c++ - How to reset std::cin when using it? -

i have problem following code. use in xcode (os x).

[removed first try of code]

how input reset std::cin? try input values can't because std::cin seems not work anymore after wrong value.

upd2 in second try use code:

for ( unsigned char = 0; < 5; i++ ) {      int value = 0;      std::cout << "\n>> enter \"value\": ";     std::cin >> value;      if ( std::cin.fail() ) {         std::cin.clear();         std::cin.ignore();         std::cout << "error: it's not integer value!\n";     } else {         std::cout << "the value format ok!\n";     }      std::cout << "value = " << value << std::endl;  } 

here input 5 values in loop. everytime check on error. when set wrong value ("asdf") std::cin goes crazy , doesn't work anymore. output:

>> enter "value": 4 value format ok! value = 4  >> enter "value": 234 value format ok! value = 234  >> enter "value": asdfghjkl error: it's not integer value! value = 0  >> enter "value": error: it's not integer value! value = 0  >> enter "value": error: it's not integer value! value = 0 234 234 78 345 657 345 dsf f 

you use, when condition, std::cin.fail() happens:

std::cin.clear(); std::cin.ignore(); 

and continue loop, continue; statement. std::cin.clear() clears error flags, , sets new ones, , std::cin.ignore() ignores them (by extracting , discarding them).

sources:

1. cin.ignore()
2. cin.clear()