I got the following error message while compiling the C code:
error: 'for' loop initial declarations are only allowed in C99 mode
note: use option -std=c99 or -std=gnu99 to compile your code
What does it mean?
How to fix it?
Answer
You have done this:
for (int i=0;i<10;i++) {
And you need to change it to this:
int i;
for (i=0;i<10;i++) {
Or, as the error says,
use option -std=c99 or -std=gnu99 to compile your code.
Update copied from Ryan Fox's answer:
gcc -std=c99 foo.c -o foo
Or, if you're using a standard makefile, add it to the CFLAGS variable.