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  1. #include <stdio.h>
  2.  
  3. int findAverage(int a[], int n) {
  4.     int i, sum = 0;
  5.     double average;
  6.     for (i = 0; i < n; i++) {
  7.         sum += a[i];
  8.     }
  9.     average = (double)sum / n;
  10.     printf("平均值为：%.2f\n", average);
  11.  
  12.     // 检查平均值是否为整数
  13.     if (average != (int)average) {
  14.         return -1;
  15.     }
  16.  
  17.     int target = (int)average;
  18.     for (i = 0; i < n; i++) {
  19.         if (a[i] == target) {
  20.             return i;
  21.         }
  22.     }
  23.     return -1;
  24. }
  25.  
  26. int main(void) {
  27.     int n, a[10], result, i;
  28.  
  29.     printf("请输入数组元素个数：");
  30.     scanf("%d", &n);
  31.  
  32.     // 检查数组长度有效性
  33.     if (n <= 0 || n > 10) {
  34.         printf("元素个数必须在1到10之间。\n");
  35.         return 1;
  36.     }
  37.  
  38.     printf("请输入数组元素：");
  39.     for (i = 0; i < n; i++) {
  40.         scanf("%d", &a[i]);
  41.     }
  42.  
  43.     result = findAverage(a, n);
  44.     if (result == -1) {
  45.         printf("没有等于平均数的值\n");
  46.     } else {
  47.         printf("数列中等于平均数的数的下标是：%d\n", result);
  48.     }
  49.  
  50.     return 0;
  51. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
5
1 2 3 4 5
stdout 
请输入数组元素个数：请输入数组元素：平均值为：3.00
数列中等于平均数的数的下标是：2
https://ideone.com/Z5YOIf
language:
C (gcc 8.3)
created:
15 days ago
visibility:
public

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