请问大神们为什么最后一行显示missing return value 怎么修改

ID:793358 · 发表于 2020-6-29 23:43

                  /*12Mhz晶振工作*/
#include <reg51.h>
#define uint unsigned int
#define uchar unsigned char
sbit voice=P2^3;
uchar code sound[]={0xff,
                  0x2b,0x30,0x30,0x10,0x2b,0x30,0x30,0x10,0x2b,0x20,0x26,0x20,0x20,0x20,
                  0x26,0x20,0x2b,0x30,0x30,0x10,0x2b,0x30,0x30,0x10,0x2b,0x10,0x26,0x10,
                  0x2b,0x10,0x30,0x10,0x40,0x20,0x40,0x20,0x2b,0x30,0x30,0x10,0x2b,0x30,
                  0x30,0x10,0x2b,0x20,0x26,0x20,0x20,0x20,0x26,0x20,0x2b,0x30,0x26,0x10,
                  0x2b,0x20,0x30,0x20,0x2b,0x20,0x2b,0x20,0xff,0x20,0xff,0x20,0x2b,0x30,
0x30,0x10,0x2b,0x30,0x30,0x10,0x2b,0x20,0x26,0x20,0x20,0x20,0x26,0x20,
0x2b,0x30,0x26,0x10,0x2b,0x20,0x30,0x20,0x39,0x20,0x39,0x20,0x26,0x10,
0x2b,0x10,0x30,0x10,0x2b,0x10,0x30,0x20,0x30,0x20,0x26,0x10,0x2b,0x10,
0x30,0x10,0x2b,0x10,0x30,0x30,0x20,0x10,0x26,0x10,0x2b,0x10,0x30,0x10,
0x2b,0x10,0x30,0x20,0x30,0x20,0x30,0x20,0x2b,0x20,0x26,0x20,0x30,0x20,0x1c,0x20,0x20,0x10,0x1c,0x10,
                  0x1c,0x30,0x30,0x10,0x19,0x20,0x1c,0x10,0x19,0x10,0x19,0x20,0x19,0x20,
                  0x1c,0x10,0x19,0x10,0x19,0x20,0x26,0x20,0x18,0x10,0x15,0x10,0x18,0x10,
                  0x19,0x10,0x1c,0x20,0x20,0x20,0x1c,0x20,0x20,0x10,0x1c,0x10,0x1c,0x10,
                  0x20,0x10,0x1c,0x10,0x20,0x10,0x1c,0x20,0x20,0x10,0x2b,0x10,0x2b,0x10,
                  0x20,0x20,0x20,0x10,0x26,0x20,0x26,0x20,0x30,0x20,0x2b,0x20,0x26,0x20,
                  0x30,0x20,0x1c,0x20,0x20,0x10,0x1c,0x10,0x1c,0x30,0x30,0x10,0x19,0x20,
                  0x1c,0x10,0x19,0x10,0x19,0x20,0x19,0x20,0x1c,0x10,0x19,0x10,0x19,0x20,
                  0x26,0x20,0x18,0x10,0x15,0x10,0x18,0x10,0x19,0x10,0x1c,0x20,0x20,0x20,
                  0x1c,0x20,0x13,0x10,0x13,0x10,0x13,0x20,0x20,0x20,0x1c,0x20,0x13,0x10,
                  0x13,0x10,0x13,0x10,0x20,0x20,0x1c,0x10,0x1c,0x20,0x1c,0x20,0x1c,0x20,
                  0x1c,0x20,0xff,0x20,0xff,0x20,  0x18,0x20,0x15,0x20,0x13,0x20,0x0e,0x10,0x10,0x10,0x10,0x20,0x0e,0x10,
                  0x10,0x10,0x10,0x20,0x0e,0x10,0x10,0x10,0x10,0x20,0x19,0x10,0x18,0x10,
                  0x18,0x20,0x0e,0x10,0x10,0x10,0x10,0x20,0x0e,0x10,0x10,0x10,0x10,0x20,
                  0x0e,0x10,0x10,0x10,0x10,0x10,0x13,0x30,0x15,0x20,0x18,0x10,0x1c,0x10,
                  0x1c,0x10,0x18,0x20,0x1c,0x10,0x15,0x10,0x18,0x10,0x1c,0x20,0x1c,0x10,
                  0x18,0x30,0x13,0x20,0x13,0x20,0x13,0x10,0x12,0x10,0x13,0x20,0x13,0x10,
                  0x15,0x20,0xff,0x20,0xff,0x20,0x18,0x20,0x15,0x20,0x13,0x20,0x0e,0x10,0x10,0x10,
                  0x10,0x20,0x0e,0x10,0x10,0x10,0x10,0x20,0x0e,0x10,0x10,0x10,0x10,0x20,
                  0x15,0x20,0x13,0x20,0x0e,0x10,0x10,0x10,0x10,0x20,0x0e,0x10,0x10,0x10,
                  0x10,0x20,0x0e,0x10,0x10,0x10,0x10,0x10,0x13,0x30,0x15,0x20,0x18,0x10,
                  0x1c,0x10,0x1c,0x10,0x13,0x30,0x15,0x20,0x18,0x10,0x1c,0x10,0x1c,0x10,
                  0x18,0x30,0x18,0x20,0x18,0x20,0xff,0x20,0xff,0x20,0x1c,0x10,0x13,0x10,

