第四章-函数与程序结构

4.1

#include <stdio.h>
#define MAXLINE 1000
int add_getline(char line[], int max);
int strindex(char source[], char searchfor[]);

char pattern[] = "ray";

int main(void)
{
    char line[MAXLINE];
    int found = 0;

    while(add_getline(line, MAXLINE) > 0){
        printf("run here1\n");
        if(strindex(line, pattern) >= 0){
            printf("%s", line);
            found++;
        printf("run here2\n");
        }
    }
    return found;
}

int add_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‘;
    printf("run here3 i:%d\n", i);
    return i;
}

int strindex(char s[], char t[])
{
    int i, j, k;
    printf("run here4\n");
    for(i = 0; s[i] != ‘\0‘; i++){
        printf("run here5\n");
        for(j=i, k=0; t[k]!=‘\0‘ && s[j]==t[k]; j++, k++)
            printf("s[%d]=%c, t[%d]=%c\n", j,s[j],k, t[k]);
        if(k > 0 && t[k] == ‘\0‘){
            printf("k:%d\n",k);
            return i;
        }
    }
    printf("run here6\n");
    return -1;
}