为什么strcmp返回-1？

Question

#include <stdio.h>
#include <stdlib.h>

char passage[5000][20];
char *getword(int i);

int main(){
    passage[0][0] = 'a';
    passage[0][1] = 'm';
    passage[0][2] = '\0';
    printf("%s\n", getword(0));
    char *word = getword(0);
    printf("%d", strcmp(word,"am"));
    return 0;
}

char *getword(int i){             //get a word from passage
    int a=0;
    static char words[20];
    while (passage[i][a] != ' '){
        words[a] = passage[i][a];
        a++;
        //printf("%c\n",words[a]);
    }

    words[a] = '\0';

    return words;
}

我计划通过从{2} function获取string并将string与某个词进行比较，为array进行比较string 。为什么strcmp返回-1？它应该是相同的还是考虑null？

Answer 1

while (passage[i][a] != '\0'){

将此更改为

number

Answer 2

• string equal return 0

• 第一个字符串是更高的返回1

• 第二个字符串是更大的返回-1