java for循环练习题

以下是一些Java的for循环练习题：

输出四行直角三角形：

for (int i = 0; i < 5; i++) {
   for (int j = 0; j < i; j++) {
      System.out.print("*");
   }
   System.out.println();
}

输出七行等腰三角形：

for (int i = 0; i < 7; i++) {
   for (int j = 0; j < 7; j++) {
      if (j > i) System.out.print(" ");
   }
   for (int j = 0; j <= i; j++) {
      System.out.print("*");
   }
   for (int j = 0; j < i; j++) {
      System.out.print("*");
   }
   System.out.println("");
}

输出七行棱形：

for (int a = 1; a <= 4; a++) {
   for (int b = 1; b <= 4 - a; b++) {
      System.out.print(" ");
   }
   for (int c = 1; c <= a * 2 - 1; c++) {
      System.out.print("*");
   }
   System.out.println();
}
for (int d = 3; d >= 1; d--) {
   for (int b = 1; b <= 4 - d; b++) {
      System.out.print(" ");
   }
   for (int c = 4 - d; c <= 2 * d; c++) {
      System.out.print("*");
   }
   System.out.println();
}

斐波那契数列（for循环实现）：

int n = 10; // 斐波那契数列的长度
int[] fib = new int[n];
fib = 0;
fib = 1;
for (int i = 2; i < n; i++) {
   fib[i = fib[i - 1 + fib[i - 2];
}
for (int i = 0; i < n; i++) {
   System.out.print(fib[i + " ");
}

正向乘法表：

for (int i = 1; i <= 9; i++) {
   for (int j = 1; j <= i; j++) {
      System.out.print(j + " X " + i + " = " + (i * j) + "\t");
   }
   System.out.println();
}

循环输入周一到周五的成绩，并计算平均分、最高分和最低分：

Scanner input = new Scanner(System.in);
double sum = 0;
int maxScore = Integer.MIN_VALUE;
int minScore = Integer.MAX_VALUE;
for (int i = 1; i <= 5; i++) {
   System.out.println("请输入周" + i + "的成绩：");
   int score = input.nextInt();
   while (score < 0) {
      System.out.println("成绩不能为负数，请重新输入：");
      score = input.nextInt();
   }
   sum += score;
   maxScore = Math.max(maxScore, score);
   minScore = Math.min(minScore, score);
}
double average = sum / 5;
System.out.println("这五个数的平均数：" + average);
System.out.println("这五个数的最高数：" + maxScore);
System.out.println("这五个数的最低数：" + minScore);

#### 引用[.reference_title]
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