Hello,

How can I ignore a comment line [which follows a special symbol say, "#"] from an input file for example,

#Matrix size
3
#Number of rotations
10
#Matrix
1 1 1
1 1 1
1 1 1

Thank you in advance,
Kit Carzon.

Hello,

I am writing some programs in Fortran 77 for educational purposes. For some programs, the input files have a lot of data and I like to mark them with comments using special symbols for ex., "#"

Can any one suggest me a way to make the program ignore the comment line which is followed by the special symbol?

For example,

#Matrix size ---comment line-----
3
#Number of rotations ---comment line-----
10
#Matrix elements ---comment line-----
1 1 1
1 1 1
1 1 1

Thank you in advance,
Kit Carzon.

Hello,

below is what I'm using with C. Just call the function once before the "while" or "for" loop or so, and then after every "fscanf()" etc. inside the loop, e.g.:

skip_cmt('#',fp);

The comment character specified by the first argument then may be placed virtually anywhere it makes sense (like TeX's %). Enjoy!

Cheers,

---LvS

#define EAT_WHITE_SPACE \
while ((c=getc(fp))=='\n'||c==' '|| \
c=='\t'||c=='\r'||c=='\v'||c=='\f') ;

void skip_cmt(int z, FILE *fp)
{
int c;
EAT_WHITE_SPACE
if (c==z) {
do {
while ((c=getc(fp))!='\n') ;
EAT_WHITE_SPACE
} while (c==z);
(void)ungetc(c,fp);
}
else
(void)ungetc(c,fp);
}