Hello.exe is not running in my system

[VenkatesanSoundirarajan]

I have a warning, while executing "gcc lex.yy.c y.tab.c
-o hello.exe"

D:\LocalData\Downloads\hellex-master\hellex-master>gcc lex.yy.c y.tab.c -o hello.exe
hello.l: In function 'main':
hello.l:19:6: warning: implicit declaration of function 'yyparse' [-Wimplicit-fu
nction-declaration]
yyparse();
^
and hello.exe is not running in my system.

FYI: Already I have mingw5.3 version is available with my PC and even I have installed DEV-C++.

Please help me.

[nar3n12]

Sorry for the late late reply.
after you typed hello.exe, the curser would be blinking, right? if so then you are doing right. type hi
it will print hello world as output, (i.e) hi is the input here...