函数不需要1个参数c ++ [英] function does not take 1 arguments c++

问题描述

我的代码存在问题，因为我无法弄清楚为什么我收到错误。这里是代码：

  using namespace std; 
 
 void presentValue（）; 
 bool stringChar（）; 
 bool stringVal（）; 
 double futureValConv（）; 
 
 int main（）
 {
 cout<< 欢迎使用现值利息计算器！\\\\首先，让我收集一些数据。<< endl<< endl; 
 presentValue（）; 
 return 0; 
 
 $ b $ void presentValue（）
 {
 //声明变量
 //响应初始化为x，用于调试
 char响应= 'x'; 
 
 while（response！='n'|| response！='N'）
 {
 //声明变量
 double intRate = 0 ; 
 string futureValString; 
 double futureVal; 
 double year = 0; 
 
 //简单现值方程
 double presentVal = futureVal / pow（（ intRate + 1），年）; 
 
 cout<<你的利率是多少？ ; 
 cin>> intRate; 
 cout<<确定，您期望的未来值是什么？ [H} elp; 
 cin>> futureVal; 
 //运行递减帮助程序，不允许没有双值转义
 ** futureVal = futureValConv（futureValString）; ** 
 cout <<< lt lt endl lt lt endl <<最后，您想节省多少钱？ ; 
 cin>>年; 
 cout<< endl<<您已经做到了这一点!!!; 
 cout<< endl << endl< presentVal; 
 
} 
} 
 inline double futureValConv（string somestring）
 {
 // delcare变量
 double newString = 0; 
 
 ** if（stringChar（somestring））** 
 {
 cout< endl<<未来值是您希望将来在您的账户中拥有的金额。@ $ n; 
 cout<<这可能是多少？ ; 
 cin>> somestring; 
 futureValConv（somestring）; 
 
 
 ** else if（stringVal（somestring））** 
 {
 //将未来价值字符串转换为未来使用的双倍
 newString = atoi（somestring.c_str（））; 
} 
 else 
 {
 cout<<请输入一个合适的值。 ; 
 futureValConv（somestring）; 
} 
 
 return newString; 
} 
 
 bool stringChar（字符串响应）
 {
 //声明变量
 char answer = response [0]; 
 bool status = false; 
 
 if（answer =='H'|| answer = ='h'）
 {
 status = true; 
返回状态; 
} 
} 
 
 bool stringVal（字符串响应）
 
 // declare varialbes 
 int answer = atoi（response.c_str（））; 
 bool status = false; 
 int powZero =（answer，0）; 
 
 if（powZero == 1）
 {
 status = true; 
 return status; 
} 
 
} 
  

我发布了大部分代码，因为我无法理解这里发生了什么，它告诉我那stringChar和stringVal不带1个参数，以及futureValConv。我试图运行一个函数检查一个字符串的值，并在做出决定之前确定它的值。实例中，函数调用自己再次运行，直到用户输入一个可接受的double（我通过运行0的幂来检查1的回答来检查）。我用粗体显示了产生错误的三条线。有趣的是，即使通过注释函数futureValConv并且从不调用其他函数，我仍然会得到两个错误。

>你在顶部声明：

  bool stringChar（）; 
 bool stringVal（）; 
  

所以编译器期望stringChar和stringVal函数没有参数。
将声明更改为：

  bool stringChar（string response）; 
 bool stringVal（string response）; 
  

I'm having issue with my code, in that I can't figure out why I'm receiving an error. Here is the code:

using namespace std;

void presentValue();
bool stringChar();
bool stringVal();
double futureValConv();

int main()
{
  cout << "Welcome to the Present Value Interest Calculator!\n\"First, let me collect some data." << endl << endl;
  presentValue();
  return 0;
}

void presentValue()
{
  //declare variables
  //Response value intialized as x for debugging
  char response = 'x';

  while (response != 'n' || response != 'N')
  {
    //declare variables
    double intRate = 0;
    string futureValString;
    double futureVal;
    double years = 0;

    //Simple present value equation
    double presentVal = futureVal / pow((intRate + 1), years);

    cout << "What's your Interest Rate?  ";
    cin >> intRate;
    cout << "OK, and what's your desired Future Value? [H}elp  ";
    cin >> futureVal;
    //Run descending help program that won't allow escape without a double value
    **futureVal = futureValConv(futureValString);**
    cout << endl << endl << "And finally, how many years would you like to save your money for?  ";
    cin >> years;
    cout << endl << "You've made it this far!!!";
    cout << endl << endl << presentVal;

  }
}
inline double futureValConv(string somestring)
{
  //delcare variables
  double newString = 0;

  **if (stringChar(somestring))**
  {
    cout << endl << "Future Value is the amount you would like to have in your account in the future.\n\n";
    cout << "How much might that be?  ";
    cin >> somestring;
    futureValConv(somestring);

  }
  **else if(stringVal(somestring))**
  {
    //Convert the Future Value String to a double for future use
    newString = atoi(somestring.c_str());
  }  
  else
  {
    cout << "Please enter a proper value.  ";
    futureValConv(somestring);
  }

  return newString;
}

bool stringChar(string response)
{
  //declare variables
  char answer = response[0];
  bool status = false;

  if (answer == 'H' || answer == 'h')
  {
    status = true;
    return status;
  }
}

bool stringVal(string response)
{
  //declare varialbes
  int answer = atoi(response.c_str());
  bool status = false;
  int powZero = (answer, 0);

  if (powZero == 1)
  {
    status = true;
    return status;
  }

}

I posted most of my code because I can't grasp what is going on here. It is telling me that stringChar and stringVal do not take 1 arguments, as well as futureValConv. I am attempting to run a function checking the value of a string, and determining what the value is before making a decision. In two of the three instances, the function calls itself to run again until the user has entered an acceptable double (Which I check by running to the power of 0 for a an answer of 1.) I have bolded the three lines generating an error. Interestingly, even by commenting out the function futureValConv and never calling into the other functions, I still get two of the three errors.

解决方案

You declared this at the top:

bool stringChar();
bool stringVal();

So the compiler expects stringChar and stringVal functions to have no arguments. Change the declaration to:

bool stringChar(string response);
bool stringVal(string response);

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