How to open a file in c

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#include<stdio.h>

int main(){

    FILE *ptr; //It is file pointer

   

    //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 status and printing message

    if(ptr == NULL)

         printf("Error in opening the file");

    else

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

    return 0;

}

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