C Primer Plus--第5章 运算符、表达式和语句
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5.11编程练习
/*习题1：把分钟转换为小时和分钟*/
#include<stdio.h>
#define HOUR 60
int main(void)
{
int minute,time_h,time_m;
printf("Please enter minutes:\n");
scanf("%d",&minute); // 读入分钟
while(minute>0)
{
time_h = minute / HOUR; //得到的小时数
time_m = minute % HOUR;//剩下的分钟数
printf("%d hour is %d minutes.\n",time_h,time_m);
printf("Enter next values.(<=0 quit):\n");
scanf("%d",&minute);
}
printf("Done!\n");
return 0;
}
AI写代码 Please enter minutes:
Enter next values.(<=0 quit):
366
6 hour is 6 minutes.
Enter next values.(<=0 quit):
0
Done!
--------------------------------
Process exited after 6.489 seconds with return value 0
请按任意键继续. . .
AI写代码 /*习题2：编写一个程序，此程序要求输入一个整数，然后打印出从（包括）输入的值到（包括）比输入的值大10的所有整数值*/
#include<stdio.h>
int main(void)
{
int num,i;
printf("Please enter a number:\n");
scanf("%d",&num);
while(i++<11)
printf("%5d",num++);
printf("\n");
return 0;
}
AI写代码 Please enter a number:
5
5 6 7 8 9 10 11 12 13 14 15
--------------------------------
Process exited after 4.136 seconds with return value 0
请按任意键继续. . .
AI写代码 /*习题3：要求输入天数，然后将该值转换为周数和天数*/
#include<stdio.h>
#define DAY_PER_WEEK 7;
int main(void)
{
int day,week,num_d;
printf("Conver days to weeks and days!\n");
printf("Please enter days(<=0 quit):\n");
scanf("%d",&day);
while(day>0)
{
week = day / DAY_PER_WEEK;
num_d = day % DAY_PER_WEEK;
printf("%d days are %d weeks, %d days.\n",day,week,num_d);
printf("Enter the next value.(<=0 quit):\n");
scanf("%d",&day);
}
printf("Done!\n");
return 0;
}
AI写代码 Conver days to weeks and days!
Please enter days(<=0 quit):
12
12 days are 1 weeks, 5 days.
Enter the next value.(<=0 quit):
11
11 days are 1 weeks, 4 days.
Enter the next value.(<=0 quit):
14
14 days are 2 weeks, 0 days.
Enter the next value.(<=0 quit):
0
Done!
--------------------------------
Process exited after 17.81 seconds with return value 0
请按任意键继续. . .
AI写代码 /*习题4：编写一个程序让用户按厘米输入一个高度值，然后，程序按照厘米和英尺英寸显示这个高度值*/
#include<stdio.h>
#define INCHES_FEET 12
#define CM_INCHES 2.54
int main(void)
{
float centimeters,inches,left;
int feet;
printf("Conver cm to feet and inches!\n");
printf("Please enter a height in centimeters:\n");
scanf("%f",¢imeters);
while(centimeters>0)
{
inches = centimeters / CM_INCHES;
feet = (int)inches / INCHES_FEET;
left = inches - feet * INCHES_FEET;
printf("%.1f cm are %d feet, %.1f inches.\n",centimeters,feet,left);
printf("Enter the next centimeters.(=<0 quit):\n");
scanf("%f",¢imeters);
}
printf("bye!\n");
return 0;
}
AI写代码 Conver cm to feet and inches!
Please enter a height in centimeters:
182
182.0 cm are 5 feet, 11.7 inches.
Enter the next centimeters.(=<0 quit):
168
168.0 cm are 5 feet, 6.1 inches.
Enter the next centimeters.(=<0 quit):
0
bye!
--------------------------------
Process exited after 13.92 seconds with return value 0
请按任意键继续. . .
AI写代码 /*第5题、第6题*/
#include<stdio.h>
int main(void)
{
int count,sum;
int n;
count = 0;
sum = 0;
printf("Enter the limit numb:\n");
scanf("%d",&n);
while(count++ <n)
sum = sum + count;//第6题这里在*count便可;
printf("sum = %d\n",sum);
return 0;
}
AI写代码 Enter the limit numb:
100
sum = 5050
--------------------------------
Process exited after 1.373 seconds with return value 0
请按任意键继续. . .
AI写代码 /*习题7：编写一个程序，该程序要求输入一个float型数并打印改数的立方值。使用您自己设计的函数来计算改值并打印出来，main()程序把输入的值传递给该函数。*/
#include<stdio.h>
void my_print(float n);
int main(void)
{
float val;
printf("Please enter a float number.\n");
scanf("%f",&val);
my_print(val);
printf("Very Good!\n");
return 0;
}
void my_print(float n)
{
printf("The cobe of number %.2f is %.2f.\n",n,n*n*n);
}
AI写代码 Please enter a float number.
2
The cobe of number 2.00 is 8.00.
Very Good!
--------------------------------
Process exited after 0.6425 seconds with return value 0
请按任意键继续. . .
AI写代码 /*习题8：编写一个程序，该程序要求用户输入一个华氏温度。程序以double类型读入温度值，并将它作为一个参数传递给用户提供的函数Temperatures()。该函数将计算相应的摄氏温度和绝对温度，并以小数点右边有两位数字的精度显示这三种温度。它应该用每个值所代表的温度刻度来标识这3个值。下面是将华氏温度转换成摄氏温度的方程：
Celsius = 1.8 * Fahreneit + 32.0
通常科学上的绝对温度的刻度是0代表绝对零，是可能温度的下界。下面是将摄氏温度转换为绝对温度的方程：
Kelvin=Celsius+273.16
Temperatures()函数使用const来创建代表该转换里的3个常量的符号。main()函数将使用一个循环来允许用户重复地输入温度，当用户输入q或其他非数字值时，循环结束。*/
#include <stdio.h>
void Temperatures(double n);
int main(void)
{
float Fahrenheit;
printf("Please enter Fahrenheit:\n");
while (scanf("%f",&Fahrenheit))
{
Temperatures(Fahrenheit);
printf("Input the next value:\n");
}
return 0;
printf("Bye!\n");
}
void Temperatures(double n)
{
const double A = 1.8;
const double B = 32.0;
const double C = 273.16;
double celsius,kelvin;
celsius = A * n + B;
kelvin = celsius + C;
printf("Display %.2f Fahrenheit = %.2f celsius = %.2f kelvin.\n",n,celsius,kelvin);
}
/*按照书中给定公式计算，但是书中公式貌似存在错误。*/
AI写代码 Please enter Fahrenheit:
100
Display 100.00 Fahrenheit = 212.00 celsius = 485.16 kelvin.
Input the next value:
200
Display 200.00 Fahrenheit = 392.00 celsius = 665.16 kelvin.
Input the next value:
y
Bye!
--------------------------------
Process exited after 5.919 seconds with return value 0
请按任意键继续. . .
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