4~20求解！跪了码神们

Question

Answer 1

思考

#include <stdio.h>

int main()
{
    int i, j;

    printf("  |");
    for (i = 1; i <= 9; i++)
    {
        printf("%3d", i);
    }
    printf("\n");

    for (i = 0; i < 30; i++)
    {
        printf("-");
    }
    printf("\n");

    for (i = 1; i <= 9; i++)
    {
        printf("%d |", i);

        for (j = 1; j <= 9; j++)
        {
            printf("%3d", i * j);
        }
        printf("\n");
    }
    
    return 0;
}