如何在阵列中存储argv命令行输入（C） [英] How do I store argv command line inputs in an array (C)

问题描述

尝试将argv命令行输入输入到数组中。

所有打印输出的是内存位置而不是argv输入



我尝试过：

Trying to input the argv command line inputs into an array.
All it's printing out is the memory location and not the argv inputs

What I have tried:

#define MAX 12

int main(int argc, char* argv[])
{
  char* argv_inputs[MAX];
  int array_of_ints[MAX];
  int i, size = argc;

  for(i = 2; i <= argc; i++)
  {
    argv_inputs[i] = argv[i];
    printf("%d ", argv_inputs[i]);
  }

推荐答案

您不需要 argv 输入数组但必须使用 atoi - C ++ Reference 将文本参数转换为数字[ ^ ]或 strtol - C ++参考 [ ^ ]：



You don't need a copy of the argv input array but have to convert the textual arguments to numbers using atoi - C++ Reference[^] or strtol - C++ Reference[^] :

int main(int argc, char* argv[])
{
    int array_of_ints[MAX];
    int i;
    
    for (i = 1; i < argc && i < MAX; i++)
    {
        array_of_ints[i] = atoi(argv[i]);
        printf("%d ", array_of_ints[i]);
    }
    return 0;
}

请注意，上面没有检查输入是否是有效数字并且我已经更正了循环。使用C / C ++，数组从索引零开始，因此最后一项由 size - 1 访问。



我还添加了一张支票，以确保不会发生越界访问。

[/ EDIT]

Note that the above does not check if the input is a valid number and that I have corrected the loop. With C/C++, arrays start at the index zero and the last item is therefore accessed by size - 1.

I have also added a check to ensure that no out-of-bound accesses occur.
[/EDIT]

输入是一个指向char的指针数组，并将它们分配给整数数组。这是行不通的：虽然指针是整数值（或64位应用程序中的长整数值，数字本身是没有意义的 - 它们是每个字符串中第一个字符的地址，所以当你打印它们时你得到的数字是完全没有意义。

试试这个：

The input is an array of pointer-to-char values, and you are assigning them to an array of integers. That won't work: while the pointers are integer values (or long integer values in a 64 bit application, the numbers themselves are meaningless - they are the addresses of the first character in each string, so when you print them you get numbers which make no sense at all.
Try this:

int main(int argc, char* argv[])
    {
    int i;
    for(i = 2; i < argc; i++)
        {
        printf("%s\n", argv[i]);
        }
    }

这将打印输入。

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