指针的简单应用

题目：http://acm.swust.edu.cn/oj/problem/448/

在本题中我实现了用指针读入字符串的功能。

并通过指针的操作来实现本题的功能。

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int main(){
    char *str, *p;
    char *sen, *sp;
    char ch;
    p = (char *)malloc(sizeof(char));
    str = p;
    while(scanf("%c", &ch)!=EOF){
        if(ch=='\n') break;
        *p = ch;
        p++;
    }
    sp = (char*)malloc(sizeof(char));
    sen = sp;
    while(scanf("%c", &ch)!=EOF){
        if(ch=='\n') break;
        *sp = ch;
        sp++;
    }
    int i, j, Lens = strlen(sen), Lenw = strlen(str), pos;
    p = str;
    sp = sen;
    char *ssp;
    for(i=0; i<Lens; i++){
        if(*sp==*p){
            ssp = sp;
            pos = i+1;
            for(j=1; j<Lenw; j++){
                sp++;
                p++;
                if(*sp!=*p) break;
            }
            if(j==Lenw-1){
                break;
            }else{
                sp = ssp;
                p = str;
            }
        }
        sp++;
    }
    printf("%d\n", pos);
}