c语言详解(第五版)第四章程序设计项目答案

C语言详解（第五版）第四章程序设计项目答案

1.Keith的Sheet Music需要一个程序来实现其为音乐教师定制的折扣政策。程序提示用户输入购买总额并且表明购买者是不是教师。

#include

#define discount_1 0.12

#define discount_2 0.1

#define tax_rate 0.05

void instruct_purchase(void);

double total(double total_purchase,char a[1]);

int main(void)

{void instruct_purchase(void);

double total(double,char);

double total_purchase,total_payment,total1;

char a;

instruct_purchase();

printf("Please enter the creer teacher(enter t) or not(enter n).>>>\n");

scanf("%c",&a);

printf("Please enter the total purchase.>>>\n");

scanf("%lf",&total_purchase);

total1=total(total_purchase,a);

printf("The total payment is %.2f.",total1);

system("pause");

return(0);}

void instruct_purchase(void)

{printf("This program figure a total bill.");

printf("The tax rate is $%.2f.\n",tax_rate);

printf("The discount of total purchase which is more than 100 dollars is $%.2f.\n",discount_1); printf("The discount of total purchase which is less than 100 dollars is $%.2f.\n",discount_2); printf("Please press or button after typing in each number.\n\n\n");

}

double total(double total_purchase,char a)

{double discount_total,total_payment,tax;

if(a=='t')

if(total_purchase>100)

{discount_total=total_purchase*discount_1;

tax=total_purchase*tax_rate;

total_payment=total_purchase+tax-discount_total;

}

else

{discount_total=total_purchase*discount_2;

tax=total_purchase*tax_rate;

total_payment=total_purchase+tax-discount_total;

}

else

{ tax=total_purchase*tax_rate;

total_payment=total_purchase+tax;

}

return(total_payment);

}

3.罗盘的度数换算为罗盘的方位。

#include

void direction(double angle_degree);

int main(void)

{double angle_degree;

printf("Please enter the angleof the total station.>>>\n");

scanf("%lf",&angle_degree);

printf("The angle of the total station is %.2f??.\n\n\n",angle_degree); direction(angle_degree);

system("pause");

return(0);

}

void direction(double angle_degree)

{double angle;

if (angle_degree==0)

{printf("The direction is east(E).\n\n");

}

if(0

{printf("The direction is north(N) %.2f east(E).\n\n",angle_degree);

}

if (angle_degree==90)

{printf("The direction is north(N).");

}

if(90

{angle=180-angle_degree;

printf("The direction is north(N) %.2f west(W).\n\n",angle);

}

if(angle_degree==180)

{printf("The direction is west(W).\n\n");

}

if(180

{angle=angle_degree-180;

printf("The direction is south(S) %.2f west(W).\n\n",angle);

}

if(angle_degree==270)

{printf("The direction is south(S).\n\n");

}

if(270

{angle=angle_degree-270;

printf("The direction is north(N) %.2f east(E).\n\n",angle);

}

4.编写一个程序根据压缩气囊颜色的第一个字母确定压缩罐的内容。

#include

void color(char fa);

int main(void)

{char fa;

printf("Please enter the first alphabet of the container.>>\n");

scanf("%c",&fa);

color(fa);

system("pause");

return(0);

}

void color(char fa)

{switch(fa)

{case'O':

case'o':

printf("The color suggest the content is ammonia gas.\n\n");

break;

case'B':

case'b':

printf("The color suggest the content is CO.\n\n");

break;

case'Y':

case'y':

printf("The color suggest the content is hydrogen.\n\n");

break;

case'G':

case'g':

printf("The color suggest the content is oxygen.\n\n");

break;

default:

printf("There is not the container.");

}}

5．对地震的理氏数进行描述。

#include

void Richter_scale(double a);

int main(void)

{double a;

printf("Please enter the Richter scale of the earthquake.>>>");

scanf("%lf",&a);

Richter_scale(a);

system("pause");

return(0);

