當用戶在字符數組中輸入整數值時捕捉異常

Question

所以我的問題是如果我有一個字符數組，我只允許在其中輸入字符。如果我輸入字符的整數讓我們假設「abc123」，那麼這不應該被允許。我該怎麼做？

Answer 1

使用std::none_of，與isdigit一起：

#include <algorithm> 
#include <cctype> 
#include <string> 
#include <iostream> 

int main() 
{ 
    std::string test = "abc123"; 
    if (std::none_of(test.begin(), test.end(), ::isdigit)) 
     std::cout << "All good\n"; 
    else 
     std::cout << "You've entered an integer\n"; 

    // Try with good data 
    test = "abcdef"; 
    if (std::none_of(test.begin(), test.end(), ::isdigit)) 
     std::cout << "All good\n"; 
    else 
     std::cout << "You've entered an integer\n";  
} 

Live Example