How does pointer increment compare with index increment in C

Question

consider the following two code:

void PrintLetter(char *src)
{
 while(*src != '\0')
 {
   printf("%c",*src);
   src++;
 }
}

and

void PrintLetter(char *src)
{
 int i;
 for(i=0;src[i];i++)
  printf("%c",src[i]);
}

Is there any performance difference between the two?

Answer 1

None whatsoever. The compiler will perform its optimizations regardless of the form you are writing. The underlying assembly code is the same.