                  0x15,0x20,0x18,0x10,0x1c,0x10,0x1c,0x10,0x13,0x30,0x15,0x20,0x18,0x10,
                  0x1c,0x10,0x1c,0x10,0x18,0x30,0x18,0x20,0x18,0x20,0x18,0x20,0x18,0x20,0x00,
               };
uchar zdjs=0, jp;
del(yj);
void main(void)
  {
   uint dpjs=0;
   uchar yj;
   TMOD=0x01,IE=0x82;
   TH0=0xd8, TL0=0xef;
TR0=1;
while(1)
{
   zdjs=0;
   dpjs++; yj=sound[dpjs];
   dpjs++; jp=sound[dpjs];
while(zdjs!=jp)
   {
   if(yj!=0xff)
{
         if(yj!=0)
            {
         voice=!voice;
               del(yj);
            }
            else
      {
      dpjs=0;
                  break;
                  }
}
else
   {
      voice=0;
               del(jp);
}
   }
   }
}
time0() interrupt 1  using 1
   {
      TH0=0xd8, TL0=0xef;
      zdjs++;
         }
del(yj)
{
   uchar yj2=2;
   while(yj!=0)
      {
            while(yj2!=0)
               {
                  yj2--;
                  }
               yj2=2;
         yj--;
   }

   }

ID:793358 · 发表于 2020-6-30 00:25

刚进这个网站，也不知道这样合不合规

ID:584814 · 发表于 2020-6-30 07:54

void main(void) 改成 int main(void) 或 main(void) 试试

ID:592807 · 发表于 2020-6-30 08:25

错误标记在哪？missing return vaul一般是指函数忘记加return值了

ID:658665 · 发表于 2020-6-30 08:38

下次发帖的时候最好把代码缩进搞一下，这个程序的问题是del(yj)前面没有加void,只要改为void del(yj)就行了，下面是你的程序

ID:744327 · 发表于 2020-6-30 08:39

直接修改return value的值，最后一行就有变化了。

ID:784974 · 发表于 2020-6-30 08:57

这个只是警告，和错误不同，错误的话不能生成HEX文件，警告可以生成HEX文件。
然后就是看你需要返回什么值，可以在del(yj)定义的函数最后面加一个return（），括号里看你需要添加返回什么吧。
希望有所帮助，如有错误也请指正，谢谢

ID:452950 · 发表于 2020-6-30 10:26

void del(yj)
{
   uchar yj2=2;
   while(yj!=0)
      {
            while(yj2!=0)
               {
                  yj2--;
                  }
               yj2=2;
         yj--;
   }

   }
这个应该是延时函数，定义函数名前要加void

ID:793358 · 发表于 2020-6-30 11:11

黄youhui 发表于 2020-6-30 08:25
错误标记在哪？missing return vaul一般是指函数忘记加return值了

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