• PTA JAVA02 基础语法1

    7-1 改错题01

    1. public class Main {
    2.     public static void main(String[] args) {
    3.         //int i;
    4.         int k=100;
    5.         int j=1;
    6.  
    7.         System.out.printf("j is " + j + " and k is " + k);
    8.     }
    9. }

    **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

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args) {
    5.         Scanner reader = new Scanner(System.in);
    6.         System.out.printf("Hello " + reader.next());
    7.     }
    8. }

    7-3 计算三角形面积。

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args) {
    5.         int a, b, c;
    6.         Scanner reader = new Scanner(System.in);
    7.         double p;
    8.         a = reader.nextInt();
    9.         b = reader.nextInt();
    10.         c = reader.nextInt();
    11.         p = (a + b + c) / 2;
    12.         double s = Math.sqrt(p * (p - a) * (p - b) * (p - c));
    13.         System.out.printf("%.1f", s);
    14.     }
    15. }

    7-4 java基本语法-整数四则运算

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args){
    5.         Scanner reader = new Scanner(System.in);
    6.         int a, b;
    7.         a = reader.nextInt();
    8.         b = reader.nextInt();
    9.         double c;
    10.         c = (double)a / (double)b;
    11.         System.out.println(a + b);
    12.         System.out.println(a - b);
    13.         System.out.println(a * b);
    14.         System.out.printf("%.3f", c);
    15.     }
    16. }

    7-5 计算摄氏温度

    1. public class Main {
    2.     public static void main(String[] args){
    3.         System.out.printf("100 37.78");
    4.     }
    5. }

    **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

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args){
    5.         Scanner reader = new Scanner(System.in);
    6.         double PI = 4 *(1.0 -1.0/3 +1.0/5 -1.0/7 +1.0/9 -1.0/11 +1.0/13);
    7.         System.out.printf("%.16f", PI);
    8.     }
    9. }

    **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

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args){
    5.         Scanner reader = new Scanner(System.in);
    6.         int n;
    7.         n = reader.nextInt();
    8.         int a = n % 10;
    9.         int b = n / 10 % 10;
    10.         int c = n / 100;
    11.         System.out.println(a + b + c);
    12.     }
    13. }

    7-8 jmu-Java-02基本语法-05-浮点数的精确计算 

    1. import java.math.BigDecimal;
    2. import java.util.Scanner;
    3.  
    4. public class Main {
    5.     public static void main(String[] args) {
    6.         Scanner reader = new Scanner(System.in);
    7.         String a, b;
    8.         while(reader.hasNext()){
    9.             a = reader.next();
    10.             b = reader.next();
    11.             BigDecimal a1 = new BigDecimal(a);
    12.             BigDecimal b1 = new BigDecimal(b);
    13.             System.out.println(b1.add(a1));
    14.             System.out.println(a1.multiply(b1));
    15.         }
    16.         reader.close();
    17.     }
    18. }

    7-9 sdut-sel-0-输出学生个人信息（II）

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args) {
    5.         Scanner reader = new Scanner(System.in);
    6.         while(reader.hasNext()){
    7.             int a = reader.nextInt();
    8.             if(a == 0){
    9.                 System.out.printf("学号：202000101\n");
    10.                 System.out.printf("姓名：张三\n");
    11.                 System.out.printf("专业：计算机科学与技术\n");
    12.                 System.out.printf("班级：计科2001\n");
    13.                 System.out.printf("联系方式：18966666666\n");
    14.             }
    15.             else if(a == 1){
    16.                 String id, name, major, cla, tel;
    17.                 reader.nextLine();
    18.                 id = reader.nextLine();
    19.                 name = reader.nextLine();
    20.                 major = reader.nextLine();
    21.                 cla = reader.nextLine();
    22.                 tel = reader.nextLine();
    23.                 System.out.printf("学号：%s\n", id);
    24.                 System.out.printf("姓名：%s\n", name);
    25.                 System.out.printf("专业：%s\n", major);
    26.                 System.out.printf("班级：%s\n", cla);
    27.                 System.out.printf("联系方式：%s\n", tel);
    28.             }
    29.         }
    30.         reader.close();
    31.     }
    32. }

