乘法九九表

打印乘法九九表，包括：全部，左上，左下，右上，右下，左三角，右三角，上三角，下三角。

#define _CRT_SECURE_NO_WARNINGS

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

#define _CRT_SECURE_NO_WARNINGS

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

void main_all()
{
    int i, j;

    printf(" ");

    for (i = 0;i < 10;i++)
    {
        printf("%7d", i);
    }

    printf("
-----------------------------------------------------------------------------
");

    for (i = 0;i < 10;i++)
    {
        printf("%-5d", i);

        for (j = 0;j < 10;j++)
        {
            printf("%d*%d=%-3d", i, j, i*j);
        }
        printf("
");
    }
}

void main_lower_left()
{
    int i, j;

    printf(" ");

    for (i = 0;i < 10;i++)
    {
        printf("%7d", i);
    }

    printf("
-----------------------------------------------------------------------------
");

    for (i = 0;i < 10;i++)
    {
        printf("%-5d", i);

        for (j = 0;j <= i;j++)
        {
            printf("%d*%d=%-3d", i, j, i*j);
        }
        printf("
");
    }
}

void main_upper_right()
{
    int i, j;

    printf(" ");

    for (i = 0;i < 10;i++)
    {
        printf("%7d", i);
    }

    printf("
-----------------------------------------------------------------------------
");

    for (i = 0;i < 10;i++)
    {
        printf("%-5d", i);

        for (j = 0;j < 10;j++)
        {
            if (i <= j)
            {
                printf("%d*%d=%-3d", i, j, i*j);
            }
            else
            {
                printf("%7s", " ");
            }
        }
        printf("
");
    }
}

void main_upper_left()
{
    int i, j;

    printf(" ");

    for (i = 0;i < 10;i++)
    {
        printf("%7d", i);
    }

    printf("
-----------------------------------------------------------------------------
");

    for (i = 0;i < 10;i++)
    {
        printf("%-5d", i);

        for (j = 0;j <= 9 - i;j++)
        {
            printf("%d*%d=%-3d", i, j, i*j);
        }
        printf("
");
    }
}

void main_lower_right()
{
    int i, j;

    printf(" ");

    for (i = 0;i < 10;i++)
    {
        printf("%7d", i);
    }

    printf("
-----------------------------------------------------------------------------
");

    for (i = 0;i < 10;i++)
    {
        printf("%-5d", i);

        for (j = 0;j < 10;j++)
        {
            if (i >= 9 - j)
            {
                printf("%d*%d=%-3d", i, j, i*j);
            }
            else
            {
                printf("%7s", " ");
            }
        }
        printf("
");
    }
}

void main_dui_jiao_xian()
{
    int i, j;

    printf(" ");

    for (i = 0;i < 10;i++)
    {
        printf("%7d", i);
    }

    printf("
-----------------------------------------------------------------------------
");

    for (i = 0;i < 10;i++)
    {
        printf("%-5d", i);

        for (j = 0;j < 10;j++)
        {
            if (i == j || i == 9 - j)
            {
                printf("%d*%d=%-3d", i, j, i*j);
            }
            else
            {
                printf("%7s", " ");
            }
        }
        printf("
");
    }
}

void main_left()
{
    int i, j;

    printf(" ");

    for (i = 0;i < 10;i++)
    {
        printf("%7d", i);
    }

    printf("
-----------------------------------------------------------------------------
");

    for (i = 0;i < 10;i++)
    {
        printf("%-5d", i);

        for (j = 0;j < 10;j++)
        {
            if (i >= j && i <= 9 - j)
            {
                printf("%d*%d=%-3d", i, j, i*j);
            }
            else
            {
                printf("%7s", " ");
            }
        }
        printf("
");
    }
}

void main_right()
{
    int i, j;

    printf(" ");

    for (i = 0;i < 10;i++)
    {
        printf("%7d", i);
    }

    printf("
-----------------------------------------------------------------------------
");

    for (i = 0;i < 10;i++)
    {
        printf("%-5d", i);

        for (j = 0;j < 10;j++)
        {
            if (i <= j && i >= 9 - j)
            {
                printf("%d*%d=%-3d", i, j, i*j);
            }
            else
            {
                printf("%7s", " ");
            }
        }
        printf("
");
    }
}

void main_upper()
{
    int i, j;

    printf(" ");

    for (i = 0;i < 10;i++)
    {
        printf("%7d", i);
    }

    printf("
-----------------------------------------------------------------------------
");

    for (i = 0;i < 10;i++)
    {
        printf("%-5d", i);

        for (j = 0;j < 10;j++)
        {
            if (i <= j && i <= 9 - j)
            {
                printf("%d*%d=%-3d", i, j, i*j);
            }
            else
            {
                printf("%7s", " ");
            }
        }
        printf("
");
    }
}

void main_lower()
{
    int i, j;

    printf(" ");

    for (i = 0;i < 10;i++)
    {
        printf("%7d", i);
    }

    printf("
-----------------------------------------------------------------------------
");

    for (i = 0;i < 10;i++)
    {
        printf("%-5d", i);

        for (j = 0;j < 10;j++)
        {
            if (i >= j && i >= 9 - j)
            {
                printf("%d*%d=%-3d", i, j, i*j);
            }
            else
            {
                printf("%7s", " ");
            }
        }
        printf("
");
    }
}

main()
{
    main_all();
    printf("
");

    main_upper_right();
    printf("
");

    main_lower_left();
    printf("
");

    main_upper_left();
    printf("
");

    main_lower_right();
    printf("
");

    main_dui_jiao_xian();
    printf("
");

    main_left();
    printf("
");
    
    main_right();
    printf("
");

    main_upper();
    printf("
");

    main_lower();
    printf("
");

    getchar();
}