Assertions: Difference between revisions
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(Created task with Java, maybe C and C++ later if no one else gets to it) |
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int a; |
int a; |
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//...input or change a here |
//...input or change a here |
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assert a == 42;//throws an |
assert a == 42;//throws an AssertionError when a is not 42 |
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assert a == 42 : "Error message"; //throws an AssertionError |
assert a == 42 : "Error message"; //throws an AssertionError |
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//when a is not 42 with "Error message" for the message |
//when a is not 42 with "Error message" for the message |
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//the error message can be any non-void expression |
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}</lang> |
}</lang> |
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=={{header|Python}}== |
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<lang python>a = 5 |
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#...input or change a here |
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assert a == 42 # throws an AssertionError when a is not 42 |
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assert a == 42, "Error message" # throws an AssertionError |
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# when a is not 42 with "Error message" for the message |
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# the error message can be any expression</lang> |
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Revision as of 05:36, 4 February 2009
You are encouraged to solve this task according to the task description, using any language you may know.
Assertions are a way of breaking out of code when there is an error or an unexpected input. Some languages throw exceptions and some treat it as a break point.
Show an assertion in your language by asserting that an integer variable is equal to 42.
Java
<lang java5>public static void main(String[] args){
int a;
//...input or change a here
assert a == 42;//throws an AssertionError when a is not 42
assert a == 42 : "Error message"; //throws an AssertionError
//when a is not 42 with "Error message" for the message
//the error message can be any non-void expression
}</lang>
Python
<lang python>a = 5
- ...input or change a here
assert a == 42 # throws an AssertionError when a is not 42 assert a == 42, "Error message" # throws an AssertionError
# when a is not 42 with "Error message" for the message
# the error message can be any expression</lang>