如何拆分数字字符串，然后将其存储在c中的int数组中？

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I want to split a numeric string into separate numbers and then store each number in an integer array. For example we have this numeric string: 1 2 3 and I want the output to be:

arr[0] = 1
arr[1] = 2
arr[2] = 3

我正在使用strtok（）函数。 但是，下面的代码无法显示预期的结果：

int main()
{
    char b[] = "1 2 3 4 5";
    char *p = strtok(b," ");
    int init_size = strlen(b);
    int arr[init_size];
    int i = 0;

    while( p != NULL)
    {
       arr[i++] = p;
       p = strtok(NULL," ");
    }

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

return 0;
}