这个程序是干啥的，有啥功能

#include <stdio.h>
int main(void)
unsigned int x;
unsigned int y;
// prompt user for input
printf("%s","Enter two unsigned integers in the range 1-20:");
scanf("%u%u", &x, &y);// read values for xand y
for (unsigned int i e 1; i <e y;++i){ // count from 1 to y
printf("%s","@");
for (unsigned int j _ 1;j<= x;++j){ // count from 1 to x
puts("");// begin new 1ine
nvion

输入两个数x y，打印x个@，y个星号吧（星号被屏蔽）