xbox Ubuntu SDL c程序运行报错（段错误）

Question

问题相关代码，请勿粘贴截图

#include <stdio.h>
#include <stdlib.h>
#include <SDL.h>
#include <string.h>
#include <math.h>
#include <SDL_draw.h>

int main(){
    SDL_Surface *screen = SDL_SetVideoMode(640,640,16,SDL_SWSURFACE);
    int x,i;
    x=0;
    double y;
    if(screen == NULL){
        fprintf(stderr,"SDL_SetVideoMode error %s\n",SDL_GetError());
        exit(1);
    }   
    if(SDL_Init(SDL_INIT_VIDEO) < 0){
        fprintf(stderr,"SDL_INIT_VIDEO error %s\n",SDL_GetError());
        exit(1);
    }
    atexit(SDL_Quit);
    for (i=0;i<120;i++,x=x+3,y=y+sin(x-80))
{
      Draw_Circle(screen,x,y,15,SDL_MapRGB(screen->format, 255,0,0));       
      SDL_Delay(100);  
    Draw_Circle(screen,x,y,15,SDL_MapRGB(screen->format, 255,255,255));
    Draw_Line(screen,x,y,x+3,y=y+sin(x-80),SDL_MapRGB (screen->format, 255,0,0));
    SDL_UpdateRect(screen, 0, 0, 0, 0);        /*更新整个屏幕*/ }
        return 0;
}

运行结果及报错内容

我想要达到的结果

成功运行，实现画一个圆，此圆沿着正弦曲线运动

Answer 1

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