这是个打任意空心长方形的程序,要求尽量简化,但是不能使用超出下边语句范围的语句,不能goto,只能whil/if
#include<stdio.h>
#include<windows.h>
int main()
{
    int x=0,y=0,i=1,j=1,k;
    printf("input chang (-1 to end):");
    scanf("%d",&x);   
    while(x!=-1){
       printf("input kuan :");
       scanf("%d",&y);
       while(i<=x){
             printf("*");
             ++i;}
       printf("\n");
       while(j<=y-2){
          printf("*");
          k=x-2;
          while(k!=0){
                      printf(" ");
                      k--;}
        printf("*");
        k=x-2;
        ++j;
        printf("\n");}
       i=1;j=1;
       while(i<=x){
             printf("*");
             ++i;}
       printf("\n");
       i=1;j=1;
       printf("input chang (-1 to end):");
       scanf("%d",&x);
       }  
    system("pause");
    return 0;}