leftover.cpp

// leftover.cpp -- overloading the left() function
#include <iostream>
unsigned long left(unsigned long num, unsigned ct);
char * left(const char*str, int n=1);
int main(){
  using namespace std;
  const char * trip="Hawaii!!";
  unsigned long n=12345678;
  int i=0;
  char * temp;
  for(i=1; i<10; i++){
    cout<<left(n,i)<<endl;
    temp=left(trip,i);
    cout<<temp<<endl;
    delete [] temp;
  }
  return 0;
}
unsigned long left(unsigned long num, unsigned ct){
  unsigned digits=1;
  unsigned long n=num;
  if(ct==0 || num == 0){
    return 0;
  }
  while(n/=10)
    digits++;
  if(digits>ct){
    ct=digits-ct;
    while(ct--){
      num/=10;
    }
    return num;
  }else{
    return num;
  }
}
char * left(const char* str, int n){
  if(n<0){
    n=0;
  }
  char *p=new char[n+1];
  int i=0;
  for(i=0;i<n&&str[i]; i++){
    p[i]=str[i];
  }
  while(i<=n){
    p[i++]='\0';
  }
  return p;
}