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- #include<iostream>
- using namespace std;
- int main(){
- float liczba;
- bool err = false;
- do{
- cout << "podaj liczbe :" << endl;
- cin >> liczba;
- if(cin.fail()){
- err = true;
- }else{
- cout << liczba;
- };
- cin.clear();
- }while(!err);
- return 0;
- }
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