c primer plus 5编程练习

1、

#include <stdio.h>

#define M_PER_HOUR 60

int main(void)
{
    int min;
    
    int hour, min_left;
    
    printf("please input the minutes to convert: ");
    scanf("%d", &min);
    
    while(min > 0)
    {
        hour = min / M_PER_HOUR;
        min_left = min % M_PER_HOUR;
        
        printf("%d minutes is %d hour and %d min.
", min, hour, min_left);
        
        printf("please input minutes to convert again: ");
        scanf("%d", &min);
    }
    
    return 0;
}

2、

#include <stdio.h>

int main(void)
{
    int num;
    int end;

    printf("please input an integer: ");
    scanf("%d", &num);
    end = num + 10;
    
    while(num <= end)
    {
        printf("%d	", num);
        num++;    
    }
    
    return 0;
}

3、……

#include <stdio.h>

#define DAYS_PER_WEEK 7

int main(void)
{
    int days;
    int week, days_left;
    
    printf("please input days: ");
    scanf("%d", &days);
    
    while(days > 0)
    {
        week = days / DAYS_PER_WEEK;
        days_left = days % DAYS_PER_WEEK;
        
        printf("%d days is %d week and %d days.
", days, week, days_left);
        
        printf("please input days again: ");
        scanf("%d", &days);
    }
    
    return 0;
}

4、

#include <stdio.h>

#define CM_PER_FEET 36.4  //???
#define CM_PER_INCHES 15.5  // ???

int main(void)
{
    float height;
    float feet, inches;
    
    
    printf("please input height: ");
    scanf("%f", &height);
    
    while(height > 0)
    {
        feet = height / CM_PER_FEET;
        inches = height / CM_PER_INCHES;
        
        printf("height in cm: %.1f.
", height);
        printf("height in feet: %.1f
", feet);
        printf("height in inches: %.1f
", inches);
        
        printf("please input height again: ");
        scanf("%f", &height);
    }
    
    return 0;
}

 

5、

#include <stdio.h>

int main(void)
{
    int count, sum;
    int days;
    
    count = 0;
    sum = 0;
    
    printf("please input the days: ");
    scanf("%d", &days);
    
    while(count++ < days)
        sum = sum + count;
    printf("sum = %d
", sum);
    
    return 0;
}

6、

#include <stdio.h>

int main(void)
{
    int count, sum;
    int days;
    int tmp;
    
    count = 0;
    sum = 0;
    
    printf("please input the days: ");
    scanf("%d", &days);
    
    while(count++ < days)
    {
        tmp = count * count; 
        sum = sum + tmp;
    }
    printf("sum = %d
", sum);
    
    return 0;
}

7、

#include <stdio.h>

void cubic(double n);

int main(void)
{
    double num;
    
    printf("please input an num: ");
    scanf("%lf", &num);
    
    cubic(num);
    
    return 0; 
}

void cubic(double n)
{
    printf("cubic of %.2f: %.2f.
", n,  n * n * n);
}

8、

#include <stdio.h>

int main(void)
{
    int num1, num2;
    int remainder;
    
    printf("please input num1: ");
    scanf("%d", &num1);
    
    printf("please input num2: ");
    scanf("%d", &num2);
    
    while(num2 > 0)
    {
        remainder = num2 % num1;
        
        printf("%d %% %d is %d.
", num2, num1, remainder);
        
        printf("please input num2 again: ");
        scanf("%d", &num2);
    }
    
    return 0;
}

9、

#include <stdio.h>

void Temperatures(double n);

int main(void)
{
    double tempera;
    int test;
    
    printf("please input the temperature: ");
    test = scanf("%lf", &tempera);
    
    while(test == 1)
    {
        Temperatures(tempera);
        
        printf("please input the temperature again: ");
        test = scanf("%lf", &tempera); 
    }
    
    return 0;
}

void Temperatures(const double n)
{
    double shishetem, kaishitem;
    
    shishetem = 5.0 / 9.0 * (n - 32.0);
    kaishitem = n + 273.16;
    
    printf("huashitem: %.2f.
", n);
    printf("shishitem: %.2f.
", shishetem);
    printf("kaishitem: %.2f.
", kaishitem);
    
}