Compilare: user.cpp: In function ‘int main()’: user.cpp:52:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<strlen(s); i++) ^ user.cpp:56:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(s) && s[i]>='0' && s[i]<='9') ^ user.cpp:89:54: warning: operation on ‘k’ may be undefined [-Wsequence-point] sc[--k]=operatie(sc[k],sc[k+1],fp[i]); ^ user.cpp:89:54: warning: operation on ‘k’ may be undefined [-Wsequence-point] user.cpp: In function ‘int val(char)’: user.cpp:21:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int semn(char)’: user.cpp:36:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘long long int operatie(int, int, int)’: user.cpp:46:1: warning: control reaches end of non-void function [-Wreturn-type] } ^