Compilare: user.cpp: In function ‘int main()’: user.cpp:16:19: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(c>='a' && c<='z' || c>='A' && c<='Z'){ ^ user.cpp:14:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%c", &c); ^