java语言程序设计基础篇第一章程序练习答案_java基础篇第一章答案-优快云博客

本文链接：https://blog.youkuaiyun.com/ImJavaKrisWu/article/details/80723577

本文提供了多个Java编程示例，包括简单的字符串输出、循环打印、数学计算、几何形状的周长和面积计算等。通过这些示例，读者可以了解基本的Java语法和流程控制结构。

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public class a1 {
    public static void main(String[] args){
        System.out.println("Welcome to Java");
        System.out.println("Welcome to Computer Science");
        System.out.println("Programming is fun");
    }
}

public class a2 {
    public static void main(String[] args){
        for(int i =0;i<5;i++){
            System.out.println("Welcome to Java");
        }
    }
}

public class a3 {
    public static void main(String[] args){
        System.out.println("   J    A    V     V    A ");
        System.out.println("   J   A A    V   V    A A");
        System.out.println("J  J  AAAAA    V V    AAAAA");
        System.out.println(" JJ  A     A    V    A     A");

    }
}

public class a4 {
    public static void main(String[] args){
        System.out.println("a    a^2    a^3");
        for(int i1=1;i1<5;i1++) {
            int i2 = i1 * i1;
            int i3 = i1 * i1 * i1;
            if (i2 < 10) {
                System.out.println(i1 + "    " + i2 + "      " + i3);
            }
            else{
                System.out.println(i1 + "    " + i2 + "     " + i3);
            }
        }
    }
}

public class a5 {
    public static void main(String[] args){
        System.out.println((9.5*4.5-2.5*3)/(45.5-3.5));
    }
}

public class a6 {
    public static void main(String[] args){
        int sum =0;
        for(int i=1;i<10;i++){
            sum+=i;
            if(i<9) {
                System.out.print(i + "+");
            }
            else{
                System.out.print(i+"=");
            }
        }
        System.out.print(sum);
    }
}

public class a7 {
    public static void main(String[] args){
        double p1=4.0*(1.0-1.0/3.0+0.2-1.0/7.0+1.0/9.0-1.0/11.0);
        double p2=4.0*(1.0-1.0/3.0+0.2-1.0/7.0+1.0/9.0-1.0/11.0+1.0/13.0);
        System.out.print(p1+"\n"+p2);
    }
}

public class a8 {
    public static void main(String[] args){
        double radious=5.5;
        double perimeter=radious*2*Math.PI;
        double area=Math.pow(radious,2)*Math.PI;
        System.out.print(perimeter+"\n"+area);
    }
}

public class a9{
    public static void main(String[] args){
        double width=4.5;
        double height=7.9;
        double perimeter=2*(width+height);
        double area=height*width;
        System.out.print(perimeter+"\n"+area);
        }
    }

public class a10 {
    public static void main(String[] args){
        double min=45.5;
        double distance=14;
        double speed=distance/1.6*(min/60);
        System.out.print(speed);
    }
}