c - 我正在尝试从由制表符分隔的文本文件中获取数据。但我无法得到结果

Question

这是我的代码

#include <stdio.h>
#include <string.h>

main() {

    FILE *fp;
    char buff[1024];
    char q1[6];
    char q2[6];
    char * pch;
    int i;

    fp = fopen("QFile.txt", "r");
    fgets(buff, 255, (FILE*)fp);
    pch = strtok (buff,"\t");
    int count=0;
    while (pch != NULL)
    {
        q1[0]=("%s",*pch);
        pch = strtok (NULL, "\t");
    }

    fgets(buff, 255, (FILE*)fp);
    pch = strtok (buff,"\t");
    count=0;
    while (pch != NULL)
    {
        q2[0]=("%s",*pch);
        pch = strtok (NULL, "\t");
    }
    for(i=0;i<6;i++)
        printf ("%s\n",q1[i]);

    for(i=0;i<6;i++)
        printf ("%s\n",q2[i]);

    fclose(fp);
}

这是我的 QFile.txt 看起来像:

1   20 % of 2 is equal to   1)1 2)0.4   3)0.5   2
2   If Logx (1 / 8) = - 3 / 2, then x is equal to   1)-4    2)4 3)1/4   2

当我编译时，它会显示一些警告:

test3.c:4:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
 main() {
 ^

test3.c: In function ‘main’:
test3.c:32:10: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=]
  printf ("%s\n",q1[i]);
          ^

test3.c:35:10: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=]
  printf ("%s\n",q2[i]);
          ^

我不知道如何纠正这个问题。我想向两个数组提出两个 mcq 问题。我该如何解决这个问题？

Answer 1

test3.c:4:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
main() {
^

main() 默认返回 int。写

int main() { 

并返回一个 int, 0 告诉调用者一切正常

   return 0; // final line of main
}

test3.c: In function ‘main’:
test3.c:32:10: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=]
  printf ("%s\n",q1[i]);
      ^

test3.c:35:10: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=]
  printf ("%s\n",q2[i]);
          ^

q1 和 q2 是 char 数组，因此 qx[y] 给出这些数组的第 (y+1) 个元素，即一个字符。

如果您确实想打印位置 i 处的字符，请使用 %c (字符被转换为 int，因此会出现警告 int)

  printf ("%c\n",q1[i]);
  printf ("%c\n",q2[i]);