c언어과제2

#include <stdio.h>

int main() {
    int size = 0;
    int space = 0;
    int star = 1;
    int isUp = 1;
    int line = 0;
    //단순화를 위해 짝수에서만 사용.
    int lineSize = 0;
    printf("양의 정수를 입력하세요. ");
    scanf("%d", &size);
    if (size % 2 == 1) {
        //홀수진입
        space = (size + 3) / 2;
        while(1) {
            for (int i = 0; i < space; i++) {
                printf(" ");
            }
            for (int i = 0; i < star; i++) {
                printf("*");
            }
            for (int i = 0; i < space; i++) {
                printf(" ");
            }
            printf("\n");
            if (star == size) {
                isUp = 0;
            }
            if (isUp) {
                //상단부
                space--;
                star += 2;
            }
            else {
                //하단부
                space++;
                star -= 2;
            }
            if (star <= 0) {
                break;
            }
        }

    }
    else {
        //짝수진입
        //1번째 라인 배제
        lineSize = size + 4;
        space = size / 2 + 2;
        for (int i = 0; i < space; i++) {
            printf(" ");
        }
        for (int i = 0; i < star; i++) {
            printf("*");
        }
        for (int i = 0; i < (lineSize - space - star); i++) {
            printf(" ");
        }
        printf("\n");
        star++;
        space--;
        while(1) {
            for (int i = 0; i < space; i++) {
                printf(" ");
            }
            for (int i = 0; i < star; i++) {
                printf("*");
            }
            for (int i = 0; i < (lineSize - space - star); i++) {
                printf(" ");
            }
            printf("\n");
            if (star == size) {
                isUp = 0;
            }
            if (isUp) {
                //상단부
                space--;
                star += 2;
            } else {
                //하단부
                if (star == 2) {
                    break;
                }
                space++;
                star -= 2;
            }
        }
        //마지막 줄 예외
        star--;
        for (int i = 0; i < space; i++) {
            printf(" ");
        }
        for (int i = 0; i < star; i++) {
            printf("*");
        }
        for (int i = 0; i < (lineSize - space - star); i++) {
            printf(" ");
        }
        printf("\n");
    }



    return 0;
}

/*
n=8
______*_____        6/1/5
_____**_____        5/2/5
____****____        4/4/4
___******___        3/6/3
__********__        2/8/2
___******___        3/6/3
____****____        4/4/4
_____**_____        5/2/5
_____*______        5/1/6

n=7
_____*_____     5/1/5
____***____     4/3/4
___*****___     3/5/3
__*******__     2/7/2
___*****___     3/5/3
____***____     4/3/4
_____*_____     5/1/5

n=6
_____*____      5/1/4
____**____      4/2/4
___****___      3/4/3
__******__      2/6/2
___****___      3/4/3
____**____      4/2/4
____*_____      4/1/5

n=5
____*____       4/1/4
___***___       3/3/3
__*****__       2/5/2
___***___       3/3/3
____*____       4/1/4

n=4
____*___        4/1/3
___**___        3/2/3
__****__        2/4/2
___**___        3/2/3
___*____        3/1/4

n=3
___*___         3/1/3
__***__         2/3/2
___*___         3/1/3

n=2
___*___         3/1/3
__**___         2/2/3
__*____         2/1/4

_________________________________

n=1
__*__           2/1/2


모두 메인 위치에선
2/n/2를 취함
즉 최대값은 n+4

n이 홀수:
메인 계산 : (메인 + 1) / 2



(n+3) / 2 / 1 / (n+3) / 2

*/