京东自营 618 + 国补 iPhone 历史最低价
Java 迷你命令
迷你命令行计算器
实例源码：
源代码：
执行
执行中...
x
1
2
import java.util.Arrays;/*N o w J a v a . c o m*/3
4
5
public class Main {6
7
public static void main(String[] args) {8
9
System.out.println(Arrays.toString(args));10
11
if (!(args.length == 3 && args[1].length() == 1)) {12
13
printUsage();14
15
return;16
17
}18
19
double n1 = 0.0;20
21
double n2 = 0.0;22
23
try {24
25
n1 = Double.parseDouble(args[0]);26
27
n2 = Double.parseDouble(args[2]);28
29
} catch (NumberFormatException e) {30
31
System.out.println("Both operands must be a number");32
33
printUsage();34
/*35
时 代 J a v a - nowjava.com 提 供36
*/37
38
return; // Stop the program here39
40
}41
42
43
String operation = args[1];44
45
double result = compute(n1, n2, operation);46
47
48
// Print the result49
50
System.out.println(args[0] + args[1] + args[2] + "=" + result);51
52
}53
54
55
public static double compute(double n1, double n2, String operation) {56
57
double result = Double.NaN;58
59
switch (operation) {60
61
case "+":62
63
result = n1 + n2;64
65
break;66
67
case "-":68
69
result = n1 - n2;70
71
break;72
73
case "*":74
75
result = n1 * n2;76
77
break;78
79
case "/":80
81
result = n1 / n2;82
83
break;84
85
default:86
87
System.out.println("Invalid operation:" + operation);88
89
}90
91
return result;92
93
}94
95
96
public static void printUsage() {97
98
System.out.println("Usage: java Main expr");99
/**代码未完, 请加载全部代码(NowJava.com).**/执行结果：
本文系作者在时代Java发表，未经许可，不得转载。如有侵权，请联系nowjava@qq.com删除。
编辑于
关注时代Java