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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main(String[] args) {
  11. 	    String[] operators = {"-", "+", "*"};
  12. 	    String operator;
  13. 	    Random r = new Random();
  14. 	    int result = -1;
  15.  
  16. 		for (int j = 0; j < 10; j++) {
  17. 		    for (int i = 0; i < 3; i++) {
  18. 		        int randNum = r.nextInt(9) + 1;
  19. 		        if (i != 0) {
  20. 		        	operator = operators[r.nextInt(operators.length)];
  21. 		            System.out.print(operator);
  22. 		        	result = calculate(result, randNum, operator);
  23. 		        }
  24. 		        else {
  25. 		        	result = randNum;
  26. 		        }
  27. 		        System.out.print(randNum);
  28. 		    }
  29. 		    System.out.println("=" + result);
  30. 		}
  31. 	}
  32. 	public static int calculate(int operand1, int operand2, String operator) {
  33. 		switch (operator) {
  34. 			case "+":
  35. 				return operand1 + operand2;
  36. 			case "-":
  37. 				return operand1 - operand2;
  38. 			case "*":
  39. 				return operand1 * operand2;
  40. 			default:
  41. 				throw new RuntimeException();
  42. 		}
  43. 	}
  44. }
Success #stdin #stdout 0.07s 380224KB
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stdin
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Standard input is empty
stdout
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7-8-7=-8
7+6*2=26
3*2*4=24
1-1+1=1
1*9+9=18
4+7*3=33
8*4-2=30
5*8+7=47
6+1+1=8
7*2-5=9
https://ideone.com/a085Y5
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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