Post-Conditions
Help Questions
AP Computer Science A › Post-Conditions
double square(double n){
return n*n;
}
What MUST be true immediately after the above code snippet has run?
The result will be a positive number.
The result will be a negative number.
The result will be stored in a new variable.
The value of the input parameter changes.
It is impossible to tell.
Explanation
Squaring a real number will always produce a positive number. The result does not have to be stored in a new variable; it could be a value that is only needed for a one-off expression, thus, not worthy to be stored in memory. Lastly, since the input was passed by value and not by reference, its initial value will stay the same.
double square(double n){
return n*n;
}
What MUST be true immediately after the above code snippet has run?
The result will be a positive number.
The result will be a negative number.
The result will be stored in a new variable.
The value of the input parameter changes.
It is impossible to tell.
Explanation
Squaring a real number will always produce a positive number. The result does not have to be stored in a new variable; it could be a value that is only needed for a one-off expression, thus, not worthy to be stored in memory. Lastly, since the input was passed by value and not by reference, its initial value will stay the same.
double square(double n){
return n*n;
}
What MUST be true immediately after the above code snippet has run?
The result will be a positive number.
The result will be a negative number.
The result will be stored in a new variable.
The value of the input parameter changes.
It is impossible to tell.
Explanation
Squaring a real number will always produce a positive number. The result does not have to be stored in a new variable; it could be a value that is only needed for a one-off expression, thus, not worthy to be stored in memory. Lastly, since the input was passed by value and not by reference, its initial value will stay the same.