How to open a file in c

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

    return 0;

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