Compilare: main.c: In function 'main': main.c:42:18: warning: format '%d' expects argument of type 'int', but argument 3 has type 'long long unsigned int' [-Wformat=] fprintf(sf,"%d", rez); ^ main.c:8:9: warning: variable 'ok' set but not used [-Wunused-but-set-variable] int ok = 1; ^~ main.c:13:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(pf,"%c",&s); ^~~~~~~~~~~~~~~~~~