Java基础语法2

 作者：Mercury_Lc​​

​​SDUT Java基础语法练习2​​

I       C语言实验——打印菱形（SDUT 1174）

import java.util.Scanner;   

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n;
    n = sc.nextInt();
    for(int i = 0; i < n; i ++) 
    {
      for(int j = 0; j < n - i - 1; j ++)System.out.print(" ");
      for(int j = 0; j < i + 1; j ++)System.out.print('*');
      for(int j = 0; j < i; j ++)System.out.print('*');
      System.out.println("");
    }
    for(int i = n - 2; i >= 0; i --)
    {
      for(int j = 0; j < n - i - 1; j ++)System.out.print(" ");
      for(int j = i; j >= 0 ; j --)System.out.print('*');
      for(int j = i; j >= 1; j --)System.out.print('*');
      if(i != 0 )System.out.println("");
    }
  }
}

C语言实验——打印数字图形（SDUT 1179）

import java.util.Scanner;   

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n;
    n = sc.nextInt();
    for(int i = 0; i < n; i ++) 
    {
      for(int j = 0; j < n - i - 1; j ++)System.out.print(" ");
      for(int j = 0; j < i + 1; j ++)System.out.print(j + 1);
      for(int j = 0; j < i; j ++)System.out.print(i - j);
      System.out.println("");
    }
    for(int i = n - 2; i >= 0; i --)
    {
      for(int j = 0; j < n - i - 1; j ++)System.out.print(" ");
      for(int j = i; j >= 0 ; j --)System.out.print(i - j + 1);
      for(int j = i; j >= 1; j --)System.out.print(j);
      if(i != 0 )System.out.println("");
    }
  }
}

k     做乘法（SDUT 2249）

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n;
    n = sc.nextInt();
    for (int i = 1; i <= n; i++) {
      System.out.println(n + "*" + i + "=" + n * i);
    }
  }
}

L   期末考试之分等级（SDUT 2251）

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n, x;
    n = sc.nextInt();
    int a, b, c, d, e;
    a = b = c = d = e = 0;
    for (int i = 0; i < n; i++) {
      x = sc.nextInt();
      if (x >= 90)a++;
      else if (x < 90 && x >= 80)b++;
      else if (x < 80 && x >= 70)c++;
      else if (x < 70 && x >= 60)d++;
      else if (x < 60) e++;
    }
    System.out.print('A' + " " + a + "\n" + 'B' + " " + b + "\n" + 'C' + " " + c + "\n" + 'D' + " " + d + "\n" + 'E'
        + " " + e + "\n");
  }
}

M     C语言实验——矩阵转置（SDUT 1164）

import java.util.Scanner;
import java.util.Arrays;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n;
    int a[][] = new int[1000][1000];
    n = sc.nextInt();
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < n; j++) {
        a[i][j] = sc.nextInt();
      }
    }
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < n; j++) {
        if (j != n - 1)
          System.out.print(a[j][i] + " ");
        else
          System.out.print(a[j][i]);
      }
      System.out.println("");
    }
  }
}

N      C语言实验——矩阵下三角元素之和（SDUT 1172）

package ll;

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int a[][] = new int[100][100];
    int n;
    n = sc.nextInt();
    int sum = 0;
    for (int i = 1; i <= n; i++) {
      for (int j = 1; j <= n; j++) {
        a[i][j] = sc.nextInt();
        if (i >= j)
          sum += a[i][j];
      }
    }
    System.out.println(sum);
  }
}