Question

老师布置了几个编程作业，怎么用java实现打印杨辉三角的前n行，急急急

Answer 1

Scanner s = new Scanner(System.in);
System.out.println("请输入整数n：");
int n = s.nextInt();

int[][] num = new int[n][];
for(int i = 0; i < n; i++){
num[i] = new int[i + 1];
}

for(int i = 0; i < n; i++){
num[i][0] = 1;
num[i][i] = 1;
}

for(int i = 2; i < n; i++){
for(int j = 1; j < i; j++){
num[i][j] = num[i - 1][j] + num[i - 1][j - 1];
}
}

for(int i = 0; i < num.length; i++){
for(int j = 0; j < num[i].length; j++){
System.out.print(num[i][j] + "\t");
}
System.out.println();
}