POINTERS ON C【C和指针】 - 好文

#include<iostream> #include<algorithm> #include<cstdio> #include<cstring>
#include<math.h> #include<set> using namespace std; const int maxn = 500+10;
#define MUL(x,y) ++x*++y int f1(int x){ return x+5; } int f2(int x){ return
2*x-1; } int func(int x){ int countx=0; while(x){ printf("%d\t%d\n",countx,x);
countx++; x=x&(x-1); } return countx; } int func(int x,int y){ return x+y; }
int main(){ //选择1 char s[]="123",*p=NULL; p=s;
printf("%c%c%c\n",*p++,*p++,*p++);//321 //2 int i=0,a=1,b=2,c=3;
i=++a||++b||++c;//++a之后a=2，返回为真（i=1），后边不再执行 printf("%d %d %d %d\n",i,a,b,c);//1
2 2 3 //3 a=1,b=2,c=3; printf("%d\n",MUL(a+b,b+c)); printf("%d %d %d\n",a,b,c);
//printf("%d\n",MUL(a,b)); //printf("%d\n",++a*++b); //4 int u=010,v=0x10,w=10;
printf("%d,%d,%d\n",u,v,w); //5 int (*p1)(int),(*p2)(int),(*t)(int),y1,y2;
p1=f1; p2=f2; y1=p2(p1(1)); t=p1; p1=p2; p2=t; y2=p2(p1(2));
printf("%d,%d\n",y1,y2); //6 printf("%d\n",func(9981)); //7 char
*S="\ta\018bc";//\0表示后面的字符是八进制数 int num=0; for(;*S!='\0';S++) printf("%d
",*S);//6个字符：\t,a,\01,8,b,c printf("\n"); //8 int A=1,B=2,C=3,D=4,E=5;
printf("%d\n",func((A+B,B+C,C+A),(D+E)));//func(C+A,D+E)=13,逗号表达式 return 0; }

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