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+{{keywords>wiki library source code example reference}}
+===== fflush =====
+<code c>
+    int fflush(FILE *stream);
+</code>
+Flushes stream stream and returns zero on success or EOF on error. Effect undefined for input stream. fflush(NULL) flushes all output streams.
+===== C Sourcecode Example =====
+<code c>
+/*
+ * fflush example code
+ * http://code-reference.com/c/stdio.h/fflush
+ */
+#include <stdio.h> /* including standard library */
+//#include <windows.h> /* uncomment this for Windows */
+#define MAX 80
+int main( void )
+{
+  FILE *filestream = fopen("test.txt", "rt+");
+  char buffer[MAX];
+  if (filestream)
+  {
+    fputs("write this in a file", filestream);
+    fflush(filestream); /* uncomment this function to see what's happend */
+    fgets(buffer, MAX, filestream);
+    puts(buffer);
+    fclose(filestream);
+  }
+  return 0;
+}
+</code>
+=== test.txt ===
+file test.txt
+<code c>
+Line 1
+#Line2
+Line 3
+#Line 4
+Line
+</code>
+==== fflush output ====
+    output: ./fflush
+test.txt after running the programm
+<code c>
+write this in a file
+#Line 4
+Line 5
+</code>

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