Reading a line of characters in C ++

Header file <fstream>. It is best not to use fstream. h. when I was writing a program, I found that the latter would produce unsatisfactory output. The specific reason is unclear, probably due to the C ++ standard problem.

 

Solution1:

E. G.1

Char STR [90];
Infile> STR;
OUTFILE <STR <Endl;
Infile> STR;
OUTFILE <STR <Endl;
Infile> STR;
OUTFILE <STR <Endl;

Infile format:

* *************** Kusdafi ********************

* ************* Hlkafshd *********************

* *********** Hkalsf ** 8

Output file OUTFILE format: (keep consistent with infile)

* *************** Kusdafi ********************

* ************* Hlkafshd *********************

* *********** Hkalsf ** 8

Program Description: Str [90] can be read into a line of characters through infile> STR, as long as the number of characters in this line is smaller than 89 (the ending character '/0' is to be stored in the last position), you can read it and use OUTFILE <STR <Endl; output in the inverted output file.

Disadvantage: When this line contains spaces, infile> STR can only end when spaces are read.

Program effect when spaces exist: Input File Format

1234 5678

9001 90002

Corresponding output file format:

1234

5678

9001

 

Solution2:

Advantage: The Getline statement can be used to read a row without spaces.

E.g.

Char starsingnaltemp1 [81];
Char starsingnaltemp2 [81];
Char starsingnaltemp3 [81];

Infile. Getline (starsingnaltemp1, 81, '/N ');

Infile. Getline (starsingnaltemp2, 81, '/N ');
Infile. Getline (starsingnaltemp3, 81, '/N ');

OUTFILE. Write (starsingnaltemp1, 80 );

OUTFILE <Endl;
OUTFILE. Write (starsingnaltemp2, 80 );

OUTFILE <Endl;
OUTFILE. Write (starsingnaltemp3, 80 );
OUTFILE <Endl;

OUTFILE <"0 1 0" <Endl;

Explanation:

Infile. Getline (starsingnaltemp1, 81, '/N ');

Read a line of characters. When '/N' (carriage return) is encountered, the read operation is completed. A maximum of 80 characters (excluding strings)

Terminator '/0'), and 81st-bit save Terminator. Here, this sentence is equivalent to infile. Getline (starsingnaltemp1, 81 );

If it is written as infile. Getline (starsingnaltemp1, 80), and a row in the file is exactly 80 characters, the function reports an error, with one less bucket.

OUTFILE. Write (starsingnaltemp1, 80 );

Write the 80 characters stored in the array into the output file. Note that the 80 characters do not contain the count of the terminator '/0'.

The 80-bit ending character should be written as OUTFILE. Write (starsingnaltemp1, 79 );

When the red statement OUTFILE <Endl; is not written, the output results are as follows:

Input file:

1234 5678

1256 7890

1122

Output file: all data is placed on one row.

1234 million and 5678 million mouths ...... 1256 million or 7890 million mouths ...... 1122 ...... 0 1 0

When the red statement OUTFILE <Endl; is written, the input and output results are as follows:

Input file:

1234 5678

1256 7890

1122

Output file:

1234 5678

1256 7890

1122

0 1 0