/*有一个字符串，包含n个字符。编写一个函数，将此字符串中从第m个字符开始的全部字符复制成为另一个字符串。*/
#include<stdio.h>
#include<string.h>
#define N 20
void copystr(char *,char *,int);
void main()
{
    int m;
    char str1[N];
    char str2[N];
    printf("Please input str1:\n");
    gets(str1);
    printf("Which charter that begin to copy?");
    scanf("&d",&m);
    if(strlen(str1)<m)
   
        printf("input error!!!\n");
        //printf("Please input again:");
        //scanf("%d",&m);
   
    else
    {
        copystr(str1,str2,m);
        printf("the result is:\n%s\n",str2);
    }
}

void copystr(char *p1,char *p2,int m)
{
    int n;
    n=0;
    while(n<m-1)
    {
        n++;
        p1++;
    }
    while(*p1!='\0')
    {
        *p2=*p1;
        p1++;
        p2++;
    }
    *p2='\0';
}


编译没错，结果错误！