#include"string.h"
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#include"stdio.h"
intmain(void)
{
inti,j;
inta[2][3]={{1,2,3},{4,5,6}};
intb[2][3];
memcpy(b[0][0],a[0][0],24);
printf("%d",b[1][0]);
}
扩展资料
#includestdio.h
#includestring.h
#includestdlib.h
voidprintarr2d(int(*a)[3],introw,intcol);
intmain()
{
inti,j;
inta[2][3]={{1,2,3},{4,5,6}};
intb[4][3]={{0,0,0},{0,0,0}};
memcpy(b[2],a,sizeof(int)*2*3);
printarr2d(b,4,3);
return0;
}
/***********************************************
打印显示数组
************************************************/
voidprintarr2d(int(*a)[3],introw,intcol)
{
inti,j;
for(i=0;irow;i++)
{
for(j=0;jcol;j++)
{
printf("%d",a[i][j]);
}
printf("\n");
}
}
C++ 复制函数
一、场景一：全部默认
#include
class base
{
public:
base()
{
}
base(int dt):
data(dt){
}
void get()
{
printf("base::data = %d\n",data);
}
public:
int data;
};
class derived:public base
{
public:
derived()
{
}
derived(int dt,int ddt):
base(dt),ddata(ddt)
{
}
void get()
{
base::get();
printf("derived::ddata = %d\n",ddata);
}
private:
int ddata;
};
int main()
{
derived da(1,5);
derived db(2,10);
da.get();
db.get();
da = db;
da.get();
db.get();
derived dc(da);
dc.get();
base ba(da);
ba.get();
getchar();
}
场景二、基类默认，派生类自定义
#include
class base
{
public:
base()
{
}
base(int dt):
data(dt)
{
}
void get()
{
printf("base::data = %d\n",data);
}
public:
int data;
};
class derived:
public base
{
public:
derived()
{
}
derived(int dt,int ddt)
:base(dt),ddata(ddt)
{
}
derived(const derivedd)
{
printf("call derived::copy construct function.\n");
ddata = d.ddata;
}
derived operator=(const derivedd)
{
printf("call derived::operator= function.\n");
ddata = d.ddata;
return *this;
}
void get()
{
base::get();
printf("derived::ddata = %d\n",ddata);
}
private:
int ddata;
};
场景三、基类自定义，派生类默认
#include
class base
{
public:
base()
{
}
base(int dt):
data(dt)
{
}
base(const baseb)
{
printf("call base::copy construct function.\n");
data = b.data;
}
base operator=(const based)
{
printf("call base::operator= function.\n");
data = d.data;
return *this;
}
void get()
{
printf("base::data = %d\n",data);
}
public:
int data;
};
class derived:public base
{
public:
derived()
{
}
derived(int dt,int ddt):
base(dt),ddata(ddt)
{
}
void get()
{
base::get();
printf("derived::ddata = %d\n",ddata);
}
private:
int ddata;
};
场景四、基类派生类都自定义
#include
class base
{
public:
base()
{
}
base(int dt):
data(dt)
{
}
base(const baseb)
{
printf("call base::copy construct function.\n");
data = b.data;
}
base operator=(const based)
{
printf("call base::operator= function.\n");
data = d.data;
return *this;
}
void get()
{
printf("base::data = %d\n",data);
}
public:
int data;
};
class derived:public base
{
public:
derived()
{
}
derived(int dt,int ddt):
base(dt),
ddata(ddt)
{
}
derived(const derivedd):base(d)
{
printf("call derived::copy construct function.\n");
ddata = d.ddata;
}
derived operator=(const derivedd)
{
printf("call derived::operator= function.\n");
ddata = d.ddata;
return *this;
}
void get()
{
base::get();
printf("derived::ddata = %d\n",ddata);
}
private:
int ddata;
};
strcpy(t[i],a[j],n);该语句的意思是：将某已知二维数组a的第j行前n个字符复制到另一个二维数组t的第i行中。给分吧
#include stdio.h
#includestring.h
int main()
{
char ch[40];
char c[20]={"asdfgh"};
strcpy(ch,c);
printf("%s\n",ch);
}
