$$config title: 백준 2444 keywords: - IT - 백준 - 심화1 $$ # 별 찍기 - 7 ## python #### 재귀함수 사용 ```py def star(input, index, num) : for i in range(input - index) : print(" ", end = '') for i in range(2 * index - 1) : print("*", end = '') print() num += 1 if num == input * 2 : return if num > input : index -= 1 star(input, index, num) elif num <= input : index += 1 star(input, index, num) input = int(input()) index = 1 num = 1 star(input, index, num) ``` #### 반복, 조건 사용 ```py input = int(input()) for i in range(1, 2 * input) : if i <= input : for j in range(input - i) : print(" ", end = '') for j in range(2 * i - 1) : print("*", end = '') print() else : for j in range(i - input) : print(" ", end = '') for j in range(2 * (2 * input - i) - 1) : print("*", end = '') print() ``` ## javascript #### 재귀함수 사용 ```js let fs = require('fs'); // /dev/stdin let input = fs.readFileSync('./test.txt').toString(); const star = (number, index, num) => { for(let i = 0; i < input - index; i++) { process.stdout.write(" "); } for(let i = 0; i < 2 * index - 1; i++) { process.stdout.write("*"); } console.log(""); num += 1; if(num == input * 2) { return 0; } if(num > input) { index -= 1; star(input, index, num); } else if(num <= input) { index += 1; star(input, index, num); } } let index = 1; let num = 1; star(input, index, num); ``` #### 반복, 조건 사용 ```js let fs = require('fs'); let input = fs.readFileSync('/dev/stdin').toString(); for(let i = 1; i < 2 * input; i++) { if(i <= input) { for(let j = 0; j < input - i; j++) { process.stdout.write(" "); } for(let j = 0; j < 2 * i - 1; j++) { process.stdout.write("*"); } console.log(); } else { for(let j = 0; j < i - input; j++) { process.stdout.write(" "); } for(let j = 0; j < 2 * (2 * input - i) - 1; j++) { process.stdout.write("*"); } console.log(); } } ``` ## java ```java ```