title: writing into a file in c
body: <p>i have an <code>char</code> array <code>b[20]</code> which i want to write into a file  . After every iteration the value of <code>b[20]</code> changes , so i would like to write the string in each line of the file in each iteration . So how can i change a new line in a file and also put in a array of character?</p>