java实现简单的计算器功能

package cn.com.day02;

 

import java.util.Scanner;

 

import javax.print.attribute.standard.MediaSize.JIS;

 

public class JiSuanQi {

 /*

  * public double sum(double a,double b,double c){ double s=0; s=a+b+c;

  * return s; } public double pjz(double a,double b,double c){ double s=0;

  * s=(a+b+c); s=s/3; return s; }

  */

 /*

  * int m; System.out.println("请输入你要进行计算的科目的数目"); Scanner sn=new

  * Scanner(System.in); m=sn.nextInt();

  * System.out.println("请输入你要计算的成绩,将会进行总分计算......"); float [] sz=new float

  * [m]; for(int f=0;f<m;f++){ Scanner sc=new Scanner(System.in);

  * sz[f]=sc.nextFloat(); } float sum=0; for(int f1=0;f1<m;f1++){

  * sum=sum+sz[f1]; } System.out.println(sum);

  * 

  * JiSuanQi js=new JiSuanQi(); float su=(float) js.sum(a,b,c);

  * System.out.println(su);

  */

 /*

  * int m1; System.out.println("请输入你要进行计算的科目的数目"); Scanner sn1=new

  * Scanner(System.in); m=sn1.nextInt();

  * System.out.println("请输入你要计算的成绩,将会进行总分计算......"); float [] sz1=new float

  * [m]; for(int f=0;f<m;f++){ Scanner sc=new Scanner(System.in);

  * sz1[f]=sc.nextFloat(); } float sum1=0; for(int f1=0;f1<m;f1++){

  * sum1=sum1+sz1[f1]; } System.out.println(sum1/m);

  */

 /*

  * System.out.println("请输入你的三门科目的成绩,以下会进行平均数计算......"); Scanner s=new

  * Scanner(System.in); float a1 = s.nextFloat(); float b1 = s.nextFloat();

  * float c1= s.nextFloat(); JiSuanQi js1=new JiSuanQi();

  * System.out.println("平均数:"+js1.pjz(a1, b1, c1));

  */

 public double sum() {

  int m;

  System.out.println("请输入你要进行计算的科目的数目");

  Scanner sn = new Scanner(System.in);

  m = sn.nextInt();

  System.out.println("请输入你要计算的成绩,将会进行总分计算......");

  float[] sz = new float[m];

  for (int f = 0; f < m; f++) {

   Scanner sc = new Scanner(System.in);

   sz[f] = sc.nextFloat();

  }

  float sum = 0;

  for (int f1 = 0; f1 < m; f1++) {

   sum = sum + sz[f1];

  }

  System.out.println(sum);

  return sum;

 }

 

 public double avg() {

  int m1;

  System.out.println("请输入你要进行计算的科目的数目");

  Scanner sn1 = new Scanner(System.in);

  m1 = sn1.nextInt();

  System.out.println("请输入你要计算的成绩,将会进行平均值计算......");

  float[] sz1 = new float[m1];

  for (int f = 0; f < m1; f++) {

   Scanner sc = new Scanner(System.in);

   sz1[f] = sc.nextFloat();

  }

  float sum1 = 0;

  for (int f1 = 0; f1 < m1; f1++) {

   sum1 = sum1 + sz1[f1];

  }

  System.out.println(sum1 / m1);

  return sum1 / m1;

 }

 

 public static void main(String[] args) {

  for (int g = 0; g < 9; g++) {

   int j = 0;

   System.out.println("请输入指定的数字:0--代表求和,1--代表求平均值");

   Scanner ss = new Scanner(System.in);

   j = ss.nextInt();

   if (j == 1 || j == 0) {

    switch (j) {

    case 0:

 

     JiSuanQi jj = new JiSuanQi();

     jj.sum();

     break;

    case 1:

 

     JiSuanQi js = new JiSuanQi();

     js.avg();

     break;

    default:

     System.out.println("此程序只适用于计算求和与求平均值!!!!");

     break;

    }

   } else {

    System.out.println("请规范输入---0或1");

    continue;

   }

  }

 

 }

}

 

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转载自blog.csdn.net/qq_37591637/article/details/82787065
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