Embercode: AI-powered software engineer course

1. What does this program print? ``

cpp
#include <iostream>
#include <string>
#include <vector>

std::string zigzag_convert(const std::string& text, int num_rows) {
    if (num_rows < 2) {
        return text;
    }
    std::vector<std::string> rows(num_rows);
    int row = 0;
    int dir = 1;
    for (char c : text) {
        rows[row] += c;
        int next = row + dir;
        if (next < 0 || next >= num_rows) {
            dir = -dir;
        }
        row += dir;
    }
    std::string result;
    for (const std::string& r : rows) {
        result += r;
    }
    return result;
}

int main() {
    std::cout << zigzag_convert("ABCDEFG", 3) << '\n';
}

``

ABCDEFGACEGBDFAEBDFCGAEBDFGC

2. This program uses std::left with std::setw(6). What does it print? ``

cpp
#include <iomanip>
#include <iostream>

int main() {
    std::cout << std::left << std::setw(6) << "ab" << "|\n";
}

``

ab|ab|ab |ab |

3. Which header must be included to use std::setw? Type the name between the angle brackets.

Type your answer.

4. The price list in the lesson sets std::fixed and std::setprecision(2) before printing the prices. With those two settings, the double value 2.5 prints as what text? Type it exactly.

Type your answer.

5. Why does zigzag_convert return the text unchanged when num_rows < 2?

An empty string would otherwise be printedWith one row, the next row is always outside the grid, so the marker has no row to move toA std::vector cannot hold a single stringThe loop would run zero times and the result would be empty

Zigzag and tables