21 lines
774 B
Java
21 lines
774 B
Java
public static void triangle(int n){
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n= 1 << n;
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StringBuilder line= new StringBuilder(); //use a "mutable String"
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char t= 0;
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char u= 0; // avoid warnings
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for(int i= 0;i <= 2 * n;++i)
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line.append(" "); //start empty
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line.setCharAt(n, '*'); //with the top point of the triangle
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for(int i= 0;i < n;++i){
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System.out.println(line);
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u= '*';
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for(int j= n - i;j < n + i + 1;++j){
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t= (line.charAt(j - 1) == line.charAt(j + 1) ? ' ' : '*');
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line.setCharAt(j - 1, u);
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u= t;
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}
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line.setCharAt(n + i, t);
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line.setCharAt(n + i + 1, '*');
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}
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}
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