如何使用嵌套 for 循环使用 C++ 创建乘法表

Question

我正在尝试创建一个像这样的 Multiplication Table，但我遇到了间距问题。有人可以解释我哪里出错了。我在没有尝试创建 table 的情况下让程序运行，但每次我尝试创建 table 时，它都会出错。请帮忙

#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <iomanip>

using namespace std;
int main()
{
    int i,j;
    for(i=2; i <=9; i++)
    {
        cout << setw(9) << i << "   ";
    }
    for(j = 1; j<=9; j++)
    {
        cout << setw (9) << (i*j) << "    ";
    }

    printf("%d x %d = %d\n", i, j, i*j);
    cout << endl;
}

Answer 1

您需要使用嵌套循环。您可以使用 '\t' 特殊字符插入水平制表符，但如果您稍后决定制作更大的 table，这可能效果不佳。这是您预期输出的解决方案：

#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <iomanip>

using namespace std;

int main() 
{
    int i, j, k;

    for (k = 0; k < 2; k++)
    {
        for (j = 1; j < 10; j++)
        {
            for (i = 2 + 4*k; i < 6 + 4*k; i++)
            {
                cout << i << " x " << j << " = " << i * j << '\t';
            }
            cout << endl;
        }
        cout << endl;
    }

    return 0;
}

这输出：

2 x 1 = 2       3 x 1 = 3       4 x 1 = 4       5 x 1 = 5
2 x 2 = 4       3 x 2 = 6       4 x 2 = 8       5 x 2 = 10
2 x 3 = 6       3 x 3 = 9       4 x 3 = 12      5 x 3 = 15
2 x 4 = 8       3 x 4 = 12      4 x 4 = 16      5 x 4 = 20
2 x 5 = 10      3 x 5 = 15      4 x 5 = 20      5 x 5 = 25
2 x 6 = 12      3 x 6 = 18      4 x 6 = 24      5 x 6 = 30
2 x 7 = 14      3 x 7 = 21      4 x 7 = 28      5 x 7 = 35
2 x 8 = 16      3 x 8 = 24      4 x 8 = 32      5 x 8 = 40
2 x 9 = 18      3 x 9 = 27      4 x 9 = 36      5 x 9 = 45

6 x 1 = 6       7 x 1 = 7       8 x 1 = 8       9 x 1 = 9
6 x 2 = 12      7 x 2 = 14      8 x 2 = 16      9 x 2 = 18
6 x 3 = 18      7 x 3 = 21      8 x 3 = 24      9 x 3 = 27
6 x 4 = 24      7 x 4 = 28      8 x 4 = 32      9 x 4 = 36
6 x 5 = 30      7 x 5 = 35      8 x 5 = 40      9 x 5 = 45
6 x 6 = 36      7 x 6 = 42      8 x 6 = 48      9 x 6 = 54
6 x 7 = 42      7 x 7 = 49      8 x 7 = 56      9 x 7 = 63
6 x 8 = 48      7 x 8 = 56      8 x 8 = 64      9 x 8 = 72
6 x 9 = 54      7 x 9 = 63      8 x 9 = 72      9 x 9 = 81

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