我编译时，显示lianxi_jianpan.c(54): warning C206: 'dispay': missing function-prototype
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit dula=P2^6;
sbit wela=P2^7;
uchar key;
uchar temp;
uchar code table[]=
{ 0x3f , 0x06 , 0x5b , 0x4f ,
0x66 , 0x6d , 0x7d , 0x07 ,
0x7f , 0x6f , 0x77 , 0x7c ,
0x39 , 0x5e , 0x79 , 0x71 };
void delay(uint z)
{
uint i,j;
for(i=z;i>0;i--)
{for(j=110;j>0;j--);}
}
display(uchar num)
{
dula=1;
P0=table[num];
dula=0;
}
saomiao_key()
{
P3=0xfe;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(20);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{case 0xee:
key=0; break;
case 0xde:
key=1; break;
case 0xbe:
key=2; break;
case 0x7e:
key=3; break;
}
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
dispay(key);
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(20);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xed:
key=4; break;
case 0xdd:
key=5; break;
case 0xbd:
key=6; break;
case 0x7d:
key=7; break;
}
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
dispay(key);
}
P3=0xfb;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(20);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xeb:
key=8; break;
case 0xdb:
key=9; break;
case 0xbb:
key=10; break;
case 0x7b:
key=11; break;
}
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
dispay(key);
}
P3=0xf7;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(20);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xe7:
key=12; break;
case 0xd7:
key=13; break;
case 0xb7:
key=14; break;
case 0x77:
key=15; break;
}
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
dispay(key);
}
}
main()
{
P0=0;
dula=1;
dula=0;
P0=0xc0;
wela=1;
wela=0;
while(1)
saomiao_key();
}
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