string to integer to double

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main()
{
  char word[80];
    
  puts("\nEnter an integer string: ");
  gets(word);
  
  /* atoi() : converts its argument, a series of numbers used 
   * as a string, in to an integer value and returns it. The
   * statement after the conversion statement shows how unsigned
   * long i has been converted and can now be used.
  */ 
  
  unsigned long i = atoi(word);
  
  printf("\nThe string '%s' converted to integer is %u.\n", word, i);
  printf("The converted string squared is %u.\n", i * i);
  
  /* atol(): converts its string argument to a double value. The 
   * statement following the conversion shows how it can be used.
  */ 
  
  double f = atol(word);
  
  printf("\nThe string '%s' converted to double is %.2f.\n", word, f);
  printf("The converted string divided by 3 is %.3f.\n\n", f / 3);
  
  /* play and enjoy! */
 
  system("PAUSE");	
  return 0;
}
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