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162Debug.md
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## Exercise 1 |
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enter an integer number: 100 |
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**Exercise 1: Debugging in Java** |
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Mit: |
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**1. Open the program Uebung1.java in the editor** |
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input: 100, Schleifenvariable: 2, Ergebnis 0 |
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The program Uebung1.java is a simple program that reads in a natural number and checks whether it is a prime number. A prime number is a number that is only divisible by 1 and itself. |
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nextInt = 45 |
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**2. Start the program multiple times ("run as Java Application") and enter different natural numbers.** |
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i = 2 , nextInt= 45 |
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When you start the program for the first time, it will display a prompt where you can enter a natural number. Enter any number, for example 12. The program will then output "number 12 passed check: true". |
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resume |
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Start the program again now and enter a different number, for example 10. The program will then output "number 10 passed check: false". |
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i = 3 |
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**3. Activate lines 36-38 by removing the two slashes at the beginning of the line** |
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input: 45, Schleifenvariable: 2, Ergebnis 1 |
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If you activate lines 36-38, the following outputs will be added: |
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input: 45, Schleifenvariable: 3, Ergebnis 0 |
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* "input: <input value>, loop variable: <loop variable>, result <result>" |
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// |
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Start the program again and enter any number. You should now see the following outputs: |
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nextInt = 47 , i = 2 |
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``` |
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enter an integer number: 12 |
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input: 12, loop variable: 2, result 0 |
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number 12 passed check: true |
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``` |
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input: 47, Schleifenvariable: 2, Ergebnis 1 |
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**4. Set a breakpoint on line 35** |
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input: 47, Schleifenvariable: 3, Ergebnis 2 |
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A breakpoint is a point in the code where the execution of the program will be paused. |
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input: 47, Schleifenvariable: 4, Ergebnis 3 |
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**5. Start the program as usual** |
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If we start the program now, it will be paused on line 35. You can now check the values of the variables. |
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In this case, the values of the variables are as follows: |
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* `nextInt`: The input value entered by the user. |
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* `i`: The current loop variable. |
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* `result`: The result of the division of `nextInt` by `i`. |
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**6. Start the program in debug mode and enter the number 45** |
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To start the program in debug mode, select "debug as Java Application" from the context menu. |
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Now enter the number 45. The program will be paused on line 35. |
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**7. Note the contents of the variables** |
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In this case, the values of the variables are as follows: |
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* `nextInt`: 45 |
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* `i`: 2 |
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* `result`: 0 |
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**8. Continue running the program until the next breakpoint ("resume")** |
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Press the F8 key to continue running the program. The program will be paused on line 36. |
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**9. Note the contents of the variables** |
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In this case, the values of the variables are as follows: |
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* `nextInt`: 45 |
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* `i`: 3 |
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* `result`: 15 |
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**10. Continue running the program until the next breakpoint ("resume")** |
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Press the F8 key again to continue running the program. The program will be paused on line 37. |
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**11. Note the contents of the variables** |
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In this case, the values of the variables are as follows: |
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* `nextInt`: 45 |
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* `i`: 4 |
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* `result`: 9 |
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**12. Terminate the debugger ("Terminate")** |
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Press the F10 key to terminate the debugger. |
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// |
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--- |
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## Exercise 2 |
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Vorher |
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**Exercise 2: Debugging in Java** |
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**1. Open the program Uebung2.java in the editor** |
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The program Uebung2.java is a simple program that reads in a natural number and checks whether it is a prime number. A prime number is a number that is only divisible by 1 and itself. |
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**2. Start the program multiple times ("run as Java Application") and enter different natural numbers.** |
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When you start the program for the first time, it will display a prompt where you can enter a natural number. Enter any number, for example 12. The program will then output "number 12 passed check: true". |
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Start the program now again and enter a different number, for example 10. The program will then output "number 10 passed check: false". |
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**3. Set a breakpoint on line 40** |
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A breakpoint is a point in the code where the execution of the program will be paused. |
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**4. Start the program as usual** |
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If you start the program now, it will be paused on line 40. You can now check the values of the variables. |
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**5. Start the program in debug mode ("debug as Java Application") and enter the number 45** |
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To start the program in debug mode, select "debug as Java Application" from the context menu. |
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Now enter the number 45. The program will be paused on line 40. |
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**6. Note the contents of the variables** |
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In this case, the values of the variables are as follows: |
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* `nextInt`: 45 |
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* `count`: 2 |
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**7. Note the number of entries in the Debug View** |
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The Debug View contains a list of variables and their values. In this case, the Debug View contains two entries: |
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enter an integer number: 100 |
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* `nextInt`: 45 |
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* `count`: 2 |
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number 100 passed check: false |
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**8. Continue running the program one step at a time ("step over").** |
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mit Zahl 45: |
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Press the F8 key to continue running the program one step at a time. The program will be paused on line 41. |
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nextInt = 23 |
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**9. In which line is the debugger?** |
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count = 3 |
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The debugger is on line 41. |
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- in welcher Zeile steht der Debugger? |
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**10. Note the number of entries in the Debug View** |
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Zeile 40 |
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The Debug View still contains two entries: |
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- Notieren Sie die Anzahl der Einträge in der |
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* `nextInt`: 45 |
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* `count`: 2 |
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private boolean checkNumber(int nextInt) { // nextInt = 16 |
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**11. Terminate the debugger ("Terminate")** |
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nextInt = nextInt - (nextInt / count); // nextInt = 16 , count = 4 |
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Press the F10 key to terminate the debugger. |
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count++; // count = 4 |
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**12. Continue running the program one step at a time ("step into").** |
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return checkNumber(nextInt); // nextInt = 16 |
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Press the F7 key to continue running the program one step at a time. The program will be paused on line 40. |
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- in welcher Zeile steht der Debugger? |
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**13. In which line is the debugger?** |
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Zeile 40 |
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The debugger is back on line 40. |
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- Notieren Sie die Anzahl der Einträge in der Debug View |
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**14. Note the number of entries in the Debug View** |
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private boolean checkNumber(int nextInt) { // nextInt = 23 |
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The Debug View now contains three entries: |
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nextInt = nextInt - (nextInt / count); // nextInt = 23, count = 3 |
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* `nextInt`: 45 |
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* `count`: 2 |
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* `return`: false |
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count++; // count = 3 |
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**15. Terminate the debugger ("Terminate")** |
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return checkNumber(nextInt); // nextInt = 23 |
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Press the F10 key to terminate the debugger. |
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