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+{{keywords>wiki library source code example reference}}
+====== isalnum ======
+<code cpp>
+    int isalnum(int chr);
+</code>
+check if a character Alphanumeric
+===== cpp Sourcecode Example =====
+<code cpp>
+#include <iostream> /* including standard library */
+#include <string>
+#include <cctype>
+using namespace std;
+int main ()
+{
+  int i;
+  string str="Test -!&%1";
+  for (i=0; i <= 11;i++)
+    {
+     if ( isalnum(str[i]) != 0 )
+      {
+       cout << "Character " << i << " is alphanumeric" << endl;
+      }
+    }
+  return 0;
+}
+</code>
+==== output ====
+    Character 0 is alphanumeric
+    Character 1 is alphanumeric
+    Character 2 is alphanumeric
+    Character 3 is alphanumeric
+    Character 9 is alphanumeric

on the occasion of the current invasion of Russia in Ukraine