這是一個7段數碼管循環顯示數字的程序- #include "reg52.h"
- #include "intrins.h"
- #define uchar unsigned char
- #define uint unsigned int
- #define out P0
- uchar code seg[]={0xc0,0xa4,0x99,0x82,0x80,0xf9,0xb0,0x92,0xf8,0x90,0x01};
- void delayms(uint);
- void main(void)
- {
- uchar i;
- while(1)
- {
- out=seg[i];
- delayms(900);
- i++;
- if(seg[i]==0x01)i=0;
- }
- }
- void delayms(uint j)
- {
- uchar i;
- for(;j>0;j--)
- {
- i=250;
- while(--i);
- i=249;
- while(--i);
- }
- }
為啥在main函數前面要多寫一行void delayms(uint);不寫這一行編譯就會出錯
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