c++ - Program returning multiple results -

i'm writing basic random number guessing game, , i'm trying perfect bit when comes entering illegal characters, , long numbers outside of range 1-100 entered program tells user , user gets redo it, same goes letters. however, if enter 23x5 end getting double error messages, both letter , high/too low depending on random number. how sort out entry go under letter error message well?

here's code: header.h

#ifndef header_h #define header_h  int nguessednumber; int nnumberofguesses = 1; int nrandomnumber;  int userinput();   #endif 

source.cpp

#include "stdafx.h" #include <iostream> #include <cstdlib> #include <ctime> using namespace std;  extern int nguessednumber;  int userinput() {     while(!(cin >> nguessednumber))         {             cin.clear();             while(cin.get() != '\n'){}              cout << "i asked number between 1 , 100.\n";         }     return nguessednumber; } 

main.cpp

#include "stdafx.h" #include <iostream> #include <cstdlib> #include <ctime> #include "header.h" using namespace std;  int main() {     srand(time(0));     nrandomnumber = rand() % 100 + 1;// sets random number between 1 , 100      cout << "guess number 1 100: " << endl;     userinput();      while (nguessednumber != nrandomnumber)     {         if ((nguessednumber < 1) || (nguessednumber > 100))         {             cout << "oi! between 1 , 100!\n";             userinput();         }         else         {             if (nguessednumber < nrandomnumber)             {                 (nguessednumber; nguessednumber < nrandomnumber; nnumberofguesses++)                 {                     cout << "too low, try again!" <<endl;                     userinput();                 }             }             else if (nguessednumber > nrandomnumber)             {                 (nguessednumber; nguessednumber > nrandomnumber; nnumberofguesses++)                 {                     cout << "too high, try again!"<< endl;                     userinput();                 }             }         }     }     if (nguessednumber == nrandomnumber)     {         cout << "congratulations! " << nguessednumber << " correct!" << endl;         cout << "you guessed " << nnumberofguesses << " times." << endl;     }     system("pause");     return 0; } 

read whole lines std::cin , parse them individually using std::istringstream:

int userinput() {     std::string line;     while (getline(std::cin, line)) {         std::istringstream is(line);         if (is >> nguessednumber) {             ...             return nguessednumber;         } else {             ...         }     } }