[問題] 用C寫音樂程式
#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!!
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