C语言详解(第五版)第三章程序设计项目答案

scanf("%lf",&time); a=deceleration(initial_velocity,final_velocity,time); t=deceleration_time(initial_velocity,a); printf("The deceleration is %.2f unit.",a); printf("The deceleration time is %.2f unit.",t); system("pause"); return 0; } double deceleration(double initial_velocity,double final_velocity,double time) {double a; a=(final_velocity-initial_velocity)/time; return(a); } double deceleration_time(double initial_velocity,double a) {double t; t=fabs(initial_velocity/a); return(t); } 9.计算每个容器的开销和所有容器总共的开销。要求：用户显示指令函数和计算表面积的函 数。 #include<stdio.h> #include<stdlib.h> #include<math.h> #define PI 3.14159 double each_area(double radius,double height); double each_cost(double unit_price,double radius,double height); double gross_cost(double quantity,double unit_price,double radius,double height); int main(void) {double each_area(double,double); double each_cost(double,double,double); double gross_cost(double,double,double,double); double radius,height,unit_price; double quantity; printf("Please enter the radius of the subface >>"); scanf("%lf",&radius); printf("Please enter the height of the container>>"); scanf("%lf",&height); printf("Please enter the price of the material>>"); scanf("%lf",&unit_price); printf("Please enter the quantity of the container >>"); scanf("%lf",&quantity); printf("The surface of each container is %.2f .\n",each_area(radius,height)); printf("The container each cost %.2f dollars.\n",each_cost(unit_price,radius,height)); printf("The gross cost %.2f dollars.\n",gross_cost(quantity,unit_price,radius,height));
double meter_velocity(double,double); double time,kilometers,minutes,seconds; printf("please enter the length of race>>"); scanf("%lf",&kilometers); printf("please enter the time of race>>"); scanf("%lf%lf",&minutes,&seconds); time=minutes*60+seconds; printf("the velocity of candidate is %.2f mps.\n",meter_velocity(kilometers,time)); /*一个函数只能返回一个数值。*/ printf("the velocity of candidate is %.2f fps.\n",mile_velocity(kilometers,time)); system("pause"); return 0; } double mile_velocity(double kilometers,double time) {double velocity,miles; miles=kilometers*3282/5280; velocity=miles/time; return(velocity); } double meter_velocity(double kilometers,double time)
double scale(double x,int n);
int main(void)
{double scale(double,int);
double num_1; int n=2; printf("Please enter x>>"); scanf("%lf",&num_1); printf("The rounded x is %.2f.",scale(num_1,n)); system("pause"); return 0; } double scale(double num_1,int n) {double y,rounded_x;
int main(void)
{double time(double,double,double);
/*必须要有*/
double height(double,double,double);
/*必须要有*//
double theta,distance,velocity,a,b;
printf("The theta of elevation is>>");
printf("Please enter the terms duration of loan>>");
scanf("%lf",&terms);
printf("Please enter the initial_payment>>");
scanf("%lf",&initial_payment);
temp=1+monthly_interest_rate;
a=time(theta,distance,velocity);
/*赋值将函数转化为变量*/
b=height(a,theta,velocity);
/*赋值将函数转化为变量*/
printf("The time is %f seconds and the height is %f ft.",a,b);
system("pause");
c 语言详解（第五版）第三章程序设计项目答案
1.假设买一辆车首付为 500dollar。请计算月供。
#include<stdio.h>
#include<math.h>
#include<stdlib.h>
int main(void)
{double capital_sum,monthly_interest_rate,initial_payment,temp,payment,terms;
return 0;
}
double time(double theta,double distance,double velocity)
/*数据类型一定要写好*/
{double time;
time=distance/(velocity*cos(theta));
return(time);
}
double height(double a,double theta,double velocity)
{double velocity; velocity=kilometers/time; return(velocity); } 7.买房子，5年的开销。 #include<stdio.h> #include<math.h> #include<stdlib.h> double feul_cost(double x); double property_tax(double initial_payment,double tax_rate); int main(void) {double x,tax_rate,initial_payment; printf("Please enter the feul cost per year>>"); scanf("%lf",&x); printf("Please enter the property rate per year>>"); scanf("%lf",&tax_rate); printf("Please enter the initial payment>>"); scanf("%lf",&initial_payment); printf("The feul cost of five years is %.2f dollars\n",feul_cost(x)); printf("The property tax of five years is %.2f dollars\n",property_tax(initial_payment,tax_rate)); system("pause"); return 0; } double feul_cost(double x) {return(x*5); } double property_tax(double initial_payment,double tax_rate) {