画国旗的，画不出来，看看是哪里出了问题

#include
#include

#define PI 3.14

void fivePointedStar(int radius, double startAngle)
{
double delta=2PI/5;
int points [5];
for (int i=0;i<5;i++)
{
printf[i]x=cos(startAngle+idelta2)radius;//计算x坐标
points[i].y=sin(startAngle+idelta2)*radius;//计算y坐标
}
solidpolygon(points,5);
}

int main(void)
{
int width=900;
// 高度为宽度的2/3

int height=width/3*2;
// 网格宽度

intgrid=width/2/15;
// 创建窗体

initgraph(width height) 
setbkcolor(RED);
cleardevice();
// 翻转坐标轴，设置填充颜色为黄色 

setaspectratio(1-1); 
setfillcolor(YELLOW):
setpolyfillmode(WINDING);
// 大五角星

setorigin(grid *5 grid *5);
fivePointedStar(grid*3,PI/2);
// 小五角星1

setorigin(grid *10, grid * 2);
double startAngle=atan(3.0/5.0)+PI; fivePointedStar(gridstartAngle);
// 小五角星2

setorigin(grid *12, grid * 4);
startAngle=atan(1.0/7.0)+PI: fivePointedStar(gridstartAngle);
// 小五角星3

setorigin(grid*12,grid *7);
startAngle=-atan(2.0/7.0)+PI fivePointedStar(grid, startAngle);
// 小五角星4

setorigin(grid *10, grid * 9);
startAngle=-atan(4.0/5.0)+PI: fivePointedStar(grid startAngle);
setcharQ; 
closegraph();

return 0;
}

你这代码都没复制全。程序需要easyx图形库。
支持g++版的 EasyX_20220610_mingw： https://download.csdn.net/download/apull/86446884

#include <graphics.h> //easyx
#include <math.h>
#include <stdio.h>

#define PI 3.14

void fivePointedStar(int radius, double startAngle)
{
    double delta = 2 * PI / 5;
    POINT points[5]; //
    for (int i = 0; i < 5; i++)
    {
        points[i].x = cos(startAngle + i * delta * 2) * radius; //计算x坐标
        points[i].y = sin(startAngle + i * delta * 2) * radius; //计算y坐标
    }
    solidpolygon(points, 5);
}

int main(void)
{
    int width = 900;
    // 高度为宽度的2/3

    int height = width / 3 * 2;
    // 网格宽度

    int grid = width / 2 / 15;
    // 创建窗体

    initgraph(width, height);
    setbkcolor(RED);
    cleardevice();
    // 翻转坐标轴，设置填充颜色为黄色

    setaspectratio(1, -1);
    setfillcolor(YELLOW);
    setpolyfillmode(WINDING);
    // 大五角星

    setorigin(grid * 5, grid * 5);
    fivePointedStar(grid * 3, PI / 2);
    // 小五角星1

    setorigin(grid * 10, grid * 2);
    double startAngle = atan(3.0 / 5.0) + PI;
    fivePointedStar(grid, startAngle);
    // 小五角星2

    setorigin(grid * 12, grid * 4);
    startAngle = atan(1.0 / 7.0) + PI;
    fivePointedStar(grid, startAngle);
    // 小五角星3

    setorigin(grid * 12, grid * 7);
    startAngle = -atan(2.0 / 7.0) + PI;
    fivePointedStar(grid, startAngle);
    // 小五角星4

    setorigin(grid * 10, grid * 9);
    startAngle = -atan(4.0 / 5.0) + PI;
    fivePointedStar(grid, startAngle);

    getchar(); //
    //  setcharQ;
    closegraph();
    return 0;
}

img