Weird problems in C debugging

./opt1.sub.h: In function ‘tcf’:
./opt1.sub.h:234: error: stray ‘\357’ in program
./opt1.sub.h:234: error: stray ‘\274’ in program
./opt1.sub.h:234: error: stray ‘\213’ in program
./opt1.sub.h:234: error: expected ‘)’ before ‘zp’

I searched the web, the problem is"
It means you have some goofy characters on that line. They are probably invisible. Try deleting the line entirely and retyping it."----from cprogramming.com