Question

Write a program that prints the following pattern to the screen. (no blank lines between lines) You must use nested for loops.

1

212

32123

4321234

543212345

c++

Answer 1

#include <iostream>

using namespace std;

int main() {
    int n = 5;  // you can change it to any number you want
    for (int i = 1; i <= n; ++i) {  // print n rows
        // print (n-i) spaces first
        for (int j = 0; j < n - i; ++j) {
            cout << " ";
        }
        // then print from i to 1
        for (int j = i; j >= 1; --j) {
            cout << j;
        }
        // and then print from 2 to i
        for (int j = 2; j <= i; ++j) {
            cout << j;
        }
        // after each row, print a new line
        cout << endl;
    }
    return 0;
}

1 212 32123 4321234 543212345