Xcode 上的错误“没有匹配的函数调用‘max’”
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Error on Xcode "No matching function for call to 'max'"
提问by user3317815
This is the statement that I'm using but it says that no matching function for call to 'max'
这是我正在使用的语句，但它说没有匹配的函数来调用“max”
max((used_minutes-Included_Minutes)*extra_charge,0)
Any help would be appreciated.
任何帮助，将不胜感激。
EDIT
编辑
Code
代码
int used_minutes; const int Included_Minutes = 300;
double total_charge, extra_charge;
cout << "Enter the number of phone call minutes: ";
cin >> used_minutes;
cout <<"Number of phone call minutes used - included in the base plan: " << min(used_minutes,Included_Minutes) << endl;
cout <<"Number of phone call minutes used - not included in the base plan: "<< max(used_minutes-Included_Minutes,0) << endl;
extra_charge = 0.10;
cout <<"Cost of excess phone call minutes: $"<<fixed << setprecision(2) << max(used_minutes-Included_Minutes)*extra_charge, 0) <<endl;
回答by Peter R
max()requires that the first and second arguments are of the same type. extra_charge is a double which results in the first and second arguments having different type. Try:
max()要求第一个和第二个参数的类型相同。extra_charge 是一个双精度值，导致第一个和第二个参数具有不同的类型。尝试：
max((used_minutes-Included_Minutes)*extra_charge,0.0)
