-
9 C++ C++ 1 ASCIITEXTASCII327675: 51 50 55 54 55
(ASCII)136.56649 51 54 46 53 54
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136.56float44float4
011111111111111101111111111111110011001100111110001101110011011000110111ASCII3276732767
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ASCII,,,, 2
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3 C++fstream.hifstream ofstreamfstream
C++(1). ifstream infile; ofstream outfile; fstream iofile;
- (2). (3). >>
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ifstream infile;ofsream outfile;fstream
file;infile.open(myfile_in.txt);
//outfile.open(myfile_out.txt);//file.open(myfile.txt, ios::in);//
ifstream infile(myfile_in.txt);ofstream
outfile(myfile_out.txt);fstream file(myfile.txt, ios::in);
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(2)
ios.henum open_mode{in = 0x01, //00000001out =
0x02,//00000010ate = 0x04,//00000100app = 0x08,//00001000 trunc =
0x10,//00010000 nocreate = ox20,//00100000noreplace =
0x40,//01000000binary = 0x80//10000000};
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|ios::out | ios::ate //ios::in | ios::binary//ios::out |
ios::trunc//
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ios::inios::outios::app
ios::ateios::inios::ateios::appios::trunc0ios::outios::app,
ios::ate,
ios::inios::nocreateios::noreplaceios::ateios::appios::binary
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:ifstreamopenopen(const char *, int = ios::in, int =
filebuf::openprot);ios::in;
ofstreamopenopen(const char *, int = ios::out, int =
filebuf::openprot);ios::out;
fstreamopenopen(const char *, int, int = filebuf::openprot);(3)
close
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ifstreamofstreamfstreamclose( ); infile.close( ), outfile.close(
), file.close( ); (4) 0
ifstream f1(file.dat);if(!f1){cout
- char filename[256];coutfilename;ofstream
f5;f5.open(filename);if(!f5){cout
- #include#includevoid main(void){char filename_in[256],
filename_out[256];cout>filename_out;ifstream
infile(filename_in);//ifstream
infile;if(!infile){//infile.open(filename_in);cout
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2 char ch; // while(infile.get(ch)) // outfile.put(ch); //ch
infile.close( ); outfile.close( );
3 char buff[300]; while(infile.getline(buff,300))
//\noutfile
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6C++ C++read( )write( )read(char *buf, int size);
sizebufwrite(char *buf, int size);bufsize
- 1~500data.dat#include#includevoid main(void){ ofstream
outfile("d:\\source\\data.dat",ios::out|ios::binary);if(!outfile){cout
- data.dat10 #include#includevoid main(void){ifstream
infile("d:\\source\\data.dat",ios::binary);if(!infile){cout
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4While(!infile.eof( )){infile.read(buf, 4096);outfile.write(buf,
4096);} //eof( )00
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7 C++C++istreamostreamistream seekg(long
streampos);stramposseekg(long streamoff,
seek_dir);seek_dirstreamofftellg( );
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ostream seekp(long streampos);stramposseekp(long streamoff,
seek_dir);seek_dirstreamofftellp( );
Seek_dirios::beg0ios::cur1ios::end2
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infile.seekg(500);//500infile.seekg(-100,ios::cur);
//100infile.seekg(100,ios::cur);//100outfile.seekp(-100,ios::end);//100
1.streamoff 2. 0
- 5~100020~30#include#includevoid main(void){ ofstream
outfile(data.dat,ios::out|ios::binary); int i; for(i=5;i
- A129999#include#include#includevoid main(void){int num,
i;fstream
fp;fp.open("a:\\data1.txt",ios::in|ios::out|ios::binary);if(!fp){cout
- 9.9C++>>
- inventory::inventory(string des,string no,int quan, double
cost,double ret){ Description=des; No=no; Quantity=quan; Cost=cost;
Retail=ret;}ostream &operator
- int main( ){ inventory
car1("2000","805637928",156,80000,105000),car2; inventory
motor1("125","93612575",302,10000,13000),motor2; ofstream
distfile("d:\\Ex9_9.data"); distfile
