Compilare: main.cpp: In function 'bool numar(int)': main.cpp:10:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(c[st]>='0' && c[st]<='9') ^~ main.cpp:12:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' return 0; ^~~~~~ main.cpp: In function 'int nr(int&)': main.cpp:20:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(numar(st+1) && st<=strlen(c)) ~~^~~~~~~~~~~ main.cpp: In function 'int prod(int, int&)': main.cpp:32:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( (((numar(st)) || (c[st]=='(')) && st<=strlen(c)) && (c[st-1]=='*' || c[st-1]=='/')) ~~^~~~~~~~~~~