代码易错的例子

示例1：

#include "stdio.h"void main(){int i = 1;if(0 != i);{printf("i的取值不为0");/* if条件满足时处理流程*/}}

示例2：

#include "stdio.h"typedef struct trqcUeInst{int ueidx;int mcs;int transmode;}TrqcUeInst;void main(){TrqcUeInst * ptrqcUeInst = NULL;TrqcUeInst tUeInst;//ptrqcUeInst = &tUeInst;printf("%d",ptrqcUeInst->ueidx);}

示例3：

#include "stdio.h"void main(){unsigned int x = 0xffffffff;unsigned int result1 = 0;unsigned int result2 = 0;unsigned int result3 = 0;printf("%u\n",x);x = 0xefffffff;printf("%u\n",x);result1 = (x * 100) >> 9;result2 = (unsigned int)(((unsigned long long)(x * 100)) >> 9)//这种方式强转是错误的，因为是先乘100后已经溢出，再转为64位已失效。result3 = (unsigned int)(((unsigned long long)x * 100) >> 9);printf("%u\n",result1);printf("%u\n",result2);printf("%u\n",result3);}