Compilare: user.cpp: In function ‘int main()’: user.cpp:52:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=strlen(a);i++)val[i]=M; ^ user.cpp:53:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp: In function ‘int valoare(int, char, int)’: user.cpp:30:1: warning: control reaches end of non-void function [-Wreturn-type] } ^