Write C program to open an existing file“My.TXT” and read its content and displayit.

Sure! Here is a step-by-step guide to writing a C program that opens an existing file "My.TXT", reads its content, and displays it:

1. Include the necessary header files:

#include <stdio.h>

2. Declare the main function:

int main() {
    // Code goes here
    return 0;
}

3. Declare a file pointer variable to hold the reference to the file:

FILE *file;

4. Open the file using the fopen function:

file = fopen("My.TXT", "r");

Note: The second argument "r" specifies that the file is opened in read mode.

5. Check if the file was opened successfully:

if (file == NULL) {
    printf("Failed to open the file.\n");
    return 1;
}

6. Read the content of the file using a loop:

char ch;
while ((ch = fgetc(file)) != EOF) {
    printf("%c", ch);
}

7. Close the file using the fclose function:

fclose(file);

8. Complete the main function and the program:

int main() {
    FILE *file;
    file = fopen("My.TXT", "r");
    if (file == NULL) {
        printf("Failed to open the file.\n");
        return 1;
    }
    char ch;
    while ((ch = fgetc(file)) != EOF) {
        printf("%c", ch);
    }
    fclose(file);
    return 0;
}

That's it! This program will open the file "My.TXT", read its content, and display it on the console.