C语言详解(第五版)第二章程序设计项目答案

C语言详解（第五版）程序设计项目答案第二章

1.编写一个程序，以每英里0.35的费率计算一个售货员的里程偿还金。程序中要求与用户进行如下方式的交互。

#include

#include

int main(void)

{float mile_1,mile_2,miles,consume,payment;

printf("MILEAGE REIMBURSEMENT CALCULATOR\n");

printf("Enter begainning odometer reading>\n");

scanf("%f",&mile_1);

printf("Enter endding odometer reading>\n");

scanf("%f",&mile_2);

printf("Enter consume per mile>\n");

scanf("%f",&consume);

miles=mile_2-mile_1;

payment=miles*consume;

printf("You traveled%f miles.At%f per mile,your reimbursement

is%f",miles,consume,payment);

system("pause");

return(0);

}

2.编写一个程序，用于辅助设计水力发电大坝。提示用户输入大坝高度，以及水流量。如果水由重力所做的功有90%转化为电能，测算会有多少M瓦的功率。

#include

#include

int main(void)

{double density,weight,gravitational_acceleration,

efficiency,height,water_flow_rate,work,electricity_power;

printf("Please type in the density of water>");

scanf("%lf",&density);

printf("Please type in the gravitational_acceleration>");

scanf("%lf",&gravitational_acceleration);

printf("Please type in the height of the water>");

scanf("%lf",&height);

printf("Please type in the efficiency of the transformation\nfrom water to electricity>");

scanf("%lf",&efficiency);

printf("Please type in the water_flow_rate>");

scanf("%lf",&water_flow_rate);

weight=density*water_flow_rate;

work=weight*height*gravitational_acceleration;

electricity_power=work*efficiency/1000000;

printf("The electric energy production is%fW",electricity_power);

system("pause");

return0;

}

3.编写一个程序，用于预测冰箱内的温度，断电后经过的时间是给定的。温度公式：。要求程序提示用户输入改时间，它以整数小时和分钟表示。需要注意的是，经历的世间应该转化为小时。

#include

#include

int main(void)

{double time,temperature;

int hour,minute;

printf("Please type in the time，include hour and minute.For example230(2void space 30)>");

scanf("%d%d",&hour,&minute);

time=hour+minute/60;

temperature=time*time*4/(time+2)-20;

printf("The temperature of the refrigerator is%f℃?",temperature);

system("pause");

return0;

}

4.将华氏温度转换成摄氏温度。

#include

#include

int main(void)

{int fahrenheit;

double centigrade;

printf("Please type in temperature in fahrenheit>");

scanf("%d",&fahrenheit);

centigrade=(fahrenheit-32)*5/9;

printf("The temperature%d in fahrenheit equals to the temperature%f in centigrade

",fahrenheit,centigrade);

system("pause");

return0;

}

5.编写一个程序，将两个数作为输入数据，并显示它们的和差积商；

#include

#include

int main(void)

{double x,y;

double sum;

double difference;

double product;

double quotient;

printf("Please type in x and y>");

scanf("%lf%lf",&x,&y);

sum=x+y;

difference=x-y;

product=x*y;

quotient=x/y;

printf("the sum of x and y is%.2f",sum);

printf("the difference of x and y is%.2f",difference);

printf("the product of x and y is%.2f",product);

printf("the quotient of x and y is%.2f",quotient);

system("pause");

return0;

}

6.如果要使一门课程获得所希望的分数等级没那么预测一下，在期末考试中所需要的分数。编写一个程序实现该目标，程序与用户按如下方式交互：

#include

#include

int main(void)

{char rank;

double minimum_average,current_average,score,percentage;

printf("Please enter the desired rank>");

scanf("%c",&rank);

printf("Please enter the minimum average required>");

scanf("%lf",&minimum_average);

printf("Please enter the current average in course>");

scanf("%lf",¤t_average);

printf("Please enter how much the final counts as a percentage of the course grade>"); scanf("%lf",&percentage);

score=minimum_average/(percentage/100)-current_average*(100-percentage)/percentage ;

printf("You need a score of%.2f on the final to get a%c",score,rank);

system("pause");

return0;

}

7.编写一个程序，计算在给定燃油的加仑数和房屋内燃油的效率后，可以给房屋释放多少热量。

#include

#include

int main(void)

{double volume,energy,efficiency;

printf("Please enter the volume of oil>");

scanf("%lf",&volume);

printf("Please enter the efficiency of oil>");

scanf("%lf",&efficiency);

energy=volume/42*5800000*efficiency;

printf("The oil provide%.2fBtu energy for the house",energy);

system("pause");

return0;

}

9．计算剪草坪的时间

#include

#include

int main(void)

{double length,width,velocity;

double area,time;

printf("Please enter the length and width>");

scanf("%lf%lf",&length,&width);

area=length*width;

printf("Please enter the velocity of mowing>");

scanf("%lf",&velocity);

time=area/velocity;

printf("The time consumed for mowing lawns is%.2fs",time);

system("pause");

return0;

}

10.编写一个程序，显示两个分数乘积后的分子与分母，并且显示该乘积的百分比。#include

#include

int main(void)

{double

numerator1,denominator1,numerator2,denominator2,numerator,denominator,percentage; printf("Please enter the numerator1>");

scanf("%lf",&numerator1);

printf("Please enter the denominator1>");

scanf("%lf",&denominator1);

printf("Please enter the numerator2>");

scanf("%lf",&numerator2);

printf("Please enter the denominator2>");

scanf("%lf",&denominator2);

numerator=numerator1*numerator2;

denominator=denominator1*denominator2;

percentage=numerator/denominator*100;

printf("The numerator of the two fractions'product is%.2f\n",numerator);

printf("The denominator of the two fractions'product is%.2f\n",denominator);

printf("The percentage of the two fractions'product is%.2f%\n",percentage);

system("pause");

return0;

}

12.勾股三元组的建立

#include

#include

int main(void)

{double m,n,side1,side2,hypotenuse;

printf("Please enter the number of m>");

scanf("%lf",&m);

printf("Please enter the number of n>");

scanf("%lf",&n);

side1=m*m-n*n;

side2=2*m*n;

hypotenuse=m*m+n*n;

printf("The side1=%.2f\n",side1);

printf("The side2=%.2f\n",side2);

printf("The hypotenuse=%.2f\n",hypotenuse);

system("pause");

return0;

}

13.编写一个程序，计算喷气式飞机从航空母舰上弹射出发后的加速度。#include

#include

int main(void)

{double acceleration,velocity,velocity_start,distance;;

printf("Please enter the velocity of the plane(the unit is km/hr)>");

scanf("%lf",&velocity_start);

velocity=velocity_start*1000/3600;

printf("Please enter the distance of ejection(the unit is m)>");

scanf("%lf",&distance);

acceleration=2*velocity*velocity/distance;

printf("The acceleration=%.2fm/s2\n",acceleration);

system("pause");

return0;

}