/*  	file: float_to_ieee.c    
	Displays the internal representation of a
	single precision floating point number on MIPS
	RISC R2000, R3000, and R4000 series processors

	Available via anonymous ftp on sgi.sgi.com    
	in the directory ~ftp/support/Pipeline

	To compile:
	% cc float_to_ieee.c -o float_to_ieee

	Sample run:
	% ./float_to_ieee
	Enter decimal floating point number: -3.5
	C0 60 00 00 (hex)
	11000000 01100000 00000000 00000000 (binary) 
*/

main() 

{    

	/* loop counter */    
	int           ii;
	/* mask to print out binary representation */   
	unsigned int  bit_mask = 0x80000000;
	/* structure for printing the hex 
	/* representation */
	struct byte_representation {        
		unsigned int byte1:  8;        
		unsigned int byte2:  8;        
		unsigned int byte3:  8;        
		unsigned int byte4:  8;    
	} *byte_number;
	/* union maps the floating point */
	/* number as a */    
	union fp_representation {          
		/* float, */          
		float        float_rep;         
		/* int, and byte  */          
		unsigned int int_rep;    
	} my_number;
	byte_number = (struct byte_representation *) \
		&my_number.float_rep;
	printf ("\nEnter decimal floating point ");    
	printf ("number: ");    
	scanf ("%f", &my_number.float_rep);
	/* PRINT NUMBER IN DECIMAL */   
	printf ("\n%f = \n", my_number.float_rep);
	/* PRINT NUMBER IN HEX */    
	printf ("   ");    
	if (byte_number->byte1 < 0xa) {         
		/* print leading zero */         
		printf ("0");        
		printf ("%x ", byte_number->byte1);    
	} 
	else {         
		printf ("%x ", byte_number->byte1);    
	}
	if (byte_number->byte2 < 0xa) {         
		/* print leading zero */         
		printf ("0");         
		printf ("%x ", byte_number->byte2);    
	} 
	else {         
		printf ("%x ", byte_number->byte2);    
	}
	if (byte_number->byte3 < 0xa) {         
		/* print leading zero */         
		printf ("0");        
		printf ("%x ", byte_number->byte3);    
	} 
	else {         
		printf ("%x ", byte_number->byte3);    
	}
	if (byte_number->byte4 < 0xa) {         
		/* print leading zero */         
		printf ("0");        
		printf ("%x ", byte_number->byte4);    
	} 
	else {         
		printf ("%x ", byte_number->byte4);   
	}   
	printf ("(hex) \n");
	/* PRINT NUMBER IN BINARY */
	printf ("  ");    
	for (ii=0;ii<32;ii++) {        
		if ((ii%8) == 0) printf (" ");         
		if ((my_number.int_rep & bit_mask) == 0)              
			printf ("0");         
		else              
			printf ("1");
		bit_mask = bit_mask >> 1;    
	}    
	printf (" (binary) \n\n"); 
}