Code:
	#include <stdio.h>
#define CFRATIO (9.0/5.0)
#define FCRATIO (5.0/9.0)
int main (void)
{
/* Local Definitions */
  int i;  
        
  /* Statements */
  printf("Celcius -> Farenheit Conversion Table\n");
  for ( i = 0; i <= 100; i++) {
    /* Centigrade to Fahrenheit */
    printf("%.2f\t", (CFRATIO * i) + 32);
    if( ( (i+1) % 10 ) == 0 ) {
      printf("\n");
    }
  }
  printf("\nFahrenheit -> Celcius Conversion Table\n" );
  for ( i = 32; i <= 212; i++) {
    /* Fahrenheit to Centigrade */
    printf("%.2f\t", (i - 32) * FCRATIO );
    if( ( (i+1) % 10 ) == 0 ) {
      printf("\n");
    }
  }
  printf("\n");
  return 0;
}
 Cleaned up your code a bit and fixed a few bugs. 
