【C Primer Plus】编程练习第五章

1、

#include <stdio.h>
#include <string>
#define H_PER_M 60
int main()
{
    int min, hour;
    printf("请输入分钟数：");
    scanf("%d", &min);
    getchar();
    while (min > 0) {
        hour = min / H_PER_M;
        min = min % H_PER_M;
        printf("总共%d小时，%d分钟
", hour, min);
        printf("请继续输入
");
        scanf("%d", &min);
        getchar();
    }
    printf("结束");
    return 0;
}

 2、

#include <stdio.h>
#include <string>
#define H_PER_M 60
int main()
{
    int a,i;
    printf("请输入一个整数：");
    scanf("%d", &i);
    getchar();
    a = i + 10;
    printf("%d", i); //这是为了让*号只存在于两个数之间
    while (i<a) {
        printf("*");
        i++;
        printf("%d", i);
        
    }
    getchar();
    return 0;
}

3、

#include <stdio.h>
#include <string>
int main()
{
    int weeks,days,day;
    printf("请输入工作天数：");
    scanf("%d", &days);
    getchar();
    weeks = days/7;
    day = days % 7;
    printf("%d days are %d weeks, %d days",days,weeks,day);
    getchar();
    return 0;
}

 4、

#include <stdio.h>
#include <string>
#define FEET (12*2.54)
#define INCH 2.54
int main()
{
    float cm = 0;
    int feet = 0;
    float inch = 0;
    printf("Enter a height in centimeters：");
    scanf("%f", &cm);
    getchar();
    while (cm > 0)
    {
        feet = cm / FEET;
        inch = (cm - feet*FEET) / INCH;
        printf("%0.1f cm = %d feet, %0.1f inches
", cm, feet, inch);
        printf("Enter a height in centimeters (<=0 to quit) ：");
        scanf("%f", &cm);
        getchar();
    }
    printf("bye");
    getchar();
    return 0;
}

 

  

 5、

#include <stdio.h>
#include <string>

int main()
{
    int count, sum, day;
    count = 0;
    sum = 0;
    printf("请输入工作天数：");
    scanf("%d",&day);
    getchar();
    while (day > 0) {
        while (count++ < day)
            sum = sum + count;
        printf("sum = %d
", sum);
        sum = 0;
        count = 0;
        printf("请输入工作天数：");
        scanf("%d", &day);
        getchar();
    }
    
    getchar();
    return 0;
}

 6、

#include <stdio.h>
#include <string>

int main()
{
    int count, sum, day,count_2;
    count = 0;
    sum = 0;
    printf("请输入工作天数：");
    scanf("%d",&day);
    getchar();
    while (day > 0) {
        while (count++ < day)
        {
            count_2 = count*count;  //用一个数保存count的平方
            sum = sum + count_2;
        }
        printf("sum = %d
", sum);
        sum = 0;
        count = 0;
        printf("请输入工作天数：");
        scanf("%d", &day);
        getchar();
    }
    
    getchar();
    return 0;
}

7、

#include <stdio.h>
#include <string>
double da_3(double data);
int main()
{
    double data,a;
    while (1)
    {
        printf("请输入数组：");
        scanf("%lf", &data);
        getchar();
        a = da_3(data);
        printf("结果为%lf
", a);
    }
    getchar();
    return 0;
}

double da_3(double data) {
    double a = 0;
    a = data*data*data;
    return a;
}

 8、

#include <stdio.h>
#include <string>

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

 9、

#include <stdio.h>
#include <string>
double wendu, st, kt,judge,hs;
void Temperatures(double heat);

int main()
{
    printf("请输入华氏温度：");
    while (scanf("%lf", &wendu)) //输入时float 用 %f, double 用 %lf, 这是约定(规定),在这里浪费了好多时间，请注意
    {
        getchar();
        Temperatures(wendu);        
        printf("请输入华氏温度：");
    }
    getchar();
    return 0;
}

void Temperatures(double heat) {
    const double htos = 32;
    const double stok = 273.16;
    hs = heat;
    st = 5.0 / 9.0*(hs - htos);
    kt = st + stok;
    printf("华氏温度为：%.2f
", hs);
    printf("摄氏温度为：%.2f
", st);
    printf("开氏温度为：%.2f
", kt);
}