How to read a file in c

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#include<stdio.h>

int main(){

    FILE *ptr; //It is file pointer

    char c;

    //opening the file in read mode in Linux os

     ptr = fopen("/root/Test/abc.c","r");

    //Opening the file in read mode in window os

    // ptr = fopen("C:\\Test\\abc.c","r");

    //Checking the path or file is valid or not and printing message

    if(ptr == NULL)

         printf("Error in opening the file");

    else

         printf("File has opened successfully in read mode");

   

    //Reading the each characters from file and printing it.

    do{

         c = getc(ptr);   //getting one character from file.

         printf("%c",c);  //printing the one character in console window

    }

    while(c != EOF);  //loop will terminate when end of file will reach.

   

    //closing the opened file

    fclose(ptr);                                                         

    return 0;

}

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