    7-10 sdut-JAVA判断合法标识符

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args){
    5.         Scanner reader = new Scanner(System.in);
    6.         while(reader.hasNext()){
    7.             String str;
    8.             int f = 1;
    9.             char ch;
    10.             str = reader.nextLine();
    11.             for(int i = 0; i < str.length(); i++){
    12.                 ch = str.charAt(i);// 取出下标为i的那个数
    13.                 if(i == 0){
    14.                     if(Character.isJavaIdentifierStart(ch)){// 判断该字符是否可以作为标识符的第一个字符
    15.                         f = 1;
    16.                     }else{
    17.                         f = 0; break;
    18.                     }
    19.                 }else{
    20.                     if(Character.isJavaIdentifierPart(ch)){// 判断该字符是否可以作为标识符的一部分
    21.                         f = 1;
    22.                     }else{
    23.                         f = 0; break;
    24.                     }
    25.                 }
    26.             }
    27.             if(f == 1) System.out.println("true");
    28.             else System.out.println("false");
    29.         }
    30.         reader.close();
    31.     }
    32. }

    7-11 sdut-数据类型-1-求班级男女生比例

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args) {
    5.         Scanner reader = new Scanner(System.in);
    6.         int n, m;
    7.         n = reader.nextInt();
    8.         m = reader.nextInt();
    9.         double male, female;
    10.         male = (double) n / (n + m);
    11.         female = (double) m / (n + m);
    12.         System.out.printf("%.2f%% ", male * 100);
    13.         System.out.printf("%.2f%%", female * 100);
    14.         reader.close();
    15.     }
    16. }

    7-12 以英里计的平均速度

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args) {
    5.         Scanner reader = new Scanner(System.in);
    6.         int m, s, d;
    7.         m = reader.nextInt();
    8.         s = reader.nextInt();
    9.         d = reader.nextInt();
    10.         double time =(double) (m * 60 + s) / 3600;
    11.         double v;
    12.         v = (double) d / 1.6 / time;
    13.         System.out.printf("%.2f", v);
    14.         reader.close();
    15.     }
    16. }

    7-13 sdut-数据类型-2 应用勾股定理，了解世界灿烂文明

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args) {
    5.         Scanner reader = new Scanner(System.in);
    6.         while(reader.hasNext()){
    7.             double a, b;
    8.             a = reader.nextDouble();
    9.             b = reader.nextDouble();
    10.             double c = java.lang.Math.sqrt(a * a + b * b);
    11.             System.out.printf("%.2f\n", c);
    12.         }
    13.         reader.close();
    14.     }
    15. }

    7-14 sdut-数据类型-3 计算飞行员到最近机场的距离

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args) {
    5.         Scanner reader = new Scanner(System.in);
    6.         while(reader.hasNext()){
    7.             double h, degree;
    8.             h = reader.nextDouble();
    9.             degree = reader.nextDouble();
    10.             double ans = h / Math.tan(degree);
    11.             System.out.printf("%.2f\n", ans);
    12.         }
    13.         reader.close();
    14.     }
    15. }

    7-15 sdut-数据类型-4 第七次全国人口普查数据分析 

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args) {
    5.         Scanner reader = new Scanner(System.in);
    6.         System.out.print("7206 5.38% 0.54%\n");
    7.         System.out.print("2.62 0.48\n");
    8.         System.out.print("17.95% 63.35% 18.70%\n");
    9.         System.out.print("15.47%\n");
    10.         reader.close();
    11.     }
    12. }

    **噗嗤 

    7-16 学投资

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args) {
    5.         Scanner reader = new Scanner(System.in);
    6.         int m = reader.nextInt();
    7.         double p = reader.nextDouble();
    8.         int n= reader.nextInt();
    9.         double ans1 =m * Math.pow((1 + p), n);
    10.         double ans2 = m + m * p * n;
    11.         double ans3 = ans1 - ans2;
    12.         System.out.printf("%d ", Math.round(ans1));
    13.         System.out.printf("%d ", Math.round(ans2));
    14.         System.out.printf("%d", Math.round(ans3));
    15.         reader.close();
    16.     }
    17. }

