Eroare de compilare: user.cpp: In function ‘void paranteza(int)’: user.cpp:19:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<strlen(s)) ^ user.cpp:21:37: error: ‘semn’ was not declared in this scope if(s[i]=='(') ++i,paranteza(semn); ^ user.cpp:22:23: error: ‘semn’ was not declared in this scope else p[s[i]]+=semn; ^ user.cpp:25:23: error: ‘semn’ was not declared in this scope if(s[i]=='/') semn=-semn_init; ^ user.cpp:26:14: error: ‘semn’ was not declared in this scope else semn=semn_init; ^