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string guessNo; **Hi! How do I validate the user input in C++ ? I just want the guessNo string to have** 4 characters, all of which are numbers**.** 
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**Hi! How do I put the random number generated in an array so that I can make each number in it unique? Thanks! :)** #include <cstdlib> #include <ctime> #include <iostream> using namespace std; int generateRandomNo(int randomNumber){ srand(time(0)); randomNumber = rand()%10000; return randomNumber; } int main(){ int randomNumber; cout << generateRandomNo(randomNumber); …
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