Compilare: main.cpp: In function 'int exp()': main.cpp:32:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < fin.size() && fin[pos] == '|') ~~~~^~~~~~~~~~~~ main.cpp: In function 'int t1()': main.cpp:45:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < fin.size() && fin[pos] == '&') ~~~~^~~~~~~~~~~~ main.cpp: In function 'int t2()': main.cpp:58:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < fin.size() && fin[pos] == '!') ~~~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:110:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sir.size(); i++) ~~^~~~~~~~~~~~ main.cpp:120:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (i < sir.size() - 1 && sir[i] == 'O' && sir[i + 1] == 'R') ~~^~~~~~~~~~~~~~~~ main.cpp:125:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (i < sir.size() - 2 && sir[i] == 'N' && sir[i + 1] == 'O' && sir[i + 2] == 'T') ~~^~~~~~~~~~~~~~~~ main.cpp:130:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (i < sir.size() - 2 && sir[i] == 'A' && sir[i + 1] == 'N' && sir[i + 2] == 'D') ~~^~~~~~~~~~~~~~~~ main.cpp:135:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (i < sir.size() - 3 && sir[i] == 'T' && sir[i + 1] == 'R' && sir[i + 2] == 'U' && sir[i + 3] == 'E') ~~^~~~~~~~~~~~~~~~ main.cpp:140:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (i < sir.size() - 4 && sir[i] == 'F' && sir[i + 1] == 'A' && sir[i + 2] == 'L' && sir[i + 3] == 'S' && sir[i + 4] == 'E') ~~^~~~~~~~~~~~~~~~