[問題] 用C寫音樂程式

[a1013944 (ㄚ春)]

#include<stdio.h>
#include<time.h>
#include<stdlib.h>
void delay(secs)
float secs;
{
  clock_t end;
  end=(int)(secs*CLOCKS_PER_SEC)+clock();
  while(clock()<end);
}
static int portvalue=0;
void sound(unsigned freq)
{
     int portdata;
     _outp(0x43,0xb6);
     freq=(unsigned)(1193180L/freq);
     _outp(0x42,(char)freq);
     _outp(0x42,(char)(freq>>8));
     portdata=_inp(0x61);
     if(portvalue==0)
     portvalue=portdata;
     _outp(0x61,portvalue | 0x3);

}

void nosound()
{
 _outp(0x61,portvalue) ;

}
void main()
{
     unsigned freq[]={523,587,659,523,523,587,659,523,
                      659,698,784,  0,659,698,784,  0,
                      784,880,784,698,659,523,
                      784,880,784,698,659,523,
                      523,329,523,  0,523,392,523,  0};
     double duration[]={0.5,0.5,0.5,0.5,0.5,0.5,0.5,0.5,
                        0.5,0.5,0.5,0.5,0.5,0.5,0.5,0.5,
                        0.25,0.25,0.25,0.25,0.5,0.5,
                        0.25,0.25,0.25,0.25,0.5,0.5,
                        0.5,0.5,0.5,0.5,0.5,0.5,0.5,0.5 };
   int i;
   for(i=0;i<36;i++)
   {
     if(freq[i]>0)
     sound(freq[i]);
     delay(duration[i]);
   }
   nosound();
system("pause");

}
他回給我的是錯誤 在32行
[Warning] return type of 'main' is not `int'

有人可以幫我改一下嗎 謝謝!!

--
※ 發信站: 批踢踢實業坊(ptt.cc) 
◆ From: 140.123.237.33
→ james732:在 system("pause") 與 } 間插一行 return 0;
→ james732:void main() 改成 int main();
→ james732:上面的 ; 是多餘的 int main() 就好
→ a1013944:感謝你 沒有錯了 可是...按下執行後畫面就會跳掉@@
推 Bencrie:唔 ... 都是low level I/O耶，這是給Win32跑的 ??
→ a1013944:小弟剛學@@  那個是什麼?? 我用學校寫C的平台跑的><