#include “iostream” unsigned long left(unsigned long num, unsigned ct); char *left(const char *str, int n = 1); int main() { using namespace std; char const *trip = “Hawaii!!”; unsigned long n = 12345678; int i; char *temp; for(int i=1;i<10;i++) { cout << left(n, i) << endl; temp = left(trip, i); cout << temp << endl; delete [] temp; } cin.get(); cin.get(); 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++; //digits = 8 if(digits >ct) { ct = digits - ct; //ct = 7; 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; }
