Write algorithms step by step ("counting stars ")

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All the friends who have learned programming know that, in order to learn various syntax structures in programming languages, we should try to solve various strange questions. Among them, "counting stars" seems to be one of them. What is "Counting Stars? Is to print various shapes of "*", positive triangle, inverted triangle, diamond and so on. This blog is purely designed to commemorate our past years.

A) Positive triangle

void star_1(){int outer;int inner;for(outer = 1; outer <10; outer ++){for(inner = 1; inner <= outer; inner ++){printf("%c ", '*');}printf("\n");}}

B) inverted triangle

void star_2(){int outer;int inner;for(outer = 9; outer >= 1; outer --){for(inner = 1; inner <= outer; inner ++){printf("%c ", '*');}printf("\n");}}

C) Left triangle

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) Right Triangle

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) Vertical Diamond

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) Horizontal Diamond

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) Yang Hui triangle

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");}}