Renesas TM V.3.20A Dokumentacja Pobierz pdf (Strona 98)

100

101

Renesas Technology, Tools FAQs

Last Updated: July 5, 2001

Document Number: 01062001_e

I made the following program in C.

if (x++ == 5){

aaasub();

}

Upon examining the generated codes, it seems that variable x (the operand) is compared with 5 before the variable increment. Is the

following description necessary in order to have variable x compared with 5 after the variable increment?

x++;

if (x ==5){

aaasub();

}

There are two ways to use the increment (++) and decrement (--) operators: preceding the operand (pre-) or following the operand

(post-).

pre-increment / pre-decrement: Increment or decrement operator precedes the variable (the operand).

post-increment / post-decrement: Increment or decrement follows the variable (the operand).

The program you made uses a post-increment, and the comparison of variable x and 5 is performed before the variable increment.

To perform the desired operation, you have to use a pre-increment for variable x.

if (++x == 5){

aaasub();

}

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