void GetFile(FILE* pt,char *pointer) { int counter=0,c=0; char chars; while ((chars=fgetc(pt))!=EOF) { if (chars=='\n') { counter++; } } fseek(pt,0,SEEK_SET); srand(time(NULL)); c = rand() % counter; counter=0; while(counter
MacBook Pro (13-inch, Mid 2012), OS X Mountain Lion (10.8.2)
First, format the code so we can read it.
First, format the code so we can read it.
fgetc returns an int, not a char. A char will never equal EOF. Please don't attempt to read newlines with C.
Why won't a char = EOF? You can't tell it from a valid one, but the conversion of char to int might equal EOF, right?
For the OP: There is also feof() which will explicitly check for EOF.
From the _C Programming FAQ_:
"If type char is signed and if EOF is defined as usual as -1, then the character with the decimal value 255 will be sign extended and will compare equal to EOF, prematurely terminating the input.
If type char is unsigned, an EOF value will be truncated and will *not* be recognised as EOF, resulting in infinite input."
While it's not good programing practice and heaven knows there is a lot wrong with the bit of code that can be seen, it will work.
int main(int argc, const char * argv[])
{
@autoreleasepool {
FILE *fp;
char chars;
if ((fp = fopen("/Users/frank/text.txt", "r" )) == NULL) {
NSLog(@"Open Failed");
return(-1);
}
while ((chars = fgetc(fp)) ) {
if (chars == '\n')
NSLog(@"new line\n");
else if (chars == EOF) {
NSLog(@"end of file\n");
return(EXIT_SUCCESS);
} else
NSLog(@"*%c*",chars);
}
NSLog(@"end of while");
}
return0;
}
produces
2013-03-09 13:40:38.402 ASCfgetcTST[10809:303] *a*
2013-03-09 13:40:38.404 ASCfgetcTST[10809:303] *b*
2013-03-09 13:40:38.404 ASCfgetcTST[10809:303] *s*
2013-03-09 13:40:38.404 ASCfgetcTST[10809:303] *c*
2013-03-09 13:40:38.405 ASCfgetcTST[10809:303] *e*
2013-03-09 13:40:38.405 ASCfgetcTST[10809:303] *f*
2013-03-09 13:40:38.406 ASCfgetcTST[10809:303] new line
2013-03-09 13:40:38.406 ASCfgetcTST[10809:303] *h*
2013-03-09 13:40:38.406 ASCfgetcTST[10809:303] *i*
2013-03-09 13:40:38.407 ASCfgetcTST[10809:303] *j*
2013-03-09 13:40:38.407 ASCfgetcTST[10809:303] *k*
2013-03-09 13:40:38.407 ASCfgetcTST[10809:303] new line
2013-03-09 13:40:38.408 ASCfgetcTST[10809:303] end of file
from a file of
cat text.txt
abscef
hijk
One nice thing about computers, you can ask them somehting and they will always tell you the truth (as far as their workings go)
can someone show me the problem with this code
