根据成绩返回等级-if与switch实现

来源：互联网发布：数据加密解密编辑：程序博客网时间：2024/06/14 07:34

成绩>= 90 返回A；成绩>= 80 返回B；成绩>= 70 返回C；成绩>= 60 返回D；不及格返回E；

package com.majing;public class GradeRank {public static void main(String[] args) {// TODO Auto-generated method stub////rank1 test ————————————————————////边界值//float grade = 99f;//System.out.println(rank1(grade));//grade = 100f;//System.out.println(rank1(grade));//grade = 101f;//System.out.println(rank1(grade));//grade = -1f;//System.out.println(rank1(grade));//grade = 0f;//System.out.println(rank1(grade));//grade = 1f;//System.out.println(rank1(grade));////语句覆盖//grade = 65f;//System.out.println(rank1(grade));//grade = 72f;//System.out.println(rank1(grade));//grade = 83f;//System.out.println(rank1(grade));//grade = 95f;//System.out.println(rank1(grade));//grade = 51f;//System.out.println(rank1(grade));////rank2 test ————————————————————//边界值int grade2 = 99;System.out.println(rank1(grade2));grade2 = 100;System.out.println(rank1(grade2));grade2 = 101;System.out.println(rank1(grade2));grade2 = -1;System.out.println(rank1(grade2));grade2 = 0;System.out.println(rank1(grade2));grade2 = 1;System.out.println(rank1(grade2));//语句覆盖grade2 = 65;System.out.println(rank1(grade2));grade2 = 72;System.out.println(rank1(grade2));grade2 = 83;System.out.println(rank1(grade2));grade2 = 95;System.out.println(rank1(grade2));grade2 = 51;System.out.println(rank1(grade2));}//if实现public static char rank1(float grade){char result = 0;if(grade < 0 || grade > 100){System.out.println("Illegal input");}else if(grade >= 90){result = 'A';}else if(grade >= 80){result = 'B';}else if(grade >= 70){result = 'C';}else if(grade >= 60){result = 'D';}else{result = 'E';}return result;}//switch 实现public static char rank2(int grade){int tenDigit = grade/10;char result = 0;switch (tenDigit){case 10:case 9:result = 'A';break;case 8:result = 'B';break;case 7:result = 'C';break;case 6:result = 'D';break;default:if(tenDigit >= 0 && tenDigit < 6){result = 'E';}else{System.out.println("Illegal Input");}}return result;}}

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