Compilare: main.cpp: In function 'int nr(int&)': main.cpp:11:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while('0'<=c[st+1] && c[st+1]<='9' && st+1<=strlen(c)) ~~~~^~~~~~~~~~~ main.cpp: In function 'int prod(int&, int)': main.cpp:21:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(c[st]=='*'||c[st]=='/' && st+1<=strlen(c)) ~~~~^~~~~~~~~~~ main.cpp:21:34: warning: suggest parentheses around '&&' within '||' [-Wparentheses] while(c[st]=='*'||c[st]=='/' && st+1<=strlen(c)) ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int evaluare(int)': main.cpp:44:13: warning: unused variable 's' [-Wunused-variable] int s=0; ^ main.cpp:50:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^