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i++ and ++i
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Join Date: Dec 2005
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He's referring to the way you write them when you wish to overload the operators.
http://www.parashift.com/c++-faq-lit...html#faq-13.14
However,
1. He's 3 years too late with the information.
2. It's off topic as the thread was about how the prefix and postfix forms affect integers, and not about how to write overload versions.
http://www.parashift.com/c++-faq-lit...html#faq-13.14
However,
1. He's 3 years too late with the information.
2. It's off topic as the thread was about how the prefix and postfix forms affect integers, and not about how to write overload versions.
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Originally Posted by Tekmaven™ 
//Lets declare i, and set it equal to 4.
int i = 4;
//Now say their is a function nammed goFetch(int), and we wanted to pass an increment of i to it
//i = 4 before this code gets touched, the value 4 would be passed, and then i would become 5
goFetch(i++);
//i = 4 before this code gets touched, i gets incrimented before anything else (and becomes 5), and the value 5 would be passed
goFetch(++i);
So, ++i means to incriment first then give the incrimented value, and i++ means to give the original value, then incriment.
Hi,
As i++ is used in a statement, then the valude of i in the statement, remains same ie unincremented. But after the statement, this is incremented.
When ++i, is used then it is incremented with in the statement it self.
bye
hi
when inside a loop for example
for(i=0;i<10;i++);
here the loop starts from 0,
and in the case of ++i;
the loop starts from 1,
in the former the assignment is before increment
in the later the assignment is after i gets incremented
when inside a loop for example
for(i=0;i<10;i++);
here the loop starts from 0,
and in the case of ++i;
the loop starts from 1,
in the former the assignment is before increment
in the later the assignment is after i gets incremented
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Join Date: Aug 2005
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>>and in the case of ++i;
>>the loop starts from 1,
No it doesn't -- the loop still starts with 0 because the i is not incremented until after the iteration of that loop finishes.
>>the loop starts from 1,
No it doesn't -- the loop still starts with 0 because the i is not incremented until after the iteration of that loop finishes.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
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Join Date: Oct 2007
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Newbie Poster
i++ first takes the value of i and then gives the increment----(POST INCREMENT OPERATOR) whereas ++i first gives the increment to the assigned i value---(PRE INCREMENT OPERATOR)
example::: i=6
i++ takes i and then gives increment i.e.,i++=5 but the compiler stores the value as 6 which is not the displayed output
++i gives increment first i.e., ++i=6...
input: enter an int:5
output:5
7
HERE THE VALUE OF ++i IS 7 COZ THE COMPILER STORES THE VALUE OF i++ AS 6...
example::: i=6
i++ takes i and then gives increment i.e.,i++=5 but the compiler stores the value as 6 which is not the displayed output
++i gives increment first i.e., ++i=6...
C Syntax (Toggle Plain Text)
output:5
7
HERE THE VALUE OF ++i IS 7 COZ THE COMPILER STORES THE VALUE OF i++ AS 6...
Last edited by Ancient Dragon; Oct 7th, 2007 at 7:14 am. Reason: add code tags
WTF.. All she asked was the difference between ++i and i++, not such weird details. Can't you just say that, ++i will first increment the value of i and then assign it., while i++ will first assign the value and then increments (so the variable assigned before gets to keep the old value of i).
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Join Date: Aug 2005
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Originally Posted by ChaseVoid
WTF.. All she asked was the difference between ++i and i++, not such weird details.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
xDD Totally, kekeke.. Wonder what they'll throw at us if we ask the difference between a long int and a short int. kekeke
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Don't mean to hijack this thread, but yes there may be a difference, but then again there might not be one also. depends on the compiler, which I'm sure you already know but other readers may not.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
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