C语言 百炼成钢2

//题目4:输入某年某月某日,判断这一天是这一年的第几天?

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>

//分析:某年决定是平年还是闰年,某月决定本月有多少天,最后结果是前几个月的时间+本月已过的天数
//闰年的判断 (year%4==0&&year%100!=0)||(year%400==0)

int protect(int year, int month){
    //year==1表示闰年,year=0表示平年
    int res = 0;
    int tuemonth = 28;
    if (year)
    {
        tuemonth = 29;
    }
    switch (month - 1)
    {
    case 0:
        res = 0;
        break;
    case 1:
        res = 31;
        break;
    case 2:
        res = 31 + tuemonth;
        break;
    case 3:
        res = 31 + tuemonth + 31;
        break;
    case 4:
        res = 31 + tuemonth + 31 + 30;
        break;
    case 5:
        res = 31 + tuemonth + 31 + 30 + 31;
        break;
    case 6:
        res = 31 + tuemonth + 31 + 30 + 31 + 30;
        break;
    case 7:
        res = 31 + tuemonth + 31 + 30 + 31 + 30 + 31;
        break;
    case 8:
        res = 31 + tuemonth + 31 + 30 + 31 + 30 + 31 + 31;
        break;
    case 9:
        res = 31 + tuemonth + 31 + 30 + 31 + 30 + 31 + 31 + 30;
        break;
    case 10:
        res = 31 + tuemonth + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31;
        break;
    case 11:
        res = 31 + tuemonth + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30;
        break;
    default:
        res = 31 + tuemonth + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31;
        break;
    }
    return res;
}

void main(){
    int year = 0;
    int month = 0;
    int day = 0;
    int res = 0;
    printf("请输入年月日!\n");
    scanf("%d,%d,%d", &year,&month,&day);
    //
    //判断年
    if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
    {
        //判断该年是闰年,二月份有29天
        res = protect(1, month) + day;
    }
    else
    {
        res = protect(0, month) + day;
    }
    printf("这一天是这一年的第%d天", res);

    system("pause");
}

 

 

 

 

//题目5:输入三个整数x,y,z,请把这三个数由小到大输出。

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>

void sortnum(int *x,int *y,int *z){
    int temp = 0;
    if (*x>*y)
    {
        temp = *x;
        *x = *y;
        *y = temp;
    }
    if (*y>*z)
    {
        temp = *z;
        *z = *y;
        *y = temp;
    }
    //至此*z的数值最大
    if (*x>*y)
    {
        temp = *x;
        *x = *y;
        *y = temp;
    }
    //至此*x的数值最小
}

void main(){
    int x, y, z;
    int *px, *py, *pz;
    px = &x;
    py = &y;
    pz = &z;
    scanf("%d%d%d", px, py, pz);
    printf("\n你输入的数据是X=%d;Y=%d;Z=%d", *px, *py, *pz);
    sortnum(px, py, pz);
    printf("\n你排序之后的数据是X=%d;Y=%d;Z=%d", *px, *py, *pz);


    system("pause");
}

 

 

//题目6:用*号输出圆形图案。



#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<math.h>


//分析;(x1-x2)^2+(y1-y2)^2=R^2;其中r是园的半径,(x1-x2)^2+(y1-y2)^2是获取一个点与园心坐标的距离
//本题假设r=10,圆心坐标就是(10,0)
//pow() 函数用来求 x 的 y 次幂(次方),其原型为:double pow(double x, double y);

//本圆不圆,是因为屏幕的行间距和列间距不相等

void main(){
    //上方y轴
    for (int i = 10; i >-11; i--)
    {
        //左侧x轴
        for (int j = 0; j < 11; j++)
        {
            if ((pow((j - 10),2.0)+pow(i,2.0))==pow(10.0,2.0))
            {
                printf("*");
            }
            else{
                printf(" ");
            }
        }
        //右侧x轴
        for (int j = 11; j < 21; j++)
        {
            if ((pow((j - 10), 2.0) + pow(i, 2.0)) == pow(10.0, 2.0))
            {
                printf("*");
            }
            else{
                printf(" ");
            }
        }
        printf("\n");
    }
    system("pause");
}

 

posted on 2016-01-21 00:00  寒魔影  阅读(238)  评论(0编辑  收藏  举报

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