Compilare: user.cpp: In function ‘int main()’: user.cpp:14:12: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(c>='a'&&c<='z'||c>='A'&&c<='Z') ^ user.cpp:11:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&c); ^ user.cpp:22:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&c); ^