Java基础语法2

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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 + "
" + 'B' + " " + b + "
" + 'C' + " " + c + "
" + 'D' + " " + d + "
" + 'E'
				+ " " + e + "
");
	}
}

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);
	}
}