Difference between pre-increment and post-increment

[Kasya]

Difference between x++ and ++x;
Difference between x-- and --x;

[Banfa]

++x is pre-increment and x++ is post-increment that is in the first x is incremented before being used and in the second x is incremented after being used.

This is most easily demonstrated with a small program

#include <stdlib.h>
#include <stdio.h>
 
int main(int argc, char **argp)
{
    int x = 5;
 
    printf("x=%d\n", ++x);
    printf("x=%d\n", x++);
    printf("x=%d\n", x);
 
    return EXIT_SUCCESS;
}

The output of this program is

x=6
x=6
x=7

In the first printf statement x is incremented before being passed to printf so the value 6 is output, in the second x is passed to printf (so 6 is output) and then incremented and the 3rd printf statement just shows that post increment following the previous statement by outputting x again which now has the value 7.

[Kasya]

Difference between x-- and --x;

[Banfa]

I would have thought you could have modified the program I posted to find out, where ++ is increment -- is decrement, apart from that that act in a similar manor.

[Kasya]

Thanks!!!!!

[maan]

Thanks!!!!!

an other method
m+=1; is post increment
or m-=1 is post decrement

[JosAH]

an other method
m+=1; is post increment
or m-=1 is post decrement

Have you tried it? The value of the expression "m+=1" equals "m+1" so it is
more like a pre increment.

kind regards,

Jos

[maan]

yes i tried practicaly " m+1" is eqal to "m+=1"

"++m" is pre increment

if you have any other idea please reply

i'll wait 4 ur +ive response

Regardz Maan....

[JosAH]

yes i tried practicaly " m+1" is eqal to "m+=1"

"++m" is pre increment

Erm, yes that's what I wrote; you wrote that m+= 1 had the same value as
the *post* increment expression (see above).

kind regards,

Jos

[mistiq]

thank u buddy...i had the same question and ur answer really worked out:)