Compilare: main.cpp: In function 'int op(int)': main.cpp:20:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l=0;l<strlen(text);l++) ~^~~~~~~~~~~~~ main.cpp:44:13: warning: this 'else' clause does not guard... [-Wmisleading-indentation] else fp[++k]=-1; p--;} ^~~~ main.cpp:44:32: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else' else fp[++k]=-1; p--;} ^ main.cpp: In function 'int eval(char)': main.cpp:13:1: warning: control reaches end of non-void function [-Wreturn-type] } ^