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PTA JAVA02 基础语法1

news 来源：原创 2024/5/19 1:00:06

7-1 改错题01

public class Main {
    public static void main(String[] args) {
        //int i;
        int k=100;
        int j=1;

        System.out.printf("j is " + j + " and k is " + k);
    }
}

**很搞笑的一件事：把错误代码复制到IDEA中有自动报错0.0

7-2 你好

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        System.out.printf("Hello " + reader.next());
    }
}

7-3 计算三角形面积。

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        int a, b, c;
        Scanner reader = new Scanner(System.in);
        double p;
        a = reader.nextInt();
        b = reader.nextInt();
        c = reader.nextInt();
        p = (a + b + c) / 2;
        double s = Math.sqrt(p * (p - a) * (p - b) * (p - c));
        System.out.printf("%.1f", s);
    }
}

7-4 java基本语法-整数四则运算

import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner reader = new Scanner(System.in);
        int a, b;
        a = reader.nextInt();
        b = reader.nextInt();
        double c;
        c = (double)a / (double)b;
        System.out.println(a + b);
        System.out.println(a - b);
        System.out.println(a * b);
        System.out.printf("%.3f", c);
    }
}

7-5 计算摄氏温度

public class Main {
    public static void main(String[] args){
        System.out.printf("100 37.78");
    }
}

**我们亲切地称呼它为“面向答案（样例）编程” ——直接输出答案就行

7-6 计算PI值

import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner reader = new Scanner(System.in);
        double PI = 4 *(1.0 -1.0/3 +1.0/5 -1.0/7 +1.0/9 -1.0/11 +1.0/13);
        System.out.printf("%.16f", PI);
    }
}

**同上。。也可以直接输出结果

7-7 求一个三位正整数各位数字之和

import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner reader = new Scanner(System.in);
        int n;
        n = reader.nextInt();
        int a = n % 10;
        int b = n / 10 % 10;
        int c = n / 100;
        System.out.println(a + b + c);
    }
}

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