$1.$ ALGORITHM TO FIND WHETHER GIVEN STRING IS IDENTIFIER OR NOT

Start

Declare ij$,$flag$-$I,len as int and str$\{10]$ as char

$3.$ Allow the user to enter the string

Initialize the loop $$ Oj$-1$ to islen

if str$$il is digit, assign flag O

else if stri$]$ is alphabet, increment flag

D$)$ if strfi$]$ is alphanum, increment flag

$2)$ else if stri$]$ is not digit, assign flag O

$3)$ else increment flag

d$.$ else if stri$]$ is not alphanum, assign flag$-0$

S$.$ if Mag$-$O$,$ print Identifier else print Not Identifier

Stop

$2.$ ALGORITHM TO FIND WHETHER GIVEN STRING IS CONSTANT OR NOT

$1.$ Start

$2.$ Declare i$,$ flag as int and a$(5]$ as char

$3.$ Allow user to enter the value

$4.$ Initialize the loop from i$-0$ to $$strien$($a$)$

a$.$ if ali$)$ is digit, assign flag$-$I

b$.$ else assign flag$-$O

S$.$ if flag$-=1,$ print Value is Constant else print Value is Variable

$6.$ Stop

Output

Enter the value :

$123$

Value is constant

Enter the value :

vikas

Value is a variable

$3.$ YOU NEED TO GENERATE A CALCULATOR PROGRAM USING BOTH LEX AND YACC.

The calculator should support Division, Multiplication, Addition, Subtraction, and power operation in proper

precedence and associativity. The calculator should also support first bracket with the expression