Hello do you know why when i enter to ‘makeI’ a letter, it loops and skip line ‘cin >> makeI’ ?

while (endBo == true){
        cin >> makeI;
        
        switch (makeI)
        {
            case 1:showBalance();cin >> makeI;break;
            case 2:takeMoney();break;
            case 3:putMoney();break;
            case 4:endBo=false;break;
            default: cout << "Please enter what you want to do (1,2,3,4): ";makeI=0;break;
        }

        
    }

i cant explain what i did already. Sorry.