#include

int main() {

FILE *file_pointer;

// Open a file for writing

file_pointer = fopen("output.txt"

"w");

// Write 1000 characters to the file

for (int i = 0; i < 1000; i++) {

fputc('a'

file_pointer);

}

// Close the file

fclose(file_pointer);

printf("Successfully wrote 1000 characters to the file.");

return 0;

}

In this code snippet

we first open a file called output.txt for writing using the fopen function. We then use a loop to write 1000 characters (in this case

the character 'a') to the file using the fputc function. Finally

we close the file using fclose and print a message to confirm that the characters were successfully written.