Spaces:
Running
Running
File size: 2,139 Bytes
765c82e |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 |
Write the method
int calculate(int num1, int num2, String operator)
...which takes as parameters two integers and a string.
The string has 4 possible values: "+", "-", "*" or "/"
The method calculates and returns the operator-defined arithmetic operation on the numbers.
Examples on method calls:
public static void main(String[] parameters){
System.out.println(calculate(4, 5, "+"));
System.out.println(calculate(8, 2, "-"));
System.out.println(calculate(3, 4, "*"));
System.out.println(calculate(10, 2, "/"));
}
Program outputs:
9
6
12
5
import java.util.Random;
public class Test{
public static void main(String[] args){
final Random r = new Random();
Object[][] p = {{1,4,"+"}, {121,145,"-"}, {5,8,"*"}, {9,3,"/"}, {99,77,"-"},
{2,4,"*"}, {20,5,"/"}, {1,2,"-"}, {9,3,"*"}};
for (Object[] pa : p) {
System.out.print("Testing with parameters ");
System.out.println(pa[0] + ", " + pa[1] + ", " + pa[2]);
int tulos = calculate((Integer) pa[0], (Integer) pa[1], (String) pa[2]);
System.out.println("Result: " + tulos);
System.out.println("");
}
}
public static int calculate(int num1, int num2, String operator) {
int result;
if (operator.equals("+")) {
result = num1 + num2;
}
else if (operator.equals("-")) {
result = num1 - num2;
}
else if (operator.equals("*")) {
result = num1 * num2;
}
else if (operator.equals("/")) {
result = num1 / num2;
}
else {
result = 0;
}
return result;
}
}
Testing with parameters 1, 4, +
Result: 5
Testing with parameters 121, 145, -
Result: -24
Testing with parameters 5, 8, *
Result: 40
Testing with parameters 9, 3, /
Result: 3
Testing with parameters 99, 77, -
Result: 22
Testing with parameters 2, 4, *
Result: 8
Testing with parameters 20, 5, /
Result: 4
Testing with parameters 1, 2, -
Result: -1
Testing with parameters 9, 3, *
Result: 27
|