Can anyone convert this c function to 6502 asm

int main(void)
{
int i ;
inx=0;
for(i=0;i<10; I++)
{
x++
}
return (0);
}

It is faulty C.
Your variables "inx", "I" and "x" are undeclared.
Your "X++" line does not end in a semicolon.
Even if it worked it would loop but save no files and write no output
so the only effect would be to consume CPU time.

Using the X register as the loop variable you would want something
like this.

    LDX #0             # load 0 into X register
LOOP                   # label
                       # space for loop content if desired
    INX                # add 1 to X (where 255+1=0)
    CPX #11
    BNE LOOP

CPX #11            # compare X register to 11
    BNE LOOP           # Branch if Not Equal (using result of compare operation)
                       # to the LOOP variable which must be sufficiently close
                       # in the code because long jumps are specified differently

so that converst the entire thing into 6502? i wouf of thought it
would of needed to be longer

Writing English like that, how could you have expected to write good code?

THe assembly code has a bug in it.
The original C "for" statement was: for (i=0; i< 10; i++) { .... }
I.e. 10 times through the loop, with zero being the first time.
Note that i (not I) should never equal 10 (and neither should x).
So the BNE #11 statement should be instead BNE #10.

Oh Oh.
I mean CPX #11 should be CPX #10. Then BNE.