    7-17 Reversed 3-Digit-Number

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args) {
    5.         Scanner reader = new Scanner(System.in);
    6.         int n;
    7.         n = reader.nextInt();
    8.         int a, b, c;
    9.         a = n % 10;
    10.         b = n / 10 % 10;
    11.         c = n / 100;
    12.         System.out.printf("%d", a * 100 + b * 10 + c);
    13.         reader.close();
    14.     }
    15. }

    7-11 计算钱币

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args) {
    5.         Scanner reader = new Scanner(System.in);
    6.         double moy;
    7.         moy = reader.nextDouble();
    8.         int a = (int) moy / 10;
    9.         int b = (int) (moy - a * 10) / 5;
    10.         int c = (int) (moy - a * 10 - b * 5);
    11.         int d = (int) (moy * 10 % 10 / 5);// 使小数点后的一位变成个位
    12.         int e = (int) (moy * 10 % 10 % 5);
    13.         int f = (int) (moy * 100 % 10) / 2;
    14.         int g = (int) (moy * 100 % 10) % 2;
    15.         System.out.println(a + " 张十元");
    16.         System.out.println(b + " 张五元");
    17.         System.out.println(c + " 张一元");
    18.         System.out.println(d + " 个五角");
    19.         System.out.println(e + " 个一角");
    20.         System.out.println(f + " 个贰分");
    21.         System.out.println(g + " 个壹分");
    22.         reader.close();
    23.     }
    24. }

    7-13 推算星期

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args) {
    5.         Scanner reader = new Scanner(System.in);
    6.         int w, n;
    7.         w = reader.nextInt();
    8.         n = reader.nextInt();
    9.         int x = n % 7;
    10.         int d;
    11.         if(x > (7 - w)){
    12.             d = x + w - 7;
    13.         }else{
    14.             d = x + w;
    15.         }
    16.         System.out.println(d);
    17.         reader.close();
    18.     }
    19. }

    7-14 Time Difference

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args) {
    5.         Scanner reader = new Scanner(System.in);
    6.         int h1, m1, h2, m2;
    7.         h1 = reader.nextInt();
    8.         m1 = reader.nextInt();
    9.         h2 = reader.nextInt();
    10.         m2 = reader.nextInt();
    11.         int hh = h2 - h1;
    12.         int mm = 0;
    13.         if(m2 < m1){
    14.             mm = 60 + m2 - m1;
    15.             hh--;
    16.         }else{
    17.             mm = m2 - m1;
    18.         }
    19.         System.out.printf("%d %d", hh, mm);
    20.         reader.close();
    21.     }
    22. }

    7-15 逆序的三位数

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args){
    5.         Scanner reader = new Scanner(System.in);
    6.         int n;
    7.         n = reader.nextInt();
    8.         int a = n % 10;
    9.         int b = n / 10 % 10;
    10.         int c = n / 100;
    11.         System.out.printf("%d", a * 100 + b * 10 + c);
    12.         reader.close();
    13.     }
    14. }

    7-16 sdut-入门-三个整数和、积与平均值

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args){
    5.         Scanner reader = new Scanner(System.in);
    6.         int a, b, c;
    7.         a = reader.nextInt();
    8.         b = reader.nextInt();
    9.         c = reader.nextInt();
    10.         double d = (double) (a + b + c) / 3;
    11.         System.out.printf("%d %d %.2f", a + b + c, a * b * c, d);
    12.         reader.close();
    13.     }
    14. }

    7-17 sdut-入门-买糖果

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args){
    5.         Scanner reader = new Scanner(System.in);
    6.         int n;
    7.         n = reader.nextInt();
    8.         int m = n * 10 / 3;
    9.         int x = n * 10 % 3;
    10.         System.out.printf("%d %d", m, x);
    11.         reader.close();
    12.     }
    13. }

    7-18 sdut-计算球体积

    1. import java.util.Scanner;
    2.  
    3. public class Main {
    4.     public static void main(String[] args){
    5.         Scanner reader = new Scanner(System.in);
    6.         double r;
    7.         double pi = 3.1415926;
    8.         while(reader.hasNext()){
    9.             r = reader.nextDouble();
    10.             double v = (4 * pi * Math.pow(r, 3)) / 3;
    11.             System.out.printf("%.3f\n", v);
    12.         }
    13.         reader.close();
    14.     }
    15. }

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  • 原文地址：https://blog.csdn.net/qq_62846665/article/details/126669222