// This program demonstrates the impact of cross-representations 
// by asking the user to enter a floating point value
// and then printing it out under different interpretations

#include <stdio.h>

void printlong(long longvalue);

int main(void)
{
	float number;
	long *longptr;
	float *floatptr;
	void *voidptr;

	voidptr = longptr = floatptr = &number;

	printf("Enter a floating point number: ");
	scanf("%f", voidptr);

	printf("float is %i bytes and long is %i bytes.\n",
		sizeof(float), sizeof(long));
	printf("number as a float: %f\n", *(float *)voidptr);
	printf("number as a long : %li (decimal)\n", *(long *)voidptr);
	printf("number as a long : 0x%lX (hex)\n", *(long *)voidptr);

	printf("number as a float: %f\n", number);
	printf("number as a long : %li (decimal)\n", number);
	printf("number as a long : 0x%lX (hex)\n", number);

	printf("number as a float: %f\n", *longptr);
	printf("number as a long : %li (decimal)\n", *longptr);
	printf("number as a long : 0x%lX (hex)\n", *longptr);

	printf("number as a float: %f\n", *floatptr);
	printf("number as a long : %li (decimal)\n", *floatptr);
	printf("number as a long : 0x%lX (hex)\n", *floatptr);

	printf("\n");
	printf("Passed as a long:\n");
	printlong(*longptr);
	printf("Passed as a float:\n");
	printlong(*floatptr);
	printf("Passed as a void cast to long:\n");
	printlong(*(long *)voidptr);
	printf("Passed as a void cast to float:\n");
	printlong(*(float *)voidptr);
	printf("Passed as a float cast to long:\n");
	printlong(*(long *)floatptr);
	printf("Passed as a long cast to float:\n");
	printlong(*(float *)longptr);
	return(0);
}

void printlong(long longvalue)
{
	printf("number as a long : %li (decimal)\n", longvalue);
	printf("number as a long : 0x%lX (hex)\n", longvalue);
	return;
}