C + + Quiz code

1 /*2 returns the first n bits of the string and the first n bits of the returned integer3 */4 5#include <iostream>6 7UnsignedLongLeft (unsignedLongNumintn);8 Char* Left (Char* STR,intn);9 Ten using namespacestd; One  A intMain () - { -UnsignedLongnum; the     intN; -cout <<"Please enter an integer:"; -CIN >>num; -cout <<"Please enter the number of digits to intercept:"; +CIN >>N; -cout <<"before"<< N <<"bit is"<< left (num, n) <<Endl; +  A     Char* str =New Char( -); atcout <<"Please enter a string:"; -CIN >>str; -cout <<"Please enter the number of digits to intercept:"; -CIN >>N; -cout <<"before"<< N <<"bit is"<< left (str, n) <<Endl; -  in     //delete[] str; -  toCin.Get(); +Cin.Get(); - } the  *  $UnsignedLongLeft (unsignedLongNumintN)Panax Notoginseng { -UnsignedLongLen =1;//indicates that there are several theUnsignedLongTemp_num =num; +      while(Temp_num/=Ten) A     { thelen++; +     } -UnsignedLongCut_num_len = Len-(unsignedLong(n) >= Len? len:unsignedLong(n));//when n is less than the length of an integer, the original integer is retrieved directly $      while(cut_num_len--) $     { -Num/=Ten; -     } the     returnnum; - }Wuyi  the Char* Left (Char* STR,intN) - { Wu     intLen =strlen (str); -n = n >= len?len:n; About     Char* Temp_char =New Char(n +1); $  -      for(inti =0; I < n; i++) { -* (Temp_char + i) = * (str +i); -     } ATemp_char[n] =' /'; +     returnTemp_char; the}

Everybody look down, there's a problem when I cancel //delete[] str; Note, the program will error, not to encourage if it is a new self-made pointer is the best to delete it? Ask the right answer.

C + + Quiz code