#include <stdio.h>      /* C example */
#include <stdlib.h>
#include <ctype.h>      /* for isprint */
#include <math.h>       /* for frexp */

void print_int(int i);  /* function declaration */
void print_char(char c);
void print_double(double d);

int main()
{
	int i = 65;
	char c = 'A';
	double d = 65.0;

	print_int(i);
	print_char(c);
	print_double(d);

	return EXIT_SUCCESS;
}

void print_int(int i)   /* function definition */
{
	printf("%d\n", i);
}

void print_char(char c)
{
	/* Output the character code of c as a non-negative decimal integer. */
	printf("%u", (unsigned char)c);   /* cast to avoid sign extension */
	if (isprint((unsigned char)c)) {
		printf("\t'%c'", c);
	}
	printf("\n");
}

void print_double(double d)
{
	int exponent;
	double mantissa = frexp(d, &exponent);

	printf("%g, mantissa == %g, exponent == %d\n", d, mantissa, exponent);
}