#include<iostream>  #include<stdio.h>  #include<string>  using namespace std;  int substr(char *str,unsigned start, unsigned len)  {      string temp;      for(unsigned curr=start;curr<start+len;curr++){          char tmp=str[curr];          temp+=tmp;      }      cout<<temp<<endl;     return 0;  }  int main(){      char *test="wewesdsfadfdss";      substr(test,3,3);      return 0;  }