#
#include<stdio.h>
void func(char str[100]);
int main()
{
char str[] = "fasfsdge";
char* p = str;
int n = 10;
printf("%d\n",sizeof(str));
printf("%d\n",sizeof(p));
printf("%d\n",sizeof(n));
func(str);
return 0;
}
void func(char str[100])
{
printf("%d\n",sizeof(str));
}
#include<stdio.h>
#include<memory.h>
int main()
{
int num = 0;
while(1)
{
printf("請輸入矩陣每邊的數(shù)字個數(shù)(個數(shù)必須大于1的奇數(shù))：");
scanf("%d",&num);
if(num>1 && num%2 == 1)
{
break;
}
else
{
printf("個數(shù)必須是大于1的奇數(shù)\n");
}
}
int *matrix = new int[num*num];
memset(matrix,0,num*num*sizeof(int));
int row = 0,col = 0;
row = 0;
col = (num-1)/2;
int i = 1;
while( i <= num*num)
{
if(col<0)
{
col = col+num;
}
col = col%num;
if(row<0)
{
row = row+num;
}
row = row%num;
if(matrix[row*num+col] != 0)
{
row +=2;
col--;
}
else
{
matrix[row*num+col]= i;
row--;
col++;
i++;
}
}
int ii = 0,jj =0;
for(; ii*num+jj<num*num; jj= ++jj%num)
{
if(jj == num-1)
{
printf("%d\n",matrix[ii*num+jj]);
ii++;
}
else
{
printf("%d\t",matrix[ii*num+jj]);
}
}
return 0;
}
void func(int m,int n)
{
int a[m*n];
int a[0] =9;
}
int main()
{
func(5,4);
return 0;
}
//上面的編譯無法通過
#include<stdio.h>
int main()
{
int *p = (int*)malloc(sizeof(int)*50);
for(int i = 0; i<50; i++)
{
*(p+i) = i+2;
}
int * q =p;
++q;
printf("value is %d\n",*p);
printf("value is %d\n",*q);
printf("value is %d\n",*(p+49));
printf("value is %d\n",*(q+49));
free(p);
printf("value is %d\n",*p);
printf("value is %d\n",*q);
printf("value is %d\n",*(q+1));
printf("value is %d\n",*(q+2));
return 0;
}
#include<stdlib.h>
#include<memory.h>
#include<string.h>
#include<stdio.h>
int func(void)
{
static int i = 0;
return ++i;
}
int a = 0;
char *p1;
int main()
{
int b ;
char s[]= "abc";
char *p2;
char *p3 ="123456";
static int c = 0;
p1 = (char*)malloc(10);
p2 = (char*)malloc(20);
int *p = &a;
p = &b;
p = &c;
strcpy(p1,"123456");
int i;
i = func();
i= func();
printf("%d\n",i);
return 0;
}
//使用VC內(nèi)存察看來觀察
摘要: //tcpsever.cpp#include"targetver.h"#define WIN32_LEAN_AND_MEAN#include<windows.h>#include<commctrl.h>#include<tchar.h>#include<winsock2.h>#include"resource.h"#include<s...
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// mfctime.cpp : 定義控制臺應用程序的入口點。
//
#include "stdafx.h"
#include "mfctime.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
// 唯一的應用程序對象
CWinApp theApp;
using namespace std;
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;
// 初始化 MFC 并在失敗時顯示錯誤
if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
{
// TODO: 更改錯誤代碼以符合您的需要
_tprintf(_T("錯誤: MFC 初始化失敗\n"));
nRetCode = 1;
}
else
{
// TODO: 在此處為應用程序的行為編寫代碼。
time_t t;
time(&t);
tm *newtime;
newtime = localtime(&t);
printf("%s",asctime(newtime));
//C++寫法
SYSTEMTIME tt;
GetLocalTime(&tt);
CString str;
str.Format(_T("%u/%u/%u %u:%u:%u:%u"),
tt.wYear, tt.wMonth, tt.wDay,
tt.wHour, tt.wMinute, tt.wSecond,
tt.wMilliseconds);
LPTSTR lpsz = new TCHAR[str.GetLength()+1];
_tcscpy(lpsz, str);
wprintf(L"%s",lpsz);
}
return nRetCode;
}
如果參數(shù)是'0'到'9'，那么返回非0，否則返回0
#include<stdio.h>
#include<string.h>
int main()
{
//找出后串在前串中的匹配的第一個指針。
char *str1 = "hdhgjgf";
char *str2 ="dh";
char *p = 0;
p = strstr(str1,str2);
printf("%s",p);
return 0;
}
#include<string.h>
#include<stdio.h>
int main()
{
FILE *pFile;
pFile = fopen("myfile.txt","w+");
char str[8] = "qwertyu";
fwrite(str,1,7,pFile);
long pos = ftell(pFile);
char ch = getc(pFile);
int ret = 0;
ret = printf("%d",pos);
ret = printf("%c",ch);
ret = fseek(pFile,-5,2);
if(ret != 0)
{
printf("wrong");
}
pos = ftell(pFile);
ch =getc(pFile);
ret = printf("%d",pos);
ret = printf("%c",ch);
char strbuf[6];
//rewind(pFile);
ret = fread(strbuf,1,3,pFile);
printf("%s",strbuf);
fclose(pFile);
return 0;
}