我当前的代码在 MS Visual Studio 中运行不正常？

Question

我今天正在为办公室做一个项目，但我今天遇到了一些意外。我的代码已正确调试，但它在运行时会忽略我设置的所有参数，并在一行可执行文件中一起粉碎（如果这有意义的话）。这是提示以及我目前所拥有的：

“企业需要计算销售代表的奖励积分。奖励积分基于每位销售代表当年的销售额。

编写一个程序，提示用户输入销售代表的销售额。为每组销售代表包括不同的职能。

将奖励积分显示为整数。

请参阅显示组、销售和奖励积分的表格：

团体销售奖励积分：

0 美元 - 100 美元，000 500 点

$100, 001 - $1,000,000 1, 500 分

B $1,000,001 - $2,000, 000 2,000 积分

$2,000,001 - $3,000, 000 2, 500 分

C $3,000,001 - $4,000, 000 3, 000 积分

$4,000,001 及超过 5,000 分

输入验证：不接受负数进行销售。”

这是我迄今为止尝试过的：

#include <iostream>
#include <iomanip>
using namespace std;
    
float salesamounts; //sales made 
int username; // Sales rep name
    
int main()
{
    cout << “Please enter your sales made for the year: $”
    cin >> salesamounts;
    cout << endl;

    // exception on program
    if (salesamounts <= -1);
    {
        if (salesamounts <= -1);
            cout << “Value cannot be negative. Please input again.”
    }
    
    // Group A placement
    for (;salesamount <= 100000;)
    {
        if ((salesamounts <= 100000) 
        cout << “Congratulations! You earned 500 Bonus Points!”
    
        break;
    {
    
    for (; salesamounts > 100001 < 1000000;)
    { 
        if ((salesamounts > 100001 < 1000000));
            cout << “Congrats! 10000 Bonus Points have been credited to you!”
    
        break;
    }

Answer 1

根据您的要求，您可以使用if-elseif-else来判断每组销售代表，如：

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
   double salesamounts; //sales made 

   int username; // Sales rep name

   cout << "Please enter your sales made for the year : $" << endl;

   
   while (cin >> salesamounts) {
          // exception on program
          if (salesamounts < 0.0) {
                 cout << "Value cannot be negative.Please input again." << endl;
          }

          //judge salesamounts
          else if (salesamounts>0.0 && salesamounts <= 100000.0) {
                 cout << "Congratulations!You earned 500 Bonus Points!" << endl;
          }
          else if (salesamounts > 100000.0 && salesamounts <= 1000000.0) {
                 cout << "Congrats!1500 Bonus Points have been credited to you!" << endl;
          }
          else if (salesamounts > 1000000.0 && salesamounts <= 2000000.0) {
                 cout << "Congrats!2,000 Bonus Points have been credited to you!" << endl;
          }
          else if (salesamounts > 2000000.0 && salesamounts <= 3000000.0) {
                 cout << "Congrats!2,500 Bonus Points have been credited to you!" << endl;
          }
          else if (salesamounts > 3000000.0 && salesamounts <= 4000000.0) {
                 cout << "Congrats!3,000 Bonus Points have been credited to you!" << endl;
          }
          else if (salesamounts > 4000000.0 ) {
                 cout << "Congrats!5,000 Bonus Points have been credited to you!" << endl;
          }
          else {
                 break;
          }
     }
}

顺便说一句，您也可以使用switch statement 来执行此操作。

Answer 2

您输入部分几乎正确，但之后您将if-else-if 部分与for 循环混淆了。

在获取用户输入时，您可以使用 while 循环来检查该值是否为负数。如果输入的值不符合条件，这将使程序提示用户再次输入值：

float salesamounts;
cout<<"Enter the sales amounts for the year:";   //the program will prompt the user initially
cin>>salesamounts;   //user inputs the value here
while(salesamounts<0)   //this line checks if the value is negative, if yes, it'll continue running this block till the value is non-negative
{
    cout<<"Negative numbers not allowed. Please enter again: ";   //Suppose the value is negative. Then the program will display this line and prompt the user to enter again
    cin>>salesamounts;   //user enters the value again
}

程序的下一步是检查用户输入并让程序采取相应措施。 if-else 语句将完美地做到这一点：

if (salesamount<=100000)   //checks the value. If this is true, then then the following line will run. Else, the program will move to the next check.
cout<<"Bonus point is 500";   //displays the output if the above condition is correct
else if (salesamount<=1000000)   //second check
cout<<"Bonus point is 1500";   //displays if the second condition is true
.
.
.
else
cout<<"Bonus point is 5000";

等等。

澄清一下，循环仅在您希望特定代码块重复运行时使用，而要检查或比较两个值，则使用 if-else 声明。

请注意我没有将第二次检查写为if (salesamounts>=100001 && salesamounts<=1000000)，而且我将最后一次检查写为else，而不是else if。