ex2.1

// ex_2.1
#include <stdio.h>

int main(void)
{
    printf("Tim Wu\n");
    printf("Tim\nWu\n");
    printf("Tim ");
    printf("Wu\n");

    return 0;
}

ex2..2

// ex_2.2
#include <stdio.h>

int main(void)
{
    printf("NAME: Tim Wu\n");
    printf("ADDRESS: Jing An District Shanghai China\n");

    return 0;
}
 

ex2.3

// ex_2.3
#include <stdio.h>

int main(void)
{
    int age = 0;
    int days = 0;
    printf("How old are you?\n");
    scanf("%d", &age);
    days = age * 365;
    printf("You've been lived for %d days.", days);

    return 0;
}

ex2.4

// ex_2.4
#include <stdio.h>

void jolly(void)
{
    printf("For he's a jolly good fellow!\n");
}

void deny(void)
{
    printf("Which nobody can deny!\n");
}

int main(void)
{
    jolly();
    jolly();
    jolly();
    deny();

    return 0;
}
 

ex2.5

// ex_2.5
#include <stdio.h>

void br(void)
{
    printf("Brazil, Russia");
}

void ic(void)
{
    printf("India, China");
}

int main(void)
{
    br();
    printf(", ");
    ic();
    printf("\n");
    ic();
    printf(",\n");
    br();

    return 0;
}

ex2.6

// ex_2.6
#include <stdio.h>


int main(void)
{
    int toes = 10;
    int toes_twice = toes * 2;
    int toes_squared = toes * toes;

    printf("The value of toes is %d.\n", toes);
    printf("The value of twice toes is %d.\n", toes_twice);
    printf("The value of squared toes is %d.\n", toes_squared);

    return 0;
}
 

ex2.7

// ex_2.7
#include <stdio.h>

void printSmile(int n)
{
    int i;
    for (i = 0; i < n; i++)
        printf("Smile!");
    printf("\n");
}

int main(void)
{
    printSmile(3);
    printSmile(2);
    printSmile(1);
    return 0;
}

ex2.8

// ex_2.8
#include <stdio.h>
void two(void);
void one_three(void);

int main(void)
{
    printf("starting now:\n");
    one_three();
    printf("done.\n");

    return 0;
}

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

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