請問大神們為什么最后一行顯示missing return value 怎么修改

ID:793358 · 發表于 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 · 發表于 2020-6-30 00:25

剛進這個網站，也不知道這樣合不合規

ID:584814 · 發表于 2020-6-30 07:54

void main(void) 改成 int main(void) 或 main(void) 試試

ID:592807 · 發表于 2020-6-30 08:25

錯誤標記在哪？missing return vaul一般是指函數忘記加return值了

ID:658665 · 發表于 2020-6-30 08:38

下次發帖的時候最好把代碼縮進搞一下，這個程序的問題是del(yj)前面沒有加void,只要改為void del(yj)就行了，下面是你的程序

ID:744327 · 發表于 2020-6-30 08:39

直接修改return value的值，最后一行就有變化了。

ID:784974 · 發表于 2020-6-30 08:57

這個只是警告，和錯誤不同，錯誤的話不能生成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)定義的函數最后面加一個return（），括號里看你需要添加返回什么吧。
希望有所幫助，如有錯誤也請指正，謝謝

ID:452950 · 發表于 2020-6-30 10:26

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

   }
這個應該是延時函數，定義函數名前要加void

ID:793358 · 發表于 2020-6-30 11:11

黃youhui 發表于 2020-6-30 08:25
錯誤標記在哪？missing return vaul一般是指函數忘記加return值了

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請問大神們為什么最后一行顯示missing return value 怎么修改