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How i can stop the program to input an invalid code. i am asking for a number then the user enter a letter how i can prevent it?

int accnum,bl; cout<<"Enter Account Number : "; cin>>accnum //now how to stop it pls help me because idk how to stop it while(accnum < 0 || accnum > 9) { cout<<"Invalid Account Number. It must be 0 to end"; //what if the user enter letter? cout<<"Enter Account Number"; cin>>accnum; } //then i dont want it to display the another cout. how i can stop displaying the cout cout<<"Enter Balance"; cin >>bl

20th Aug 2017, 12:42 AM
Brad Pete
1 Answer
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One thing you could do is to get the ascii equivalent of the input. Store the input as character type then typecast it to int. char accnum; cin >> accnum; int ascii = (int)accnum; //ascii will have value of 48 if accnum = 0, 49 if accnum = 1, ... 57 if accnum = 9. This would work because each character has an equivalent decimal in ascii. Then you could just do: if ( ascii < 48 || ascii > 57 ){ cout << "Enter a number" << endl; } else{ int input = ascii - 48; //this will return the original number } let me know if this has been helpful
20th Aug 2017, 1:49 PM
Joni Jimenez
Joni Jimenez - avatar