Compilare: main.cpp: In function 'int expresie(int&)': main.cpp:19:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p<s.size() and (s[p]=='-' or s[p]=='+')) ~^~~~~~~~~ main.cpp: In function 'int termen(int&)': main.cpp:32:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p<s.size() and (s[p]=='*' or s[p]=='/')) ~^~~~~~~~~ main.cpp: In function 'int numar(int&)': main.cpp:61:13: warning: unused variable 'ok' [-Wunused-variable] int ok=1; ^~ main.cpp:63:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p<s.size() and s[p]>='0' and s[p]<='9') ~^~~~~~~~~