Compilare: user.cpp: In function ‘int main()’: user.cpp:60:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(ok==0) ^ user.cpp:9:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d\n",&t); ^ user.cpp:11:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s\n",s); ^