學(xué)過(guò)編程的朋友都知道，當(dāng)初為了學(xué)習(xí)編程語(yǔ)言中的各種語(yǔ)法結(jié)構(gòu)，我們要試著解決各種各樣奇怪的題目。其中"數(shù)星星"就似乎其中的一種。什么是"數(shù)星星"呢？就是打印各種形狀的"*"，正三角、倒三角、菱形等等。本篇博客純粹為了紀(jì)念我們逝去的歲月。

a）正三角

void star_1()
{
    int outer;
    int inner;

    for(outer = 1; outer <10; outer ++){
        for(inner = 1; inner <= outer; inner ++){
            printf("%c ", '*');
        }
        printf("n");
    }
}

b）倒三角

void star_2()
{
    int outer;
    int inner;

    for(outer = 9; outer >= 1; outer --){
        for(inner = 1; inner <= outer; inner ++){
            printf("%c ", '*');
        }
        printf("n");
    }
}

c）左三角????????????

void star_3()
{
    int outer;
    int inner;

    for(outer = -4; outer <= 4; outer ++){
        for(inner = 1; inner <= (5 - abs(outer)); inner ++){
            printf("*");
        }

        for(; inner <= 5; inner ++){
            printf(" ");
        }

        printf("n");
    }
}

d） 右三角

void star_4()
{
    int outer;
    int inner;

    for(outer = -4; outer <= 4; outer ++){
        for(inner = 1; inner <= abs(outer); inner ++){
            printf(" ");
        }

        for(; inner <= 5; inner ++){
            printf("*");
        }

        printf("n");
    }
}

e）垂直菱形

void star_5()
{
    int outer;
    int inner;

    for(outer = -4; outer <= 4; outer ++){
        for(inner = -4; inner <= abs(outer) -5; inner ++){
            printf(" ");
        }

        for(; inner <= 5 - abs(outer); inner ++){
            printf("*");
        }

        printf("n");
    }
}

f）水平菱形

void star_6()
{
    int outer;
    int inner;

    for(outer = -9; outer <= 0; outer ++){
        for(inner = outer; inner < 0; inner ++){
            printf(" ");
        }

        for(; inner <= 9; inner ++){
            printf("*");
        }

        printf("n");
    }
}

g）楊輝三角形

void star_7()
{
    int outer;
    int inner;

    for(outer = 1; outer <10; outer ++){
        for(inner = 1; inner <= outer; inner ++){
            printf("%3d ", outer * inner);
        }
        printf("n");
    }
}