switch.c(51): error C141: syntax error near 'void'啊啊啊，这里不知道咋回事了 - 编程论坛

#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint  unsigned int
sbit S1=P1^0;
sbit S2=P1^1;
uchar code seg[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};//¹²ÑôLEDÊýÂë¹Ü¶ÎÂë±í
void plus(void);//º¯Êýµ÷ÓÃÉùÃ÷
void minus(void);
void key_scan(void);
uchar keyval;
void delay(uint t)      //ÑÓÊ±º¯Êý
{
    uchar j;
  while(t --)
  for(j=0;j<200;j++);
}
void main()   //Ö÷º¯Êý
{
    while(1)
    key_scan();


switch(keyval)//ÅÐ¶Ïp1¿ÚµÍÁ½Î»µÄ×´Ì¬
{
    case 0:
       break;
    case 2: plus();
        break;
    case 1: minus();
       break;
    case 3:
       break;
}

}

void plus(void)    //ÕýÏòÑ»·º¯Êý
{
    uchar i;
    while(1)
{
    for(i=0;i<10;i++)
    {
    P0=seg[i];
    delay(700);
    if(seg[i]==0x90)
    i=0;
    }
}
void minus(void)    //·´ÏòÑ»·º¯Êý
{
    uchar i;
    while(1)