专题二 符号的技巧---- 14.优先级和类型转换分析

#include<stdio.h>
#include<malloc.h>
typedef struct _demo
{
int* pInt;
float f;
}Demo;

int func(int v,int m)
{
return (v&m !=0);          //((v&m)!=0)
}

int main()
{
Demo* pD=(Demo*)malloc(sizeof(Demo));
int  *p[5];                //int* p[5];
int  *f();                 //int* f();
int i=0;
i=1,2;                   //(i=1),2;

*pD.f=0;                //*pD->f=0;
free(pD);
return 0;
}

#include <stdio.h>
int main()
{
int i=-2;
unsigned int j=1;
if((i+j)>0)
{
printf(“i+j>0”);
}
printf(“i+j=%d\n”,i+j);
}
//结果：i+j>0    i+j=-1
//负数以补码（反码加一）存储
//-2=0xFFFFFFFE  +1  -->0xFFFFFFFF(unsinged int)  -->-1(int)