avoids buffer overflow with cin.width : cin « Development « C++ Tutorial

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3. cin

#include <iostream>  
  #include <iomanip>             
  using namespace std;  
    
  int main(){  
     const int MAX = 20; 
     char str[MAX];      
    
     cout << "\nEnter a string: ";  
     cin >> setw(MAX) >> str;
     cout << "You entered: " << str << endl;  
     return 0;  
    }