Made-easy-test-series

Question

This program will give lexical error or not?

Int main()

{

Int a = 09;

/* Hello world */

}

In the solution it is written that this program will give lexical error because integer has been assigned an invalid octal. Is this problem comes under lexical error?

Comments

shweta sah yepp it will show error any day 

AS OCTAL HAS 0 -7 NUMBERS ONLY and ur trying to represent 9 : )

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@Deepanshu , But it should not be a LEXICAL ERROR. "09" is a valid lexeme and it should be identified as a constant token. 

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Soumya29 plzz tell your approach why ??? it is constant 

from my view it will see o , then it will know it is octal  then it will try to find that next no. is octal or not ......

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@Deepanshu You reasoning seems correct. RegEx is sufficient to detect to. It should be lexical error only. :(
Two more things-
1. What about "Int" (Capital I) in the above code. It will be detected an "identifier" i think instead of "keyword"
 2.

void main() 
{ 
  int a, b, c; 
  a + b = c; 
}
Which error ?
Syntax or Semantic ?

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Yes i think 'I' will be detected as an identifier

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i think syntax error

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@shweta  sah  yes .. 
@Deepanshu .. I too think so. Grammar will not generate it. But It is given semantic error here- https://www.geeksforgeeks.org/errors-in-cc/ (point 5th)
 

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Soumya29 : (      no comment,, in my notes i    write it as synatx   error when  two or more operators there...... everything of notes is  going wrong direction today

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Soumya29 now see here https://wci.llnl.gov/codes/basis/manual/node53.html

in this we are right 

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@Deepanshu , a+b = c; is a semantic error.
https://stackoverflow.com/questions/53828655/in-c-programming-l-value-required-is-a-semantic-error-or-syntax-error/53828780#53828780

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@Deepanshu : i have some points to find out semantic errors:

1)using a variable without declaration

2)re declaration of same variable with same scope.

3)expression stat.. which aren,t type compatible

4)mismatch of formal and actual parameter

and we can have two kind of semantic errors:

1)compile time

2)run time..