How would I make an underline exactly the length of any text inputted as well as capitalizing every letter

user_17323323 0
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Sorry I'm really new to programming and need some assistance. How would I make this happen. This is the function I currently have.

void DisplayTitle(string aTitle) {
    cout << "\t" << aTitle << endl;
    cout << "\t--------------\n\n";
}

How would I go about making sure that no matter which title is inputted, every character will be capitalized and the underscores will be the same amount of characters as the displayed title above.

c++
2 Answers

You can use std::setfill combined with std::setw from <iomanip> as follows:

std::cout << std::setfill('-') << std::setw(title.size()) << "";

Here, you're telling the stream to use a padding character of '-', then a padded output size that's the length of your title, and then output an empty string. Because the string is empty, it will pad that entire area.

#include <iostream>
#include <iomanip>
#include <string>

void DisplayTitle(const std::string& title, const char* prefix = "\t")
{
    std::cout << prefix << title << "\n";
    std::cout << prefix << std::setfill('-') << std::setw(title.size()) << "" << "\n\n";
}

int main()
{
    for (std::string title; std::getline(std::cin, title); )
    {
        DisplayTitle(title);
    }
}

Example input:

One flew over the cuckoo's nest
The birds and the bees

Example output:

        One flew over the cuckoo's nest
        -------------------------------

        The birds and the bees
        ----------------------

Here is a live demo of the above.

Oh, it seems I missed the fact your question was asking two things. You also want to capitalize the title. You can do that with std::transform, and in fact it can even be done without modifying the string:

void DisplayTitle(const std::string& title, const char* prefix = "\t")
{
    // Write title in all-caps
    std::cout << prefix;
    std::transform(title.begin(), title.end(), 
        std::ostream_iterator<char>(std::cout),
        [](char c) { return std::toupper(c); });
    std::cout << "\n";
    
    // Underline title
    std::cout << prefix << std::setfill('-') << std::setw(title.size()) << "" << "\n\n";
}

Here is the updated live demo with the above change.

user_15530900

You can use std::transform and to_upper to capitalize the string.

You can use std::string's two-parameter constructor which takes a length and a character to generate a sequence of - of the same length as the title

Together we get:

#include <iostream>
#include <string>
#include <algorithm>

void DisplayTitle(std::string aTitle) {
    std::transform(aTitle.begin(), aTitle.end(), aTitle.begin(), toupper);

    std::cout << "\t" << aTitle << "\n";
    std::cout << "\t" << std::string(aTitle.length(), '-') << "\n\n";
}

int main()
{
    for (std::string title; std::getline(std::cin, title); )
    {
        DisplayTitle(title);
    }
}

demo on godbolt

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