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+{{keywords>wiki library source code example reference}}
+===== iscntrl =====
+<code cpp>
+    int iscntrl(int chr);
+</code>
+Tests if a character a control character
+===== cpp Sourcecode Example =====
+<code cpp>
+#include <iostream> /* including standard library */
+#include <string>
+#include <cctype>
+using namespace std;
+int main ( void )
+{
+  int i;
+  string str="Test\n-!&%1";
+  for (i=0; i <= 11;i++)
+    {
+     if ( iscntrl(str[i]) != 0 )
+      {
+       cout << "Character " << i << " is a control char" << endl;
+      }
+    }
+  return 0;
+}
+</code>
+==== output ====
+    Character 4 is a control char
+    Character 10 is a control char
+    Character 11 is a control char

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