hello,i want to know that why do we use getchar() before while loop and and when to use it?? like this solution.I dont know when to use getchar().can anyone help??
getchar() just accepts a character.
for better understanding read these
http://www.cplusplus.com/reference/cstdio/getchar/
http://cprogrammingexpert.com/C/Tutorial/io_functions/getchar.aspx
http://rabbit.eng.miami.edu/class/een218/getchar.html
http://en.wikibooks.org/wiki/C_Programming/C_Reference/stdio.h/getchar
Getchar() is used to get ‘\n’ from stdin left after integer input. It is used when there is a string input next to an integer input.
You may read this thread for further explanation.
http://discuss.codechef.com/questions/59719/why-using-getchar-in-the-following-program?page=1#59722
Hope You understood… 
that was very much useful…thanks a lot and yes understood 
welcome…