C program, open the txt file

Answer 1

In the C language, to open a txtfile, you could use the fopen() function. This function has two parameters. The first is the file name (including the path), and the second is the mode to open the file. For example, the following example code:

```c
#include
int main() {
FILE *file;
char filename[] = "example.txt";
//Open the file read-only
file = fopen(filename, "r");
//Check if the file is opened successfully
if (file == NULL) {
print ("Unable to open the file %s_n", username);
return 1;
}
//Start the file operation here
//Close the file after the operation is completed
fclose(file);
return 0;
}
```

In the above code, the file name is specified as "example.txt." and the mode is "r", which means that the file is opened in read-only mode. If the file is successfully opened, the fopen() function will return a pointer to the FILE structure. If the file is not opened, it will return a pointer to the file structure. It should be noted that after the file operation is over, you need to use the fclose() function to close the file.
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