Assertions: Difference between revisions
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Show an assertion in your language by asserting that an integer variable is equal to 42. |
Show an assertion in your language by asserting that an integer variable is equal to 42. |
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=={{header|C}}== |
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<lang c>#include <assert.h> |
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int main(){ |
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int a; |
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/* ...input or change a here */ |
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assert(a == 42); /* aborts program when a is not 42 */ |
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return 0; |
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}</lang> |
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=={{header|Java}}== |
=={{header|Java}}== |
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Revision as of 06:09, 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.
C
<lang c>#include <assert.h>
int main(){
int a; /* ...input or change a here */ assert(a == 42); /* aborts program when a is not 42 */
return 0;
}</lang>
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>