2
#include <stdio.h>
#define VALUE(X,Y) (1/((1/(X)+1/(Y))/2))
int main()
{
double x,y;
puts("请输入 2 个数: ");
while (scanf_s("%lf%lf", &x, &y) == 2 && (x != 0 || y != 0))
{
printf("%g 和 %g 的调和平均数为 %g\n", x, y, VALUE(x, y));
puts("请输入下一组数[0 0退出]:");
}
system("pause");
return 0;
}
3
读书少，完全不懂这道数学题目，看的别人的计算方式
#include <stdio.h>
#include <math.h>
#define PI 3.141592654
struct value1
{
double x;
double y;
};
struct value2
{
double r;
double a;
};
void compute(struct value2 *ps1, struct value1 *ps2);
int main()
{
struct value2 value;
struct value1 values;
puts("请输入向量的模和角度:");
while (scanf_s("%lf%lf", &value.r, &value.a) == 2 && (value.r != 0 || value.a != 0))
{
compute(&value, &values);
printf("x 和 y 的坐标为: %g %g\n", values.x, values.y);
puts("请输入向量的模和角度[0 0退出]:");
}
puts("完成");
system("pause");
return 0;
}
void compute(struct value2 *ps1, struct value1 *ps2)
{
static double z = PI / 180.0;
double ang = z * ps1->a;
ps2->x = ps1->r*cos(ang);
ps2->y = ps1->r*sin(ang);
}
4
#include <stdio.h>
#include <time.h>
void count(double n);
int main()
{
double time;
puts("请输入时间[s]:");
while (scanf_s("%lf", &time) == 1)
{
count(time);
puts("时间完成退出.");
puts("请输入时间[s][q退出]:");
}
puts("完成");
system("pause");
return 0;
}
void count(double n)
{
double time;
time = (double)clock() / (double)CLOCKS_PER_SEC;
while ((double)clock() / (double)CLOCKS_PER_SEC < time + n);
}
5
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define SIZE 33
//抽签
void roll(int *st, int n, int m);
int main()
{
int n[SIZE] = { 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33 };
int num;
srand((unsigned int)time(0)); //获取系统时间 生成随机种子
puts("请输入抽签的次数:");
while (scanf_s("%d", &num) == 1)
{
if (num <= 0 || num > SIZE)
{
puts("错误: 请输入1-33之间.");
continue;
}
roll(n, SIZE, num);
puts("请输入抽签的次数[q退出]:");
}
puts("完成退出");
system("pause");
return 0;
}
void roll(int *st, int n, int m)
{
int i, j;
int s_temp;
int temp[SIZE];
int count;
for (i = 0; i < m; i++)
{
s_temp = st[rand() % n];
for (j = 0, count = 0; j < i; j++)
{
if (temp[j] == s_temp)
count++;
}
if (count == 0)
{
temp[i] = s_temp;
printf("%d ", temp[i]);
}
else
i--;
}
putchar('\n');
}
顺便做了一个双色球随机选号系统
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define RSIZE 33
#define BSIZE 16
//抽签
void roll(int *st, int n, int m);
//清除输入行
inline static void d_stdin();
//延迟开关
char ch = 'n';
int main()
{
int red[RSIZE] = { 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33 };
int blue[BSIZE] = { 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 };
int num;
srand((unsigned int)time(0)); //获取系统时间 生成随机种子
puts("*******双色球开奖系统*******");
puts("请输入随机选号的次数:");
while (scanf_s("%d", &num) == 1)
{
d_stdin();
puts("询问: 是否打开延迟功能[Y/N]");
scanf_s("%c", &ch, 1);
if (ch == 'Y' || ch == 'y')
puts("已经打开模拟抽奖时间功能.");
else if (ch == 'N' || ch == 'n')
puts("已经关闭模拟抽奖时间功能.");
else
puts("输入错误: 默认关闭模拟抽奖时间功能.");
putchar('\n');
for (int i = 0; i < num; i++)
{
printf("第 %d 次选号结果为:\n", i + 1);
printf("红球:");
roll(red, RSIZE, 6);
printf("蓝球:");
roll(blue, BSIZE, 1);
putchar('\n');
}
puts("*******双色球开奖系统*******");
puts("请输入随机选号的次数[q退出]:");
}
puts("********选号完成退出********");
system("pause");
return 0;
}
inline static void d_stdin()
{
while (getchar() != '\n')
continue;
}
void roll(int *st, int n, int m)
{
int i, j;
int s_temp;
int temp[RSIZE];
int count;
double time;
for (i = 0; i < m; i++)
{
s_temp = st[rand() % n];
for (j = 0, count = 0; j < i; j++)
{
if (temp[j] == s_temp)
count++;
}
if (count == 0)
temp[i] = s_temp;
else
i--;
}
for (i = 0; i < m; i++)
{
for (j = i; j < m; j++)
{
if (temp[i] > temp[j])
{
s_temp = temp[i];
temp[i] = temp[j];
temp[j] = s_temp;
}
}
}
for (i = 0; i < m; i++)
{
//获取时间值
time = (double)clock() / (double)CLOCKS_PER_SEC;
if (ch == 'Y' || ch == 'y')
while ((double)clock() / (double)CLOCKS_PER_SEC < time + 0.8); //获取时间值 大于 原先获取时间值加0.8 时跳出循环
printf("%02d ", temp[i]);
}
putchar('\n');
}
6
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define NUM 40
struct names
{
char first[NUM];
char last[NUM];
};
void showarray(const struct names *pst, int n);
int mycomp(const void *p1, const void *p2);
int main()
{
struct names list[4] =
{
{ "xiaojun","lei" },
{"kang","lei"},
{ "dan","zhu" },
{"xiangwei","liu"}
};
puts("随机列表:");
showarray(list, 4);
qsort(list, 4, sizeof(struct names), mycomp);
puts("\n排序列表:");
showarray(list, 4);
system("pause");
return 0;
}
void showarray(const struct names *pst, int n)
{
int index;
for (index = 0; index < n; index++)
{
printf("%s, %s ", pst[index].first, pst[index].last);
putchar('\n');
}
}
int mycomp(const void *p1, const void *p2)
{
const struct names *a1 = (const struct names *)p1;
const struct names *a2 = (const struct names *)p2;
int res;
res = strcmp(a1->last, a2->last);
if (res != 0)
return res;
else
return strcmp(a1->first, a2->first);
}
7
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
//打印
void show_array(const double ar[], int n);
//变参函数
double *new_d_array(int n, ...);
int main()
{
double *p1;
double *p2;
p1 = new_d_array(5, 1.2, 2.3, 3.4, 4.5, 5.6);
p2 = new_d_array(4, 100.0, 20.00, 8.08, -1890.0);
show_array(p1, 5);
show_array(p2, 4);
free(p1);
free(p2);
system("pause");
return 0;
}
double *new_d_array(int n, ...)
{
va_list ap; //声明一个对象储存参数
double *pf;
int i;
pf = (double *)malloc(n * sizeof(double));
va_start(ap, n); //把ap初始化为参数列表
for (i = 0; i < n; i++)
pf[i] = va_arg(ap, double);
va_end(ap);
return pf;
}
void show_array(const double ar[], int n)
{
int i;
for (i = 0; i < n; i++)
printf("%-8.2f ", ar[i]);
putchar('\n');
}
