stack overflow - process is terminated due to StackOverflowException from bool function C++ -

i trying make bool function allow input of string , input of substring searched in string's input. bool function should search recursively match, return true if there match inside of string. example: 'word' entered string, 'or' substring looking inside string. function should return true since 'or' inside 'word'. when run code, on command line say, "process terminated due stackoverflowexception" confused error means , how relates code.

#include <iostream> #include <string>  using namespace std;  bool find(string s, string t) {  if(s.length() <= 1){     return false; } int t_len = t.length() - 1; string se = s.substr(0, t_len);  if(se == t){     return true; } else s.erase(0,0); return find(s, t); } int main() {  string s; string t; cout << "enter string s: " << endl; cin >> s; cout << "enter string t: " << endl; cin >> t;  bool is_found = find(s, t); if(is_found = true) {     cout << "found: " << t << " in " << s << endl; }  system("pause"); return 0;   } 

your call erase not deleting characters. definition of erase is:

erase( size_type index = 0, size_type count = npos ); 

so want erase 1 character, not 0 characters.

additionally, test @ end should read:

if(is_found == true) 

as otherwise, you're trying assign is_found value true , test value (which true in case.

additionally, have:

string se = s.substr(0, t_len); 

where t_len incorrect (off one), string comparison not work.

fundamentally, looks you've not understood definitions of erase or substr, essential getting work properly.