================================
Program: Calculate version 1.0
Author: Manish Raj
Website: http://www.technoslab.in/
Description: Simple CLI calculator for beginners
===================================
*/

/* Include header files */
#include <stdio.h>
#include <conio.h>

/* Begin main method */
int main(){

    /* Display program information */
    printf("\nCalculate v1 by Manish");

    /* Declare variables */
    char cmd, oprt;
    int num1, num2;

    /* Loop infinitely till 'x' is pressed */
    while(1){

        /* Initialize variables to default value on each iteration */
        cmd = '?';
        oprt = '?';
        num1 = 0;
        num2 = 0;

        /* Ask user for action to be performed */
        printf("\nPress x to exit, Press c to calculate: ");
        cmd = getch();
        if(cmd == 'X' || cmd == 'x'){

            /* If 'x' was pressed -> exit */
            printf("%c", cmd);
            break;
        }
        else if(cmd == 'c' || cmd == 'C'){

            /* If 'c' was pressed -> calculate */
            printf("%c", cmd);

            /* Display instructions */
            printf("\nEnter expression in this form - number1 operator number2.\nAllowed operators: + , -, *, /, %.\nExample: 2 + 2\nEnter now:");
            scanf("%d %c %d", &num1, &oprt, &num2);

            /* Begin calculation */
            switch(oprt){
                case '+' :
                    printf("%d %c %d = %d", num1, oprt, num2, num1 + num2);
                    break;
                case '-' :
                    printf("%d %c %d = %d", num1, oprt, num2, num1 - num2);
                    break;
                case '*' :
                    printf("%d %c %d = %d", num1, oprt, num2, num1 * num2);
                    break;
                case '/' :
                    if( num2 == 0){
                        printf("%d %c %d = Math Error. You can not divide any number by 0", num1, oprt, num2);
                    }else{
                        printf("%d %c %d = %d", num1, oprt, num2, num1 / num2);
                    }
                    break;
                case '%' :
                    printf("%d %c %d = %d", num1, oprt, num2, num1 % num2);
                    break;
                default:
                    printf("Invalid expression. Operator %c is not allowed. Try again!", oprt);
                    break;
            }
        }else{

            /* Display error */
            printf("\nInvalid selection. Try again!");
        }
    }

    /* Display exit message */
    printf("\nThank you for using the program.");

    /* Return 0 to OS */
    return 0;
}