Compilare: main.c: In function 'main': main.c:16:22: warning: format '%d' expects argument of type 'int', but argument 3 has type 'long int' [-Wformat=] fprintf(fptr1, "%d", num + num1); ^ main.c:13:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fptr,"%ld", &num); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:14:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fptr,"%ld", &num1); ^~~~~~~~~~~~~~~~~~~~~~~~~