File Read in C | File Handling | How to Read File

Today we learn about a topic of file handling that how to read the file.

Lets get Started...

#include<stdio.h>
#include<stdlib.h>

int main(){
    char ch;
    FILE *f_pointer;
    f_pointer = fopen("./example.txt", "r");

    if(f_pointer == NULL){
        perror("Error Occurs!!");
        exit(EXIT_FAILURE);
    }
    printf("Content of the File : \n");
    
    ch = fgetc(f_pointer);
    while (ch != EOF)
    {
        printf("%c", ch);  // printing one by one characters from the file
        ch = fgetc(f_pointer);
    }

    fclose(f_pointer);
    return 0;
    

}

'ch' variable store the latest seek pointer where read the file.
f_pointer is a file pointer.
using the file f_open() function open the file. f_open() function take two arguments first argument is filename of file and second argument mode in which mode open the file.
check condition if (f_pointer == NULL) -> perror("Error Occur") and perror() function also print the error that means whats error occur. and the exit to the program otherwise.
print content of the file.
ch == fgetc(f_pointer), ch hold the seek pointer where read the file.
And while ch != EOF
EOF -> End of the File
when ch is not reach to the end of the file then read the content and printing one by one character.
At last close the file using fclose() function.