c++ - 如何将变量添加到其当前值，以及随后的用户输入？

Question

我正在使用 switch 语句来存储用户输入的值。如果用户选择了某种情况，他们会询问一个数字并将该值存储在一个变量中。如果用户选择了相同的案例怎么办，您如何将该值添加到当前值。我试图将第一个值存储在 activity_count 中，然后将该值保存到 activity_counts。然后添加activity_counts 但是这个值一直在变化，随着循环不断更新。我知道我的逻辑是错误的，有人可以让我更好地了解我需要做什么吗？

这是我的代码

for(daily_count = 0; daily_count < patient_count; daily_count++){
   int options;
   int activity_count;
   int activity_counts;

   cout << "1. Wash_Hands\n";
   cout << "9. Exit\n";

   cout << "\n";
   cout << "Choose a number with a description, which best decribes patient's obsessive activities: ";
   cin >> options;
   cout << "\n";


   switch(options){
       case 1:
           cout << "How much times did " << patient_name << " wash his hair:";
           cin >> activity_count;
           if(activity_count != 0)
                activity_counts = activity_count;
                activity_counts += activity_counts;
                cout << activity_counts << "\n\n";
                break;
       default:
            exit(0);
    }
}

Answer 1

你的代码还有更多问题:

       if (activity_count != 0)
            activity_counts = activity_count;
            activity_counts += activity_counts;
            cout << activity_counts << "\n\n";
            break;

只有 if 之后的第一个语句被条件触及，其他总是执行(可能缺少大括号 { 和 } )

       if (activity_count != 0)

这似乎没用 - 加零有什么问题？

            activity_counts = activity_count;

这有效地覆盖 activity_counts - 这是你的意思吗？

            activity_counts += activity_counts;

通过向其添加相同的值，它加倍 activity_counts - 是这个意思吗？

So, my friend, your code probably needs at least these 2 changes:

更改 1:Inicialize activity_counts 为 0 和 move for 循环前面的声明 - 使用

int activity_counts = 0;

for (daily_count = 0; daily_count < patient_count; daily_count++){
    int options;
    int activity_count;

用未初始化声明代替这部分代码(产生一个 随机值 for 循环中的声明变量):

for (daily_count = 0; daily_count < patient_count; daily_count++){
    int options;
    int activity_count;
    int activity_counts;

改变 2:代替行

       if (activity_count != 0)
            activity_counts = activity_count;
            activity_counts += activity_counts;

简单使用

            activity_counts += activity_count;

(注意左边是复数，右边是单数。)