新手简单的 改写 问题

[huanhuan30]

例子1.。。。。。

#include <stdio.h>
#include <stdlib.h>
#define SIZE 256
int has_ch (char ch, const char *temp);
int main (int argc, char *argv[])
{
	FILE *fp;
	char temp[SIZE];
	int i = 0;
	char ch = argv[1][0];
	if (argc != 3)
	{
		printf("filename s1 s2.....\n");
		exit(1);
	}
	else
	{
		if ((fp = fopen(argv[2], "r")) == NULL)
		{
			printf("Can't open %s \n", argv[1]);
			exit(2);
		}
		while (fgets(temp, SIZE, fp) != NULL)   
		{
			if (has_ch(ch, temp))
			{
				fputs(temp, stdout);
			}
		}
	}
	fclose(fp);
	return 0;
}
int has_ch (char ch, const char *line)
{
    int i = 0;
	while (line[i] != '\0')
	{
		if (ch == line[i])
		{
			return (1);
		}
		i++;
	}
	return 0;
}

例子2.。。。。。

#include <stdio.h>
#include <stdlib.h>
#define SIZE 256
int main (int argc, char *argv[])
{
	FILE *fp;
	char temp[SIZE];
	int i = 0;
	char ch = argv[1][0];
	if (argc != 3)
	{
		printf("filename s1 s2.....\n");
		exit(1);
	}
	else
	{
		if ((fp = fopen(argv[2], "r")) == NULL)
		{
			printf("Can't open %s \n", argv[1]);
			exit(2);
		}
		while (fgets(temp, SIZE, fp) != NULL)   
		{
			
                        while (temp[i] != '\0')
			{
				if (temp[i] == ch)
				{
					fputs(temp, stdout);
					i = 0;
					break;
				}
				i++;
			}
			
		}
	}
	fclose(fp);
	return 0;
}

例子1 为什么 不能 用 例子2 改写。。。。哪里错了。。。。。

[hhyttppd]

查找之前要重置
i = 0;
while (temp[i] != '\0')
...

[xiaoyisnail]

#include <stdio.h>
#include <stdlib.h>
#define SIZE 256
int main (int argc, char *argv[])
{
    FILE *fp;
    char temp[SIZE];
    int i = 0;
    char ch = argv[1][0];
    if (argc != 3)
    {
        printf("filename s1 s2.....\n");
        exit(1);
    }
    else
    {
        if ((fp = fopen(argv[2], "r")) == NULL)
        {
            printf("Can't open %s \n", argv[1]);
            exit(2);
        }
        while (fgets(temp, SIZE, fp) != NULL)   
        {
            i=0;
            while (temp[i] != '\0')
            {
                if (temp[i] == ch)
                {
                    fputs(temp, stdout);
                    i = 0;
                    break;
                }
                i++;
            }
            
        }
    }
    fclose(fp);
    return 0;
}