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[英]error: no match for 'operator+=' (operand types are 'long double' and 'std::__cxx11::basic_string<char>')
[英]How do I fix this? (error: no match for ‘operator==’ (operand types are ‘std::string’ {aka ‘std::__cxx11::basic_string’} and ‘int’)
所以我的基本程序(我剛剛開始)看起來像這樣:
#include <iostream>
using namespace std;
string PIN;
int main()
{
cout << "witaj w naszym banku" << endl;
cout << "podaj numer PIN: ";
cin >> PIN;
if (PIN == 0137) {
cout << "Poprawny PIN";
}
else {
cout << "Niepoprawny PIN";
}
return 0;
}
當我嘗試運行它時,我收到以下消息:
main.cpp:21:20: error: no match for ‘operator==’ (operand types are ‘std::string’ {aka ‘std::__cxx11::basic_string’} and ‘int’)
對於這部分代碼:
if (PIN==0137)
我不知道該怎么辦
像這樣寫
if (PIN == "0137"){
....
}
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