c - 数组和 scanf 问题；与 scanf 一起使用的值

Question

这是一个计算房间内人员年龄的简单程序。我正处于初始阶段，现在我看到我不知道哪些变量(我的意思是我在 scanf 之前声明的变量，然后是 scanf 中的占位符)用于 scanf；如何选择和应用正确的变量。是否有可以用简单的英语解释这些问题的资源？这是程序:

// Ages people by a year. Arrays

#include <stdio.h>

int main (void)
{
    // determine number of people
    int n;
    do
    {
        printf("Number of people in room: ");
        scanf ("%i", &n);
    }
    while (n<1); // get the number of people in the room, pass through user
                 // again and again until the user gives a positive integer

    // declare array in which to store everyone's age

    int ages[n];
    int  i;


    for (i = 0; i < n; i++)
    {
        printf("Age of person #%i: ", i + 1); // person number 1, person number 2, etc
        scanf ("%d", ages[i]); // store the age in the i-th part of the array ages
    }

    // report everyone's age a year hence
    printf("Time passes...\n\n");

    for (i = 0; i < n; i++)
    {
        printf(" A year from now person #%i will be %i years old.\n", i + 1, ages[i] + 1); 
        // we add 1 year to previous age

    }
 }

Answer 1

scanf("%d")期望一个地址作为参数。因此，替换

scanf ("%d", ages[i]);

与

scanf ("%d", ages + i);

(或 &ages[i] 但这是个人喜好。)