Default Arguments

Lab C++ Beginner 10 points

Write string repeat(const string &s, int times = 2, const string &sep = "-"). For each input line with 1, 2 or 3 parts, call it with that many arguments and print the result.

Input

n, then n lines.

Output

n lines.

Example

Input

3
ab
xy 4
hi 3 +

Output

ab-ab
xy-xy-xy-xy
hi+hi+hi

Sample input available Sample output available

Editor

C++

Hints

Default values are used for arguments you leave out.

After cin >> n, call getline once to finish that line.

Solution explanation

Default arguments must come last in the parameter list.

Show solution

#include <iostream>
#include <sstream>
#include <string>
using namespace std;

string repeat(const string &s, int times = 2, const string &sep = "-") {
    string out;
    for (int i = 0; i < times; i++) {
        if (i > 0) out += sep;
        out += s;
    }
    return out;
}

int main() {
    int n;
    cin >> n;
    string line;
    getline(cin, line);
    for (int i = 0; i < n; i++) {
        getline(cin, line);
        istringstream in(line);
        string word, sep;
        int times;
        in >> word;
        if (!(in >> times)) {
            cout << repeat(word) << "\n";
        } else if (!(in >> sep)) {
            cout << repeat(word, times) << "\n";
        } else {
            cout << repeat(word, times, sep) << "\n";
        }
    }
    return 0;
}

Output

Answer