}

void Richter_scale(double a)

{ if(a>0&&a<5.0)

printf("破?坏|ì很¨1小?或¨?者?没?有?D.\n");

else if(a<5.5)

printf("一??些?破?坏|ì.\n");

else if(a<6.5)

printf("严?重?破?坏|ì；ê?墙?会¨￠倒ì1塌¨2.\n");

else if(a<7.5)

printf("灾?难?；ê?房¤?屋Y或¨?者?建?§筑t物?会¨￠倒ì1塌¨2.\n"); else if(a>=7.5)

printf("大?¨?灾?难?；ê?大?¨?部?分¤?建?§筑t物?被à?破?坏|ì.\n"); else

printf("There is not this magnititude of earthquake.\n");

}

（2）switch函数编写

#include

char Richter_scale(double a);

void sf(char b);

int main(void)

{double a;

char b;

printf("Please enter the Richter scale of the earthquake.>>>"); scanf("%lf",&a);

b=Richter_scale(a);

sf(b);

system("pause");

return(0);

}

char Richter_scale(double a)

{ char c;

if(a>0&&a<5.0)

{c='A';

return(c);

}

else if(a<5.5)

{c='B';

return(c);

}

else if(a<6.5)

{c='C';

return(c);

}

else if(a<7.5)

{c='D';

return(c);

}

else if(a>=7.5)

{c='E';

return(c);

}

else if(a<=0)

{c='F';

return(c);

}

void sf(char b)

{switch(b)

{case'A':

printf("破?坏|ì很¨1小?或¨?者?没?有?D。?ê\n");

break;

case'B':

printf("一??些?破?坏|ì。?ê\n");

break;

case'C':

printf("严?重?破?坏|ì；ê?墙?会¨￠倒ì1塌¨2。?ê\n");

break;

case'D':

printf("灾?难?；ê?房¤?屋Y和¨a建?§筑t物?会¨￠倒ì1塌¨2。?ê\n"); break;

case'E':

printf("大?¨?灾?难?；ê?大?¨?部?分¤?建?§筑t物?被à?破?坏|ì。?ê\n"); break;

case'F':

printf("无T该?地ì?震e等ì¨¨级?。?ê\n");

break;

}}

6.判断一个点在哪个象限

#include

void quadrant(double a,double b);

int main(void)

{double a,b;

printf("Please enter the coordinate of the dot.>>");

scanf("%lf %lf",&a,&b);

quadrant(a,b);

system("pause");

return(0);

}

void quadrant(double a,double b)

{if(a==0&&b!=0)

{printf("(%.2f,%.2f) is on the y axis.\n",a,b);

}

if(a!=0&&b==0)

{printf("(%.2f,%.2f) is on the x axis.\n",a,b);

}

if(a>0&&b>0)

{printf("(%.2f,%.2f) is in quadrantⅠ.\n",a,b);

}

if(a>0&&b<0)

{printf("(%.2f,%.2f) is in the quadrant Ⅳ.\n",a,b);

}

if(a<0&&b>0)

{printf("(%.2f,%.2f) is in the quadrant Ⅱ.\n",a,b);

}

if(a<0&&b<0)

{printf("(%.2f,%.2f) is in the quadrant Ⅲ.\n",a,b);

}

7.一年中的某一天问题。

#include

void order(int year,int month,int day,int e);

int leap(int year);

int main(void)

{void order(int,int,int,int);

int leap(int);

int year,month,day,e;

printf("Please enter the date(year month day).>>");

scanf("%d %d %d",&year,&month,&day);

e=leap(year);

order(year,month,day,e);

system("pause");

return(0);

}

int leap(int year)

{int a,b,c,d;

a=year%4;

b=year%100;

c=year%400;

if((a==0&&b==0)||c==0)

{d=1;}

else

{d=0;}

return(d);

}

void order(int year,int month,int day,int e)

{int dayth;

if(e==1)

{if(month==1)

{ dayth=day;