Why these problems happen?

[Aileen Wei]

Hi, when i'm compiling my codes, i meet these warnings:

lex.yy.c:1517: warning: `yyunput' defined but not used
calc3.y: In function `main':
calc3.y:324: warning: implicit declaration of function `yyparse'

I don't know the function of yyunput,and in my main function, i write:

int main(void){

yyparse(); //yyparse only appears here!

return 0;)

Thanks!

Aileen

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