C Primer Plus（第六版）第五章 编程练习答案

Posted 2021-08-16 水番正文

 前言：由于不是太复杂，第五章的程序我就全部集成在一个程序了，仅供参考，新手勿喷。

(梅开三度

CH05 Code answer:

#include<stdio.h>

#define SIXTY 60 
const float YINCUN = 0.5;
const float YINCHI = 0.3;

void double_printf(double x);

void Temperatures(double t);

int main(void)
{
	printf("5.11.1\\n");
	float min1=1;
	while(min1 > 0)
	{
		printf("请输入分钟单位的时间:");
		scanf("%f",&min1);	
		printf("现在为 %2.0f分钟 %f小时\\n",min1,min1/SIXTY); 
	}
	printf("\\n");
	
	printf("5.11.2\\n");
	int num1,test;
	printf("请输入一个整数:");
	scanf("%d",&num1);
	test = num1;
	while(num1++ <= test+10)
	{
		printf("num1:%d \\t\\n",num1-1);
	}
	printf("\\n");
	
	printf("5.11.3\\n");
	int day=1;
	int week,days;
	printf("请输入天数");
	while(day > 0)
	{
		scanf("%d",&day);
		week = day / 7;
		days = day % 7;	
		printf("%d day are %d weeks,%d days\\n",day,week,days);
	 } 
	printf("\\n");
	
	printf("5.11.4\\n");
	float height;
	printf("Enter a height in centimeters:");
	while(1 == scanf("%f",&height),height > 0)			//加个条件要>0,就可以实现非正数退出 
	{
		printf("%f cm = %f feet, %f inches\\n",height,height*YINCHI,height*YINCUN);
		printf("Enter a height in centimeters (<=0 to quit)");		
	} 
		printf("bye\\n");
	printf("\\n");
	
	printf("5.11.5\\n");
	int count1=0,sum1=0,num2;
	printf("输入一个数,计算到此数的和:");
	scanf("%d",&num2);
	while(count1++<num2)
	{
		sum1 += count1;
	}
	printf("和为:%d\\n",sum1); 	
	printf("\\n");
	
	printf("5.11.6\\n");
	int count2=0,sum2=0,num3;
	printf("输入一个数,计算到此数的平方和:");
	scanf("%d",&num3);
	while(count2++<num3)
	{
		sum2 += count2*count2;
	}
	printf("平方和为:%d\\n",sum2);
	printf("\\n");
	
	printf("5.11.7\\n");
	double d_n;
	printf("请输入一个double类型的数:");	//输入的是 lf !!!! 
	scanf("%lf",&d_n);
	double_printf(d_n);						//这边只用传参不用声明 
	printf("\\n");
	
	printf("5.11.8\\n");
	int op1,op2;
	printf("This program computes moduli.\\n");
	printf("Enter an integer to serve as the second operand:");
	scanf("%d",&op2);
	printf("Now enter the first operand:");
	while(1 == scanf("%d",&op1) , op1 > 0)
	{
		printf("%d %% %d is %d\\n",op1,op2,op1%op2); 
		printf("Enter next number for first operand (<= 0 to quit):");
	}
	printf("Done\\n");
	printf("\\n");
	
	printf("5.11.9\\n");
	double h;
	printf("请输入一个华氏温度:");
	while(1 == scanf("%lf",&h))
	{
		Temperatures(h);
		printf("请继续输入一个华氏温度(如果想退出输入任意非数字):");
	 } 
	 printf("结束");
	printf("\\n");	
} 

void double_printf(double x)			//返回值类型 函数名 函数定义 
{
	printf("立方为:%f\\n",x*x*x);
}

void Temperatures(double t)
{
	const float HUASHI = -32*5/9;
	const float KAISHI = 273.16;
	
	printf("华氏:%lf\\n摄氏:%lf\\n开氏:%lf\\n",t,t*5/9+HUASHI,t+KAISHI);
}