How can I check if given int exists in array

Question

For example  I have this array   int myArray       3  6  8  33      How to check if given variable x is in it   Do I have to write my own function and loop the array  or is there in modern c   equivalent to in array in PHP

User · Accepted Answer

You can use std  find for this    include  lt algorithm gt     for std  find  include  lt iterator gt     for std  begin  std  end  int main         int a      3  6  8  33     int x   8    bool exists   std  find std  begin a   std  end a   x     std  end a       std  find returns an iterator to the first occurrence of x  or an iterator to one-past the end of the range if x is not found

User · Answer

int index   std  distance std  begin myArray   std  find begin myArray   end std  myArray   VALUE      Returns an invalid index  length of the array  if not found

User · Answer

I think you are looking for std  any of  which will return a true false answer to detect if an element is in a container  array  vector  deque  etc    int val   SOME VALUE     this is the value you are searching for bool exists   std  any of std  begin myArray   std  end myArray     amp   int i        return i    val        If you want to know where the element is  std  find will return an iterator to the first element matching whatever criteria you provide  or a predicate you give it    int val   SOME VALUE  int  pVal   std  find std  begin myArray   std  end myArray   val   if  pVal    std  end myArray            not found   else          found

User · Answer

You do need to loop through it  C   does not implement any simpler way to do this when you are dealing with primitive type arrays   also see this answer  C   check if element exists in array

User · Answer

Try this   include  lt iostream gt   include  lt algorithm gt    int main        int myArray       3  6  8  33      int x   8     if  std  any of std  begin myArray   std  end myArray       int n  return n    x               std  cout  lt  lt   found match    lt  lt  std  endl         return 0

User · Answer

You almost never have to write your own loops in C     Here  you can use std  find   const int toFind   42  int  found   std  find  myArray  std  end  myArray   toFind   if  found    std  end  myArray       std  cout  lt  lt   Found  n    else     std  cout  lt  lt   Not found  n       std  end requires C  11   Without it  you can find the number of elements in the array with   const size t numElements   sizeof  myArray    sizeof  myArray 0         and the end with   int  end   myArray   numElements

[c++] How can I check if given int exists in array?

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