C primer plus（编程练习）2.12

4.

#include <stdio.h>

void jolly(void);
void deny(void);
int main(void)
{
    jolly();
    jolly();
    jolly();
    deny();
	return 0;
}
void jolly(void)
{
    printf("For he is a jolly good fellow\n");
}
void deny(void)
{
    printf("Which nobady can deny\n");
}

5.

#include <stdio.h>
void br(void);
void ic(void);
int main(void)
{
	br();
	printf(",");
	ic();
	printf("\n");
	ic();
	printf("\n");
	br();

	return 0;
}
void br(void)
{
	printf("Brazil,Russia");
}
void ic(void)
{
	printf("India,China");
}

6.

#include <stdio.h>

int main()
{
	int toes;
	toes = 10;
	int toes2;
	toes2 = 2*toes;
	int toes_square;
	toes_square = toes*toes;
	printf("toes=%d,2*toes=%d,toes square=%d\n",toes,toes2,toes_square);

	return 0;
}

7.

#include <stdio.h>
void smile();
int main()
{
	smile();
	smile();
	smile();
	printf("\n");
	smile();
	smile();
	printf("\n");
	smile();

	return 0;
}
void smile()
{
	printf("Smile!");
}

8.

#include <stdio.h>
void one_three();
void two();
int main()
{
	printf("starting now:\n");
	one_three();
	printf("done!");

	return 0;
}

void one_three()
{
	printf("one\n");
	two();
	printf("three\n");
}

void two()
{
	printf("two\n");
}