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Altera_Forum's avatar
Altera_Forum
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20 years ago

char takes 4 bytes?

char test_char=-5; printf("test_char %x,%x,%x\n",test_char,(char)test_char,(unsign char)test_char); We expect the output was: >test_char fb,fb,fb but we got : >test_char fffffffb,ffff...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Hi, paolo

Look the below codes, we got the result what we not expected, either. 

char test_char=-5;
unsigned char good=0xfb;
if(test_char==good){
  printf("they are equal\n");
}else{
  printf("they are not equal\n");
}
if(test_char==0xfb){
  printf("test_char is 0xfb\n");
}else{
  printf("test_char is not 0xfb\n");
}

the result:

>they are not equal

>test_char is not 0xfb

what should we do? As we should modify lots of codes what these error.