#include <90s8515.h> 
#include c:\cvavr\inc\stdio.h
#include c:\cvavr\inc\ftoa.h  
#include c:\cvavr\inc\atof.h

char instr[10], outstr[10];
float fltin, fltout;
 
//======================================
float getfloat()
//get chars, print them back, handle backspace,
//add decimal if it is not in input (to fix atof bug)
{ 
	char input_dec;		//flag for existing decimal
	char in_str[32];  	//The input to be converted to a float
    char current_char;	//the last char to be inputted
	char in_count;		//the current char number
	
	input_dec=0;
	in_count=0;   
	
	while ( (current_char=getchar()) != '\r' )  //carriage return
	{    
		putchar(current_char);
		
		if (current_char == 0x08)	//backspace  
			--in_count;
		else   
			in_str[in_count++]=current_char; 
			
		if (current_char == '.')   //set decimal flag 
			input_dec=1; 	
	}    
	
    putchar(current_char);  //emit carriage return
    putchar('\n'); 			//line feed makes output nicer
	if ( input_dec == 0 ) in_str[in_count++]='.';  //add decimal if necessary
    in_str[in_count]=0x00;	//null terminate
    return atof(in_str);    		
}   

//======================================
void main(void)
  { 
  UCR = 0x10 + 0x08 ;
  UBRR = 25 ;
   
  putsf("\r\n pgm start\r\n");
  
  while(1)
  	{     
  	putsf("Enter a float.\r"); 
   	fltin = getfloat();	
   	ftoa(fltin/2,2,outstr);
   	printf("input/2=%s\r\n\r\n",outstr);
  	}
  }