Compilare: main.c: In function 'main': main.c:48:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fp ,"%lld" , &p); ^~~~~~~~~~~~~~~~~~~~~~~ main.c:52:5: warning: 'n' is used uninitialized in this function [-Wuninitialized] fprintf(fi , "%lld" , factorial(n , p)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~