《C Primer Plus》中文第六版 编程练习答案 第五章 运算符、表达式和语句

    #include <stdio.h>
    #define time 60 
    int main()
    {
    	int min,hour,minute;
    	printf("请您输入分钟：");
    	scanf("%d",&min);
    	while(min>0)
    	{
    		hour=min/time;
    		minute=min%time;
    		printf("%d分等于%d时%d分\n",min,hour,minute); 
    		printf("请您再次输入分钟：");
    		scanf("%d",&min);
    	}
    	printf("done");
    	
    	return 0;
    }

    #include <stdio.h>
    int main()
    {
    	int n;
    	int cnt=0;
    	printf("请输入一个整数：");
    	scanf("%d",&n);
    	while(cnt<=10) 　 
    	{
    		cnt++;
    		printf("%d ",n);
    		n++;
    	}
    	return 0;
     }

    #include <stdio.h>
    int main()
    {
    	int n,weeks,days;
    	printf("请输入一个天数：");
    	scanf("%d",&n);
    	while(n>0)  
    	{
    		weeks=n/7;
    		days=n%7;
    		printf("%d天等于%d周，%d天\n",n,weeks,days);
    		printf("请再输入一个天数：");
    	    scanf("%d",&n);
    	}
    	printf("done"); 
    	return 0;
     }

    #include <stdio.h>
    #define FT 30.48 //1英尺等于30.48cm,
    #define IN 2.51 // 1英寸等于2.51cm  1英尺等于12英寸 
    int main()
    {
    	double height,inch;//厘米,英寸 
    	int foot;//，英尺
    	printf("Enter a height in centimeters:");
    	scanf("%lf",&height);
    	while(height>0)
    	{
    		foot=height/FT;
    		inch=(height-foot*FT)/IN;
    		printf("%0.1lf cm = %d feet,%0.1f inches\n",height,foot,inch);//double 匹配的是lf!!! 
    		printf("Enter a height in centimeters:");
    	    scanf("%lf",&height);	
    	}
    	printf("done"); 
    	return 0;
     }

    #include <stdio.h>
    int main()
    {
    	int days;
    	int sum=0;
    	int cnt=0;
    	printf("第几天：");
    	scanf("%d",&days);
    	while(cnt<=days)
    	{
    		sum+=cnt;
    		cnt++;
    	}
    printf("%d天赚了$%d",days,sum);
    	return 0;
     }

    #include <stdio.h>
    int main()
    {
    	int days,square;
    	int sum=0;
    	int cnt=0;
    	printf("第几天?");
    	scanf("%d",&days);
    	while(cnt++<days)
    	{
    		square=cnt*cnt;
    		sum+=square;
    	}
    printf("%d天赚了$%d\n",days,sum);
    	return 0;
     }

    #include <stdio.h>
    double cube(double n);
    int main()
    {
    	double m;
    	printf("请输入一个数：");
    	scanf("%lf",&m);
    	cube(m) ;
    	return 0;
     } 
     void cube(double n)
     {
     	printf("%g 的立方是%g",n,n*n*n);//使用%g根据输入的double数精度自动转换%e or %f
     	return;
     }

    #include <stdio.h>
    int main()
    {
    	int a,b;
    	printf("This program computes moduli.\n");
    	printf("Enter an integer to sarve as the first second operand:");
    	scanf("%d",&a);
    	printf("Now enter the first operand:");
    	scanf("%d",&b);
    	while(b>0)
    	{
    	    printf("%d %% %d is %d\n",b,a,b%a);
    	    printf("Enter next number for first operand (<=0 to quit):");
    	    scanf("%d",&b);	
    	}
    	printf("Done");
    
    	return 0;
     }

    #include <stdio.h>
    void Temperatures(double ht);
    int main()
    {
    	double HT;
    	printf("输入华氏温度：");
    	while(scanf("%lf",&HT)==1)//下面这句等同于true=scanf("%lf",&HT);while(true==1)
    	{
    		Temperatures(HT);
    		printf("再次输入华氏温度：");/*不能再写一遍scanf,再写一遍即需输入两次。若为注释这种，需再写一遍true判断	*/
    	}
    	printf("done");
    	return 0;
     } 
    void Temperatures(double ht)
    {
    	const double a=5.0/9.0;
    	const double b=32.0;
    	const double c=273.16;
    	double st,kt;//摄氏温度，开式温度； 
    	st=a*(ht-b);
    	kt=st+c; 
    	printf("华氏温度为%0.2f时，摄氏温度为%0.2f,开式温度为%0.2f\n",ht,st,kt);
    	return; 
    }