C - fopen invalid file

When fopen fails, it returns NULL and sets errno to indicate the type of error.

Check the return value, and if it's NULL check errno. You can use functions like perror or strerror to display simple messages about those errors.

in your param list:

FILE pFile ;

then:

  pFile = fopen ("myfile.txt","r");

if (pFile == NULL)
printf("No Such File !! ");