Programming Forums > Application Development > C++

Cipher · Mar 15th, 2005, 9:41 AM

Sorry I am stuck on this guys. But specifically I am having trouble figureing out how functions return vaules.Could someone expalin to me the proceesss and maybe give some src concering funcs?

Berto · Mar 15th, 2005, 10:42 AM

(Toggle Plain Text)

int function(){

   do some stuff;
   return (int);

}

basically you declare the function as a type in the example above int, then you use the return command to return an int value, so you could have a function that returns a value you have added together, or -1 if there is an error or the number is invalid etc.

http://cplus.about.com/od/beginnerct.../aa061102a.htm

that might help i didnt read it but it should help i would write smoe more but i think someone can say it better esp in that tutorial.

Xero · Mar 15th, 2005, 11:05 AM

To expand...

For example, you might want to create a function to calculate the area of a circle. The function would take in the radius as an arguement, and would return the area as return value to the what ever called the function. Returning values are used for if there was a calculation involved or if you want to signal a flag. The reason you would use a return value is because any changes made in the function locally, meaning they do not change the actual variables and are gone once the function ends. Returning a value helps retrieve calculations, etc. Ofcourse, there are alternative options such as pointers, but just ignore it for now as they would probably be even more confusing.

Cipher · Mar 15th, 2005, 3:12 PM

hmm...I'll dwell on it..Once again..Thanks guys for the wonderful help/

Benoit · Mar 15th, 2005, 3:34 PM

When a function returns something its used like a variable, for example

(Toggle Plain Text)

x=sum(a,b);

(Toggle Plain Text)

int sum(int a, int b)
{
int sum;
sum=a+b;

return sum;
}

myfunction returns the value of sum and assigns it to variable x

Mar 15th, 2005, 9:41 AM	#1
Cipher Hobbyist Programmer Join Date: Feb 2005 Location: /home/cipher Posts: 123 Rep Power: 4	Function Help(again sorry) Sorry I am stuck on this guys. But specifically I am having trouble figureing out how functions return vaules.Could someone expalin to me the proceesss and maybe give some src concering funcs? __________________ And there was much rejoicing... Yay....

Mar 15th, 2005, 10:42 AM	#2
Berto Programming Guru Join Date: Aug 2004 Posts: 1,022 Rep Power: 6	(Toggle Plain Text) int function(){ do some stuff; return (int); } int function(){ do some stuff; return (int); } basically you declare the function as a type in the example above int, then you use the return command to return an int value, so you could have a function that returns a value you have added together, or -1 if there is an error or the number is invalid etc. http://cplus.about.com/od/beginnerct.../aa061102a.htm that might help i didnt read it but it should help i would write smoe more but i think someone can say it better esp in that tutorial.

Mar 15th, 2005, 11:05 AM	#3
Xero Hobbyist Programmer Join Date: Dec 2004 Location: a cardboard box Posts: 118 Rep Power: 4	To expand... For example, you might want to create a function to calculate the area of a circle. The function would take in the radius as an arguement, and would return the area as return value to the what ever called the function. Returning values are used for if there was a calculation involved or if you want to signal a flag. The reason you would use a return value is because any changes made in the function locally, meaning they do not change the actual variables and are gone once the function ends. Returning a value helps retrieve calculations, etc. Ofcourse, there are alternative options such as pointers, but just ignore it for now as they would probably be even more confusing. __________________ ...

Mar 15th, 2005, 3:12 PM	#4
Cipher Hobbyist Programmer Join Date: Feb 2005 Location: /home/cipher Posts: 123 Rep Power: 4	hmm...I'll dwell on it..Once again..Thanks guys for the wonderful help/ __________________ And there was much rejoicing... Yay....

Mar 15th, 2005, 3:34 PM	#5
Benoit Expert Programmer Join Date: Sep 2004 Location: Ontario, Canada Posts: 555 Rep Power: 5	When a function returns something its used like a variable, for example (Toggle Plain Text) x=sum(a,b); x=sum(a,b); (Toggle Plain Text) int sum(int a, int b) { int sum; sum=a+b; return sum; } int sum(int a, int b) { int sum; sum=a+b; return sum; } myfunction returns the value of sum and assigns it to variable x __________________ Johnny was a chemist's son but Johnny is no more, for what Johnny thought was H2O was H2SO4

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Programming Forums > Application Development > C++

Function Help(again sorry)