c - 以下数组读取函数有什么问题？

Question

我在 Windows 7 上使用 Code::Blocks 编译器。它已经给了我几个问题，但从来没有像这个问题那么奇怪。我做了一个将数字上传到数组的函数。这是代码。

int array_read(float array[], const int max_index)
{
int converted, index=0;
char ch='a';

printf("\nEnter up to %d numbers.\n", max_index);

while((index<=max_index)&&(ch!='$'))
{
    label:printf("Enter element[%d] or $ if finished.\n", index);
    converted=scanf(" %f", &array[index]);
    ch=getchar();
    if ((converted!=1)&&(ch!='$'))
    {
        printf("Illegal character '%c'. Try again.\n", ch);
        goto label;
    }
    else
    {
        if (ch!='$')
        {
            printf("%f OK.\n", array[index]);
            index++;
        }

    }
}
index=index-1;
return index;
}

这不是一个很好的函数，但只要我输入“$”或索引达到最终数字，当我执行它时，它所做的就是不停地打印一个随机数。有任何想法吗？干杯!!!

Answer 1

没有发现你的函数有什么问题，我在 Linux 机器上用下面的代码块执行了你的代码并给了我预期的结果......

虽然我同意避免使用 GOTO

/* test.c */
#include<stdio.h>

int array_read(float array[], const int max_index)
{
int converted, index=0;
char ch='a';

printf("\nEnter up to %d numbers.\n", max_index);

while((index<=max_index)&&(ch!='$'))
{
    label:printf("Enter element[%d] or $ if finished.\n", index);
    converted=scanf(" %f", &array[index]);
    ch=getchar();
    if ((converted!=1)&&(ch!='$'))
    {
    printf("Illegal character '%c'. Try again.\n", ch);
    goto label;
    }
    else
    {
    if (ch!='$')
    {
        printf("%f OK.\n", array[index]);
        index++;
    }

    }
}
index=index-1;
return index;
}

int main()
{
  int i;
  float f[100];

  i = array_read(f,5);

  printf("return value is %d \n",i);

  return 0;
}

输出如下

$ gcc test.c # no compilation error
$ # for complete run entering all values till loop is over
$./a.out

Enter up to 5 numbers.
Enter element[0] or $ if finished.
2
2.000000 OK.
Enter element[1] or $ if finished.
0234.5
234.500000 OK.
Enter element[2] or $ if finished.
x23
Illegal character 'x'. Try again.
Enter element[2] or $ if finished.
23.000000 OK.
Enter element[3] or $ if finished.
d
Illegal character 'd'. Try again.
Enter element[3] or $ if finished.
-1
-1.000000 OK.
Enter element[4] or $ if finished.
234
234.000000 OK.
Enter element[5] or $ if finished.
7
7.000000 OK.
return value is 5
$

$ # terminating the loop by entering $ 
$ ./a.out

Enter up to 5 numbers.
Enter element[0] or $ if finished.
2
2.000000 OK.
Enter element[1] or $ if finished.
p
Illegal character 'p'. Try again.
Enter element[1] or $ if finished.
3
3.000000 OK.
Enter element[2] or $ if finished.
$
return value is 1