lexical analyzer

Question

lexical error is______

1.an error produced by LA when illegal character is appear

2.an error produced by LA when missing left parenthesis in expression

3.an error produced by scanner when both operator and parenthesis appeared consecutively

4.all of above

Comments

i)int a,1b; //here 'b' is illegal character so it is lexical error.

ii)int  a,b;

a=(b+c;   //no lexical error .

iii)a=b+( c  //no lexical error.no of tokens are 6.

Answer 1

(a) option is correct.