Program to reverse a string--segmentation fault!

Code:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>


int
main(void)
{
  char* original = (char*) malloc(80 * sizeof(char));
  char reverse[80];
  char temp[80]; //same as char* temp
  char *ptr;


  printf("Input: ");
  fgets(original, 80, stdin);
  ptr = strtok(original, " ");


  while(strtok(original, " \n") != NULL) //until end of line
  {
    ptr = strtok(NULL, " \n");
    sprintf("%s", ptr, reverse); //THIS CAUSES THE ERROR
    strcpy(reverse, temp);
  }//while


  printf("%s", reverse);


  free(original);
  
  return 0;
}//int main(void)

I am trying to write this program to reverse a string. If I were to give it the string "birds and bees," it would give me bees and birds in response. This program does not work, though, and results in a segmentation fault. What is my error and how do I fix it?

Thank you.

> sprintf("%s", ptr, reverse); //THIS CAUSES THE ERROR
sprintf(3): formatted output conversion - Linux man page
Considering that the first parameter is supposed to be the string to WRITE into, what can you expect when you pass "%s"?

Code:

char temp[80]; //same as char* temp

No, that's not true. Pointers and arrays are not the same. Read Question 6.2 of the C-FAQ.

Bye, Andreas