How to open a C program with a text document

Text documents can only be opened. cpp and .h files, other formats will appear garbled when opened.

Right-click on the file, select Open Method, and select the notebook

The C programming language is very powerful, and it is possible to open the corresponding text by opening the function of the text (the parameters in it indicate the location and file name of the text to be opened).

First, the header file included:

file *file = fopen("c:\\","r");The file name represents the C drive, the file name is r, and the second parameter indicates the opening mode"a"Indicates that the append mode is opened"r"Indicates that it is opened in read mode"w"Indicates that the data is opened in writing mode, and thirdly, the data is read into the text file

Method: char s[10] =

while (!feof(file))

fread(s,1,1,file);

Read and write open files through the fread function, which is how to change the contents of the file.

<><3. Click to open the project below the title, as shown in the following figure.

4. The software will automatically help you find the file you made, click on the file you need to open.

5. You can see the file open, and you can view it, or modify it and add programs.

To open a file in C, you need to call the fopen function.

1. Function name: fopen

II. Header Documents:

3. Function Declaration:

file * fopen(const char * path,const char * mode);

4. Function parameters:

The path string contains the path and name of the file to be opened, which can be relative or absolute.

The mode string represents the flow pattern. Common forms of mode are as follows:

r opens the file in read-only mode, which must exist.

r+ opens the file in read-write mode, and the file must exist.

RB+ Read Write opens a binary file that allows reading and writing data, and the file must exist.

w Open a write-only file, if the file exists, the file length will be cleared to 0, that is, the file content will disappear. If the file does not exist, create the file.

w+ opens a readable and writable file, and if the file exists, the file length is cleared to zero, that is, the file content disappears. If the file does not exist, create the file.

a Open a write-only file in an append-of-the-box manner. If the file does not exist, the file will be created, and if the file exists, the data written will be added to the end of the file, that is, the original content of the file will be retained. (EOF character reserved).

A+ opens a read-write file in an additional manner. If the file does not exist, the file will be created, and if the file exists, the data written will be added to the end of the file, that is, the original content of the file will be retained. (The original EOF symbol is not retained).

wb only writes, opens, or creates a new binary; Only data is allowed to be written.

WB+ read-write opens or establishes a binary file that allows both reads and writes.

ab+ read-write opens a binary file, allowing data to be read or appended to the end of the file.

5. Return value:

If the operation is successful, a non-empty file* pointer is returned, which is used for subsequent operations on the file, such as read, write, and close.

If this fails, null is returned.

Open the file with the open function and then use read

Beginners just need to master:

file *fin, *fout;

Open as an ASCII file.

fin = fopen("name_","r");Used to read fout = fopen("name_","w");Used to write out as a binary file.

fin = fopen("name_","rb");Used to read fout = fopen("name_","wb");Used to write.