Structured Program I – Print a Chessboard

coding>C++
853 词

题目描述

Draw a chessboard which has a height of H cm and a width of W cm. For example, the following figure shows a chessboard which has a height of 6 cm and a width of 10 cm.

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#.#.#.#.#.
.#.#.#.#.#
#.#.#.#.#.
.#.#.#.#.#
#.#.#.#.#.
.#.#.#.#.#

Note that the top left corner should be drawn by ‘#’.

输入

The input consists of multiple datasets. Each dataset consists of two integers H and W separated by a single space.
The input ends with two 0 (when both H and W are zero).

输出

For each dataset, print the chessboard made of ‘#’ and ‘.’.
Print a blank line after each dataset.

题解

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#include<iostream>
using namespace std;
int main() {
    int h, w;
    cin >> h >> w;
    while (h != 0) {
        int i, j;
        for (i = 0; i < h; i++) {
            for (j = 0; j < w; j++) {
                if ((i % 2 == 0 && j % 2 == 0  i % 2 == 1 && j % 2 == 1))cout << "#";
                else cout << ".";
            }
            cout << endl;
        }
        cout << endl;
        cin >> h >> w;
    }
    return 0;
}