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- #include <iostream>
- unsigned long left(unsigned long num, unsigned ct);
- char * left(const char * str, int n = 1);
- int main()
- {
- using namespace std;
- char * trip = "Hawaii!!";
- unsigned long n = 12345678;
- int i;
- 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;
- for (i = 0; i < n && str[i]; i++)
- p[i] = str[i];
- while (i <= n)
- p[i++] = '\0';
- return p;
- }
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