Compilare: user.cpp: In function ‘int main()’: user.cpp:9: warning: format ‘%c’ expects type ‘char*’, but argument 3 has type ‘int’ user.cpp:10: warning: format ‘%c’ expects type ‘char*’, but argument 3 has type ‘int’ user.cpp:11: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:16: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:17: warning: format ‘%c’ expects type ‘char*’, but argument 3 has type ‘int’ user.cpp:9: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result