Count The Number of Occurrences of a Particular Word or Letter - Lex Program - Compiler Design

Program:

%{
    int icount=0,factcount=0;
%}

%%

fact    factcount++;
i         icount++;
(.|\n)    ;

%%
main()
{
    yylex();
    printf("Count of \"fact\"= %d \nCount of letter 'i' = %d\n",factcount,icount);  
    return 0;
}

Output:


nn@linuxmint ~ $ lex l4.l
nn@linuxmint ~ $ gcc lex.yy.c -ll
nn@linuxmint ~ $ ./a.out<c1.c
Count of "fact"= 5
Count of letter 'i' = 17
nn@linuxmint ~ $


// Input file: c1.c
#include<stdio.h>
main ()
{
    int i,n,fact=1;
    printf("Enter the number: ");
    scanf("%d",&n);            //inputing the number
    for(i=1;i<=n;i++)        /* finding factorial */
    {
        fact = fact*i;
    }
    printf("Factorial=%d\n",fact);

}