#include <stdio.h> // for output


int main () // execution starts here
{

   printf("Who will enter the number(or string) first? If Mr. X wants to enter first, press 1; if Y wants to enter first, press 2\n");
   // this is a comment
   // /n means new line
   int reply;
   int xNum, yNum;
   scanf("%d", &reply);
   // &reply means the address of reply
   if (reply==1)
   {
   printf("Welcome Mr. X, Please enter a number\n");
   scanf("%d", &xNum); // %d means format as decimal number
   printf("Welcome Mr. Y, Please enter a number\n");
   scanf("%d", &yNum);
   }
   else // in fact anything but 1
   {
   printf("Welcome Mr. Y, Please enter a number\n");
   scanf("%d", &yNum);
   printf("Welcome Mr. X, Please enter a number\n");
   scanf("%d", &xNum);
   }
   printf("Mr. X entered %d and Mr Y %d\n",xNum,yNum);
    return 0;
}