Compilare: main.cpp: In function 'mare unul()': main.cpp:38:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p >= s.size()) ~~^~~~~~~~~~~ main.cpp:45:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p >= s.size() || s[p] != ')') ~~^~~~~~~~~~~ main.cpp: In function 'mare inmul()': main.cpp:63:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p < s.size() && s[p] == '*') ~~^~~~~~~~~~ main.cpp:69:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p < s.size() && s[p] == '(') ~~^~~~~~~~~~ main.cpp: In function 'mare adun()': main.cpp:78:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p < s.size() && s[p] == '+') ~~^~~~~~~~~~ main.cpp:84:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p < s.size() && s[p] == '(') ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:99:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0, st = 0; i<s.size() && st >= 0; i++) ~^~~~~~~~~ main.cpp:107:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (st == 0 && i >= s.size()) ~~^~~~~~~~~~~