Write the definition of a function isPositive, which receives an integer parameter and returns true if the parameter is positive, and false otherwise.
So if the parameter 's value is 7 or 803 or 141 the function returns true . But if the parameter 's value is -22 or -57, or 0, the function returns false .
My Code:
bool isPositive ( int x ) {
if ( x > 0 )
{
return true;
}
else {
return false ;
}
}
Defining Functions- c programming?
2016-10-04 11:55 am
回答 (2)
2016-10-04 12:12 pm
✔ 最佳答案
That should work just fine. A shorter way to write it is to use the ?: conditional operator:return x > 0 ? true : false;
An expression of the form A ? B : C will evaluate expression A. If it is nonzero ("true") then B will be the result and expression C will not be evaluated. Otherwise, C will be the result and expression B will not be evaluated.
Some programmers prefer to put the condition (the "A" part) in parentheses:
return (x > 0) ? true : false;
That helps if you're not used to C's operator precedence rules ("order of operations").
If you are using the bool, true and false definitions from <stdbool.h>, the code is even easier:
return x > 0;
The > operator returns an integer 0 (false) if the test fails or 1 (true) if the test succeeds. There's no need to do anything else with it. If you want to emphasize that the result is a bool value, then:
return (bool)(x > 0);
2016-10-04 3:51 pm
bool isPositive(int x){
return x>0;
}
your code can be better:
bool isPositive ( int x ) {
if ( x > 0 )
return true; // the else is not necessary since execution of the function stops at the return
return false;
}
return x>0;
}
your code can be better:
bool isPositive ( int x ) {
if ( x > 0 )
return true; // the else is not necessary since execution of the function stops at the return
return false;
}
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