20140723 字符串包含程序

1、字符串包含程序

#include<stdio.h>
#include<string.h>
int Strstr(char *String, char *Substring)
{
    if(String==NULL||Substring==NULL||strlen(String)<strlen(Substring))
        return -1;

    char *pString=String;
    char *pSubstring=Substring;
    int count=0;
    while(*pString!='\0')
    {
        pSubstring=Substring;
        while(*pSubstring==*pString)
        {
            pString++;
            pSubstring++;
            if(*pSubstring=='\0')
                return count;
        }
        pString++;
        count++;
    }
}

void main()
{
    char Str[]="ABCD";
    char Substr[]="ABCDEEE";
    int index=Strstr(Str,Substr);
    printf("%d",index);
}