Use C language to find isomorphic numbers from 1 to 1000

Please see examples for details:

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#include<stdio.h>
#include<stdlib.h>
#include<string.h>
char *right(char *ms,int len); /*截取一个字符串尾部长为len个字符的子串*/
void main()
{
long a;
int len;
char as[10];
char ms[20];
printf("求[1,10000]中的同构数：\n");
for(a=1;a<=10000;a++)
{
ultoa(a,as,10); /*数a转换为字符串，存入as*/
len=strlen(as);
ultoa(a*a,ms,10);
if(strcmp(as,right(ms,len))==0) /*比较字符串as与ms长为len的子串是否相等*/
printf("%s 其平方为 %s\n",as,ms); /*相等就是同构数，输出结果*/
}
system("pause");
}
char *right(char *ms,int len) /*截取字符串尾部长为len子串的函数*/
{
int i,j;
for(i=0;i<(signed)strlen(ms);ms++);
for(j=0;j<len;j++,ms--);
return ms;
}

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