Does Online GDB have any problems with string.h library?

void insertionSort( char *ptrArr[] )
{
    for( int i = 1; i < ROW; i   )
    {
        char *temp = ptrArr[i];
        int j;
        for( j = i - 1; j >= 0 && (strcmp(temp, ptrArr[j]) == -1); j-- )
            ptrArr[j   1] = ptrArr[j];
        ptrArr[j   1] = temp;
    }
}

The above code doesn't work in online GDB. There are no changes in output array of pointers sorting. But It works fine on my local compiler.

CodePudding user response：

Your comparison is wrong: instead of

(strcmp(temp, ptrArr[j]) == -1)

You should write

(strcmp(temp, ptrArr[j]) < 0)

Indeed, strcmp return a positive or negative value (or 0), not necessary -1 or 1 (or 0).

From man strcmp:

The strcmp() and strncmp() functions return an integer less than, equal to, or greater than zero if s1 (or the first n bytes thereof) is found, respectively, to be less than, to match, or be greater than s2.