"C + +" Fill function, the difference between fill and memset function

• memset function
  • Fill a character by byte
  • Inside the header file. <cstring>
• Fill function
  • Assigns the element of an interval to the same value according to the unit assignment value
  • Inside the header file. <algorithm>
• Because the Memset function is populated by bytes, the general memset can only be used to populate the char array (since only char is a byte) if the int array is filled, except for 0 and-1, the others cannot. Because only 00000000 = 0,-1 Similarly, if we fill each bit with "1", it will result in filling into "11111111"
• The fill function can be assigned any value, and the method of use is particularly simple:
  • Fill (arr, arr + N, content to be filled in);
  • For example:

  • #include <cstdio><algorithm>usingnamespace  std; int Main () {    int arr[];     Ten 2 );     return 0 ;}

  • Vectors can also:

  • #include <algorithm>#include<vector>#include<iostream>using namespacestd;intmain () {vector<int> v{0,1,2,3,4,5,6,7,8,9}; Fill (V.begin (), V.end (),-1); return 0;}

  • The way to use memset is:

  • #include <iostream><cstring>usingnamespace  std; int Main () {    int a[];     0 sizeof a);     return 0 ;}

"C + +" Fill function, the difference between fill and memset function