书山有路勤为径

输出信息到文件中   #include<stdio.h> void main() { FILE *p; char ch='c'; p=fopen("1.txt","w+"); fputc(ch,p); }   从文件读取到程序中   #include<stdio.h> void main() { FILE ...

#include<stdio.h> struct student{ char name[10]; int number;} std,*p; void main() { std.name[0]='c'; std.number=10; p->name[0]='n'; p->number=100; printf("%c,%d\n",...

#include<stdio.h> int (*p)(int,int); int max(int a,int b); void main() { int a,b,c; a=1;b=2; p=max; c=(*p)(a,b); printf("%d",c); } int max(int a,int b){ ...

#include<stdio.h> #include<Winsock2.h> void main() { WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD( 2, 2 ); err = WSAStartup( wVersionReq...

#include<stdio.h> int main() { FILE *dest_p,*source_p; int ch; source_p=fopen("1.tar.gz","rb"); dest_p=fopen("2.tar.gz","wb"); while((ch=getc(source_p))!=EOF) { putc(ch,de...

malloc分配内存，free释放内存，结构体中的指针和结构体指针要通过malloc分配，使用完后，通过free释放并置于NULL,     #include<iostream> using namespace std; typedef struct _Birthday { int day; int month; int year; } Birthday;...