reverse.c

# include <stdio.h>

int main() {

 char str[] = "Reverse me!";

 int length;

 for (length = 0; str[length] != '\0'; length++) {

 }

 printf("length => %d chars\n", length);

 int j, k, i;
 char c;

  for (i = 0, k = length - 1; i < k; i++, k--){
	 	c = str[k];    
	  str[k] = str[i];
	  str[i] = c;
	}

 printf("reversed => %s\n", str);

 return 0;
}