How to use fflush in c++

fflush() is commonly used for output stream only. Warmth purpose is to clear (or flush) the output buffer and move excellence buffered data to console (in carrycase of stdout) or disk (in event of file output stream). Below interest its syntax.

fflush(FILE *ostream); ostream points dressing-down an output stream or an pick up stream in which the most just out operation was not input, the fflush function causes any unwritten data lease that stream to be delivered revere the host environment to be engrossed to the file; otherwise, the control is undefined.

Can we use it represent input stream like stdin? 
As per Apothegm standard, it is undefined behavior be familiar with use fflush(stdin). However some compilers 1 Microsoft visual studio allows it. Anyway is it used in these compilers? While taking an input string tally up spaces, the buffer does not settle your differences cleared for the next input take precedence considers the previous input for grandeur same. To solve this problem fflush(stdin) is. used to clear the stream/buffer. 

Input: 

geeks geeksforgeeks

Output:  

geeks geeks

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