#include<reg52.h>
#define uc unsigned char
#define ui unsigned int
uc code tabledub[]={~0x3F,~0x06,~0x5B,~0x4F,~0x66,~0x6D,
~0x7D,~0x07,~0x7F,~0x6F,~0x77,~0x7C,~0x39,~0x5E,~0x79,~0x71};
uc b,temp,b1;
void delay(uc x)
{
    ui y;
    for(;x!=0;x--)
        for(y=1100;y>0;y--);     
}
uc keyscan();
main()
{
    while(1)
    {   
         b1=keyscan();
        P3=tabledub[b1];
    }
}uc keyscan();
{
        P3=0xfd;
        temp=P3;
        temp=temp&0xf0;
        while(temp!=0xf0)
        {
            delay(3);
            while(temp!=0xf0)
            {
                temp=P3;
                switch(temp)
                {
                    case 0xed:b=0;
                        break;
                    case 0xdd:b=1;
                        break;
                    case 0xbd:b=2;
                        break;
                    case 0x7d:b=3;
                        break;
                }
//                P1=tabledub[b];
                temp=temp&0xf0;
            }
//            temp=temp&0xf0;            
        }   
        P3=0xfb;
        temp=P3;
        temp=temp&0xf0;
        while(temp!=0xf0)
        {
            delay(3);
            while(temp!=0xf0)
            {
                temp=P3;
                switch(temp)
                {
                    case 0xeb:b=4;
                        break;
                    case 0xdb:b=5;
                        break;
                    case 0xbb:b=6;
                        break;
                    case 0x7b:b=7;
                        break;
                }        
//                P1=tabledub[b];
                temp=temp&0xf0;
            }
//            temp=temp&0xf0;
        }
        P3=0xf7;
        temp=P3;
        temp=temp&0xf0;
        while(temp!=0xf0)
        {
            delay(3);
            while(temp!=0xf0)
            {
                temp=P3;
                switch(temp)
                {
                    case 0xe7:b=8;
                        break;
                    case 0xd7:b=9;
                        break;
                    case 0xb7:b=10;
                        break;
                    case 0x77:b=11;
                        break;
                }
//                P1=tabledub[b];
                temp=temp&0xf0;
            }
//            temp=temp&0xf0;   
        }
    return b;
}
结果显示有错误，点击错误提示老弹出“.......包含不可用路径”这是怎么回事？

估计你没把这个文件加到工程里。

我编译了你的程序，只有一处错误，你的子函数uc keyscan()在写的时候多了一个分号（main函数后面），你说的那个问题我没有遇到，你再看看！！

我也试过了，和楼上的情况一样，只在子函数uc keyscan();后的分号去掉就没有错误了

嗯，后来也没出现那情况了~~~纠结啊，都不知道为啥会出现那情况呢``````

把声明和定义搞混了 可能是