Compilare: user.cpp: In function ‘int main()’: user.cpp:2:134: warning: suggest parentheses around assignment used as truth value [-Wparentheses] int x,p,s[1<<22];std::string a,b="strmatch.";int main(){std::ifstream f(b+"in");std::ofstream g(b+"out");f>>a>>b;while(p=b.find(a,p)+1)s[x++]=p-1;g<<x;while(p<x&p<1000)g<<' '<<s[p++];} ^ user.cpp:2:159: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] int x,p,s[1<<22];std::string a,b="strmatch.";int main(){std::ifstream f(b+"in");std::ofstream g(b+"out");f>>a>>b;while(p=b.find(a,p)+1)s[x++]=p-1;g<<x;while(p<x&p<1000)g<<' '<<s[p++];} ^