Program in “C/Lex” to check whether Identifier is valid or not
#1

Objective
Program in “C/Lex” to check whether Identifier is valid or not

Code:
#include<stdio.h>
#include<conio.h>
void main()
{
clrscr();
int i=0,j=0,flag=1;
char ch,ip[100];
while((ch=getchar())!='\n')
{
ip[i]=ch;
i++;
}
ip[i]='*';
if((ip[j]>='a'&&ip[j]<='z')||(ip[j]>='A'&&ip[j]<='Z'))
{
j++;
while(ip[j]!='*')
{
if((ip[j]>='a'&&ip[j]<='z')||(ip[j]>='A'&&ip[j]<='Z')||(ip[j]>='0'&&ip[j]<='9')||ip[j]=='_')
            {
j++;
            }
            else
            {
                flag=0;
                goto loop;
            }
        }
    }
    else
    flag=0;
    loop:
    if(flag==0)
    printf("invalid");
    else
    printf("valid");
getch();
}
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