//使用位操作运算和选择程序结构实现流水效果
#include <reg51.h>
#define uchar unsigned char
void delay(uint ms);
void main(void)
{
P1=0xfe;
while(1)
{
delay(500);
if(P1==0x7f)
{
P1=0xfe;
delay(500);
}
P1=P1<<1|0x01;
}
}
void delay(uint ms)
{
uchar i;
uint j;
for(j=0;j<ms;j++)
for(i=0;i<125;i++)
;
}
输出信息提示如下:
Build target '目标 1'
compiling 选择结构流水灯.c...
选择结构流水灯.C(3): error C141: syntax error near 'ms', expected ')'
选择结构流水灯.C(18): error C141: syntax error near 'ms', expected ')'
选择结构流水灯.C(21): error C141: syntax error near 'j'
选择结构流水灯.C(21): error C202: 'j': undefined identifier
选择结构流水灯.C(22): error C202: 'j': undefined identifier
目标未创建
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