Default Arguments

Default arguments fill in a parameter when the caller leaves an argument out.

default_arguments.cpp

#include <iostream>
#include <string>

std::string repeatWord(std::string word, int times = 1) {
    std::string result = "";
    for (int i = 0; i < times; i++) {
        result += word;
    }
    return result;
}

int main() {
    std::string word = ;
    int times = ;

    std::string once = repeatWord(word);
    std::string repeated = repeatWord(word, times);

    std::cout << "once=" << once << std::endl;
    std::cout << "repeated=" << repeated << std::endl;
    return 0;
}

#include <iostream>
#include <string>

std::string repeatWord(std::string word, int times = 1) {
    std::string result = "";
    for (int i = 0; i < times; i++) {
        result += word;
    }
    return result;
}

int main() {
    std::string word = ;
    int times = ;

    std::string once = repeatWord(word);
    std::string repeated = repeatWord(word, times);

    std::cout << "once=" << once << std::endl;
    std::cout << "repeated=" << repeated << std::endl;
    return 0;
}

#include <iostream>
#include <string>

std::string repeatWord(std::string word, int times = 1) {
    std::string result = "";
    for (int i = 0; i < times; i++) {
        result += word;
    }
    return result;
}

int main() {
    std::string word = ;
    int times = ;

    std::string once = repeatWord(word);
    std::string repeated = repeatWord(word, times);

    std::cout << "once=" << once << std::endl;
    std::cout << "repeated=" << repeated << std::endl;
    return 0;
}

#include <iostream>
#include <string>

std::string repeatWord(std::string word, int times = 1) {
    std::string result = "";
    for (int i = 0; i < times; i++) {
        result += word;
    }
    return result;
}

int main() {
    std::string word = ;
    int times = ;

    std::string once = repeatWord(word);
    std::string repeated = repeatWord(word, times);

    std::cout << "once=" << once << std::endl;
    std::cout << "repeated=" << repeated << std::endl;
    return 0;
}

#include <iostream>
#include <string>

std::string repeatWord(std::string word, int times = 1) {
    std::string result = "";
    for (int i = 0; i < times; i++) {
        result += word;
    }
    return result;
}

int main() {
    std::string word = ;
    int times = ;

    std::string once = repeatWord(word);
    std::string repeated = repeatWord(word, times);

    std::cout << "once=" << once << std::endl;
    std::cout << "repeated=" << repeated << std::endl;
    return 0;
}

#include <iostream>
#include <string>

std::string repeatWord(std::string word, int times = 1) {
    std::string result = "";
    for (int i = 0; i < times; i++) {
        result += word;
    }
    return result;
}

int main() {
    std::string word = ;
    int times = ;

    std::string once = repeatWord(word);
    std::string repeated = repeatWord(word, times);

    std::cout << "once=" << once << std::endl;
    std::cout << "repeated=" << repeated << std::endl;
    return 0;
}

#include <iostream>
#include <string>

std::string repeatWord(std::string word, int times = 1) {
    std::string result = "";
    for (int i = 0; i < times; i++) {
        result += word;
    }
    return result;
}

int main() {
    std::string word = ;
    int times = ;

    std::string once = repeatWord(word);
    std::string repeated = repeatWord(word, times);

    std::cout << "once=" << once << std::endl;
    std::cout << "repeated=" << repeated << std::endl;
    return 0;
}

#include <iostream>
#include <string>

std::string repeatWord(std::string word, int times = 1) {
    std::string result = "";
    for (int i = 0; i < times; i++) {
        result += word;
    }
    return result;
}

int main() {
    std::string word = ;
    int times = ;

    std::string once = repeatWord(word);
    std::string repeated = repeatWord(word, times);

    std::cout << "once=" << once << std::endl;
    std::cout << "repeated=" << repeated << std::endl;
    return 0;
}

#include <iostream>
#include <string>

std::string repeatWord(std::string word, int times = 1) {
    std::string result = "";
    for (int i = 0; i < times; i++) {
        result += word;
    }
    return result;
}

int main() {
    std::string word = ;
    int times = ;

    std::string once = repeatWord(word);
    std::string repeated = repeatWord(word, times);

    std::cout << "once=" << once << std::endl;
    std::cout << "repeated=" << repeated << std::endl;
    return 0;
}

default argument A default argument is written in the function declaration and used only when that argument is omitted.