Question

JAVA求助：由键盘输入一个矩形的长和宽，求出这个矩形的周长和面积 该怎么写

Answer 1

public static void main(String[] args) {
       System.out.println("输入长度");
       Double c=new Scanner(System.in).nextDouble();
       System.out.println("输入宽度");
       Double k=new Scanner(System.in).nextDouble();
       System.out.println("面积:"+c*k);
       System.out.println("周长:"+(c+k)*2);
    }

Answer 2

public class Area {
public static void main(String[] args) {

Scanner sc=new Scanner(System.in);
System.out.println("请输入长度：");
double a=sc.nextDouble();
System.out.println("请输入宽度：");
double b=sc.nextDouble();
double c=a*b;
System.out.println("面积为:"+c);
}

}

Answer 3

#include <stdio.h>
int main()
{
    float x, y;
    scanf("%f%f", &x, &y);
    printf("%f\n", x*y);
    return 0;
}