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+====== sleep ======
+<code c>
+void sleep( int );
+</code>
+===== description of sleep =====
+delay programm for given number of seconds\\
+<code c>
+#include<stdio.h>
+#include<dos.h>
+int main( void )
+{
+   printf("Wait or better sleep for 42 seconds to continue.\n");
+   sleep(42);
+   printf("Programm execution continued after 42 seconds");
+   return 0;
+}
+</code>
+==== output of sleep c example ====
+    Wait or better sleep for 42 seconds to continue
+    .... 42 seconds later
+    Programm execution continued after 42 seconds

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