ah love! could you and i with fate conspire

to grasp this sorry scheme of things entire,

would not we shatter it to bits--and then

re-mould it nearer to the heart's desire!

产生如下输出:

ah love! could you and i with fate conspire

would not we shatter it to bits--and then

re-mould it nearer to the heart's desire!

这个程序可以清楚的分成三部分:

while(还有未处理的行)

     if(该行包含指定的模式)

                   打印该行

#include  <stdio.h>
#define MAXLINE 100   /*最大输入行长度*/

int getline (char line[],int max);
int strindex(char source[],char searchfor[]);

char pattern[]="ould";    /*要查找的模式*/

/*找出所有与模式匹配的行*/
main()
{
    char line[MAXLINE];
    int found=0;

    while (getline(line,MAXLINE)>0)
        if (strindex(line,pattern)>=0)
        {
            printf("%s",line);
            found++;
        }
        return found;
}

/*getline:取一行放到s中,并返回该行的长度*/
int getline(char s[],int lim)
{
    int c,i;
    i=0;
    while(--lim>0&&(c=getchar())!=EOF&&c!='\n')
        s[i++]=c;
    if (c=='\n')
        s[i++]=c;
    s[i]='\0';
    return i;
}

/*strindex:返回t在s中的位置,若未找到则返回-1*/
int strindex(char s[],char t[])
{
    int i,j,k;
    for (i=0;s[i]!='\0';i++)
    {
        for (j=i,k=0;t[k]!='\0'&&s[j]==t[k];j++,k++)
            ;
        if(k>0&&t[k]=='\0')
            return i;
    }
    return -1;
}

 

posted on 2013-06-05 10:42  欧小弟  阅读(231)  评论(0编辑  收藏  举报