7.21 学习笔记 循环嵌套

#include <stdlib.h>
int main()
{
    for (int i = 1; i <= 7; i++)
    {
        for (int a = 1; a <= 7; a++)
        {
            printf("*");
        }
        printf("\n");
    }
    return 0;
}

#include <stdlib.h>
int main()
{
    for (int i = 5; i >= 1; i--)
    {
        for (int j = 1; j <= i; j++)
        {
            printf("*");
        }
        printf("\n");
    }
    return 0;
}

#include <stdlib.h>
int main()
{
    for (int i = 1; i <= 5; i++)
    {
        for (int j = 1; j <= i; j++)
        {
            printf("*");
        }
        printf("\n");
    }
    return 0;
}

#include <stdlib.h>
int main()
{
    for (int i = 1; i <= 5; i++)
    {
        for (int j = 1; j <= i-1; j++)
        {
            printf(" ");
        }
        for (int k = 1; k <= 6 - i; k++)
        {
            printf("*");
        }
        printf("\n");
    }
    return 0;
}

#include <stdlib.h>
int main()
{
    for (int i = 1; i <= 9; i++)
    {
        for (int j = 1; j <= i; j++)
        {

            printf("%d*%d=%d\t", j, i, i * j);
        }
        printf("\n");
    }
    return 0;
}

#include <stdio.h>
int main()
{
    int a;
    for (int m = 100; m; m--)
    {
        for (a = 2; a <= m; a++)
        {
            int c = m % a;
            if (c == 0)
            {
                break;
            }
        }
        if (a == m)
        {
            printf("%d\n", m);
        }
    }
    return 0;
}

#include <stdio.h>
int main()
{
    int a, b, c;
    for (a = 1; a <= 19; a++)
    {
        for (b = 1; b <= 33; b++)
        {
            c = 100 - a - b;
            if (5 *a + 3 *b + c / 3 == 100 &&c % 3 == 0)
            {
                printf("a=%d,b=%d,c=%d\n", a, b, c);
            }
        }
    }
    return 0;
}