Compilare: user.cpp:37:14: warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix] if(s[i]>='a'and s[i]<='z'or s[i]>='0' and s[i]<='9') ^ user.cpp:37:27: warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix] if(s[i]>='a'and s[i]<='z'or s[i]>='0' and s[i]<='9') ^ user.cpp: In function ‘int main()’: user.cpp:37:17: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(s[i]>='a'and s[i]<='z'or s[i]>='0' and s[i]<='9') ^ user.cpp:42:11: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s[loc]=NULL; ^