第一章：初识C语言

第一题

#include<stdio.h>
int main(void){
	double inch = 0;
	printf("Please enter the inchs:");
	scanf("%lf", &inch);
	printf("\nThe inch is equal to %lf cm.", 2.64 * inch);
	return 0;
}

第二章：C语言概述

第一题

#include<stdio.h>
int main(void){
	printf("MINT Planetarian\n");
	printf("MINT\nPlanetarian\n");
	printf("MINT ");
	printf("Planetarian\n");
	return 0;
}

第二题

#include<stdio.h>
int main(void){
	printf("My name is: ");
	printf("MINT Planetarian\n");
	printf("I come from ");
	printf("CHINA\n");
	return 0;
}

第三题

#include<stdio.h>
int main(void){
	int old = 21;
	printf("I am %d years old.\n",old);
	printf("I have lived %d days.",365*old);
	return 0;
}

补充：若考虑闰年问题，代码见下：

#include<stdio.h>
int run(int old, int year);

int main(void){
	int old = 21;
	int year = 1999;
	int days;
	printf("I am %d years old.\n",old);
	printf("I have lived %d days.",run(old,year)*366 + (old - run(old,year)) * 365);
	return 0;
} 

int run(int old, int year){
	if(year%4 == 0)
		return old/4 + 1;
	else{
		if(old%4 == 0 || old < 4)
			return old/4;
		else
			return old/4 + 1;
	}	
}

第四题

#include<stdio.h>
void jolly(void);
void deny(void);

int main(void){
	int i=0;
	for(i ;i<3 ;i++)
		jolly();
	deny();
	return 0;
} 

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

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

第五题

#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");
}

第六题

#include<stdio.h>
int main(void){
	int toes = 10;
	printf("num: %d\nsquare: %d\ncube: %d\n", toes, toes*toes, toes*toes*toes);
	return 0;
}

第七题

#include<stdio.h>
void smile(void);

int main(void){
	int i = 0;
	smile();	smile();	smile();
	printf("\n");
	smile();	smile();
	printf("\n");
	smile();
	return 0;
}

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

第八题

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

int main(void){
	printf("starting now:\n");
	onethree();
	printf("done!");
	return 0;
}

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