用C语言编写程序：在同一直角坐标系上输出以下两个方程图形。 y1=sinx, y2=x/3 其中，-π/2≤x≤π/2

如题所述

推荐答案 2011-03-30

Turbo C 图形模式画图 π/2 取近似值1.57#include #include #include #define LEN 100 /*100个点表示长度1*/int main(){ int x; int y; int gdriver = DETECT; int gmode; initgraph(&gdriver,&gmode,"C:\\TC20\\BGI"); cleardevice(); setcolor(RED); line(0,240,640,240); line(320,0,320,480); setcolor(YELLOW); setlinestyle(1,0,1); line(0,40,640,40); line(0,140,640,140); line(0,340,640,340); line(0,440,640,440); line(20,0,20,480); line(120,0,120,480); line(220,0,220,480); line(420,0,420,480); line(520,0,520,480); line(620,0,620,480); for( x = 320 - 157; x { y = 240 - (int)(LEN * (x-320)/100.0/3); putpixel(x,y,WHITE); } for( x = 320 - 157; x { y = 240 - (int)(LEN * sin((x-320)/100.0)); putpixel(x,y,GREEN); } getch(); closegraph(); return 0;}效果图