C++函数返回值存储变量问题

Question

我正在尝试使用 UserPrompt 函数的返回值存储 numofterms，但除了输入参数的 double 值之外，它一直在寻找字符串。有什么办法可以解决这个问题吗？

const string PROGDESCRIPTION = "Program will approximate the natural logarithm of 2 ";

double UserPrompt(string prompt, double terms)
{


    cout << prompt;
    cin >> terms;

    while(terms <= 0)
    {
        cout << "ERROR - Input must be positive and non-zero! Please Try again. ";
    }
    return terms;
}
int main()
{

double numofterms;

cout << PROGDESCRIPTION << endl << endl << endl;

UserPrompt("Enter the number of terms to compute: ", numofterms); 

numofterms = UserPrompt(numofterms); 
cout << numofterms;

}

Answer 1

改变这个:

double UserPrompt(string prompt, double terms)
{

对此:

double UserPrompt(string prompt)
{
    double terms;

还有这个:

UserPrompt("Enter the number of terms to compute: ", numofterms);
numofterms = UserPrompt(numofterms);

对此:

numofterms = UserPrompt("Enter the number of terms to compute: ");