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#include<reg52.h>
typedef unsigned char uint8;
typedef unsigned int uint16;

uint8 code smgdu[]={0x3f,0x06,0x5b,0x4f,0x66,
                    0x6d,0x7d,0x07,0x7f,0x6f};
sbit smgen=P2^3;
sbit rs=P3^6;

void delay(uint16 k)
{
     uint16 i,j;
    for(i=0;i<k;i++)
    {
        for(j=0;j<121;j++)
    {;}
    }
}

void main()
{
    uint8 x=30;
    uint16 y=55;
    uint16 z;
    rs=0;

    z=x*y;
        while(1)
        {
            smgen=1;
            P1=smgdu[z/1000];
            P2=0x30;
            delay(1);

//            smgen=1;
            P1=smgdu[z%1000/100];
            P2=0x20;
            delay(1);
        
//            smgen=1;
            P1=smgdu[z%100/10];
            P2=0x10;
            delay(1);

//            smgen=1;
            P1=smgdu[z%10];
            P2=0x00;
            delay(1);

        }
}
结果1110；

            smgen=1;
            P1=smgdu[z/1000];
            P2=0x30;
            delay(1);

            smgen=1;
            P1=smgdu[z%1000/100];
            P2=0x20;
            delay(1);
        
//            smgen=1;
            P1=smgdu[z%100/10];
            P2=0x10;
            delay(1);

//            smgen=1;
            P1=smgdu[z%10];
            P2=0x00;
            delay(1);
结果1668

        while(1)
        {
            smgen=1;
            P1=smgdu[z/1000];
            P2=0x30;
            delay(1);

            smgen=1;
            P1=smgdu[z%1000/100];
            P2=0x20;
            delay(1);
        
            smgen=1;
            P1=smgdu[z%100/10];
            P2=0x10;
            delay(1);

//            smgen=1;
            P1=smgdu[z%10];
            P2=0x00;
            delay(1);
结果1658

void main()
{
    uint8 x=30;
    uint16 y=55;
    uint16 z;
    rs=0;

    z=x*y;
        while(1)
        {
            smgen=1;
            P1=smgdu[z/1000];
            P2=0x30;
            delay(1);

            smgen=1;
            P1=smgdu[z%1000/100];
            P2=0x20;
            delay(1);
        
            smgen=1;
            P1=smgdu[z%100/10];
            P2=0x10;
            delay(1);

            smgen=1;
            P1=smgdu[z%10];
            P2=0x00;
            delay(1);

        }
}
结果正解1650

这个数码管的全能太重要了