Question

Hello everybody, I m a newbie and I m doing a code that the principal aim is to print a number if two strings are equal. First string is obtained from a file and the second one is the string to be compared with.

代码:

int main()
{
char *string[2];
FILE *stream;
stream = fopen("REL","r");
if( (stream = fopen("REL","r")) == NULL)
{  
    printf("Can t open %s
","REL");
    exit(1);
}
for(int i=0;i<92;i++)
{
    fscanf(stream,"%s",&string);
    if( strcmp("20", *string) == 0 )
    {
        printf("%d",20);
    }
}
fclose(stream);
}

当我在贝壳上做测试时, 它会加速我:

~/CM$ ./file2 
Segmentation fault (core dumped)

我可能犯了一个愚蠢的错误,但是,作为一个新人,我不明白剧本出了什么问题。

Answer 1

stringing 是一个2 char__/code> 的单位化阵列。 fscanf 正试图写到内存中不应该写的地方。声明 string 是一个字符阵列:



char string[256];


并且:

fscanf(stream, "%255s", string); /* Limit number of
                                    chars read to prevent buffer overrun. */

Answer 2

尝试此 :

char string[128];
fscanf(stream, "%s", string);

然后:

if (!strcmp("20", string)) {
    /* The strings are equals */
}

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