$
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##
$$$
###
$$$
##
$

int main()
{
    char array[] = {'#', '$'};
    for (int row = 1; row <= 7; row++) {
        for (int hashNum = 1; hashNum <= 4 - abs(4 - row); hashNum++)
        {
            printf("%c", array[row % 2]);
        }
        printf("\n");
    }
}

#include "stdafx.h"
#include <stdio.h>
#define N 5
//Score Input Sort Show
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void input(double[]);
void sortAsc(double[]);
void sortDesc(double[]);
void show(double[]);

int main()
{
    double scores[N];
    input(scores);

    printf("[SORT ASC]\n");
    sortAsc(scores);
    show(scores);

    printf("[SORT DESC]\n");
    sortDesc(scores);
    show(scores);

    return 0;
}

void input(double socres[])
{
    int i;
    for (i = 0; i < N; i++) {
        printf("Please enter %d student's score: ", i+1);
        scanf_s("%lf", &socres[i]);
    }
}

void sortAsc(double socres[])
{
    int i, j;
    double temp;
    for (i = 0; i < N - 1; i++)
    {
        {
            for (j = 0; j < N - i - 1; j++)
            {
                if (socres[j] > socres[j + 1])
                {
                    temp = socres[j];
                    socres[j] = socres[j + 1];
                    socres[j + 1] = temp;
                }
            }
        }
    }
}

void sortDesc(double socres[])
{
    int i, j;
    double temp;
    for (i = 0; i < N - 1; i++)
    {
        {
            for (j = 0; j < N - i - 1; j++)
            {
                if (socres[j] < socres[j + 1])
                {
                    temp = socres[j];
                    socres[j] = socres[j + 1];
                    socres[j + 1] = temp;
                }
            }
        }
    }
}

void show(double scores[])
{
    int i;
    printf("********************************************\n");
    printf("Chinese\tMath\tEnglish\tPhysics\tChemistry\t\n");

    for (i = 0; i< N; i++)
    {
        printf("%.2lf\t", scores[i]);
    }
    printf("\n********************************************\n");
}

#include "stdafx.h"
#include <stdio.h>

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/*
计算图形的面积：
1. 圆的面积 = π * radius * radius
2. 矩形面积 = weight * height
3. 三角形面积 = 1/2 * weight * height
@author Xianpeng Shen
*/

double calcCircle(double);
double calcSquare(double, double);
double calcTriangle(double, double);
int validate(double);

int main()
{
    int choice;                // 用户选择
    double area;               // 图形面积
    double radius;             // 圆半径
    double weight, height;     // 图形的宽和高
    printf("1. 圆\n2. 矩形\n3. 三角形\n");
    printf("本系统支持三种图形面积计算，请选择：");
    scanf_s("%d", &choice);
    while (choice > 3 || choice < 1) {
        printf("只能输入1~3整数，请重新输入：");
        scanf_s("%d", &choice);
    }

    switch (choice)
    {
    case 1:
        printf("请输入圆的半径：");
        do
        {
            scanf_s("%lf", &radius);
            if (!(validate(radius))) {
                printf("不能为负数，请重新输入一个整数：");
            }
        } while (!validate(radius));
        area = calcCircle(radius);
        break;
    case 2:
        printf("请输入矩形的长和宽：");
        do
        {
            scanf_s("%lf%lf", &weight, &height);
            if (!validate(weight) || !validate(height)) {
                printf("不能为负数，请重新输入两个正数：");
            }
        } while (!validate(weight) || !validate(height));
        area = calcSquare(weight, height);
        break;
    case 3:
        printf("请输入三角形的底和高：");
        do
        {
            scanf_s("%lf%lf", &weight, &height);
            if (!validate(weight) || !validate(height)) {
                printf("不能为负数，请重新输入两个正数：");
            }
        } while (!validate(weight) || !validate(height));
        area = calcTriangle(weight, height);
        break;
    default:
        printf("只能输入1~3整数，请重新输入：");
        break;
    }
    printf("图形面积为：%.2lf\n", area);
}

double calcCircle(double radius)
{
    return 3.14 * radius * radius;
}

double calcSquare(double weight, double height)
{
    return weight * height;
}

double calcTriangle(double weight, double height)
{
    return weight * height / 2;
}

int validate(double num)
{
    return num > 0;        // 如果 num>0, 返回一个非零值，表示真。
}

#include <stdio.h>

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double power(double, int);  // 形式参数

int main()
{
    printf("%.2lf的%d次幂等于:%.2lf\n", 5.2, 2, power(5.2, 2));  //实际参数
    return 0;
}

double power(double num1, int num2) // 形式参数
{
    double result = 1;
    int i;
    for (i = 0; i < num2; i++)
    {
        result *= num1; // 累乘
    }
    return result;
}