Renesas TM V.3.20A Especificaciones descargar pdf (Pagina 55)

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101

Renesas Technology, Tools FAQs

Last Updated: July 21, 2000

Document Number: 01051232_e

When I specify command option -fextend_to_int and compile my file, the calculation result is sometimes different from what I

expected. Why is that?

When the compiler sees this command option, the compiler extends char type variables to int type variables. Therefore, when the

following example is compiled with this option, the result will be different from the normal result.

[Example program]

main()

{

unsigned char c=0xff,cc=0x00;

if(c!=~cc)

printf("Ok\n"); /* with -fextend_to_int */

else

printf("NG\n"); /* without -fextend_to_int */

}

In this example, the compiler extends the char type variable to the int type variable first, then the compiler performs operator ~. As a

result, the upper side is always FF. Therefore, the result of this "if" comparison is TRUE.

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Renesas TM V.3.20A Especificaciones Pagina 55

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