Lex Program to count number of words, lines, letters, and digits

digit[0-9]
letter[a-zA-Z]
end[;]
space[' ']
line[\n]

%{
int dig_cnt=0,let_cnt=0, wrds_cnt=0,line_cnt=0,spec_cnt=0;
%}

%%
{digit} {dig_cnt++;}
{letter} {let_cnt++;}
{space}* {wrds_cnt++;}
{line} {line_cnt++;}
{end} {printf("digits = %d, letters = %d, words = %d, lines = %d, special characters = %d",dig_cnt,let_cnt,wrds_cnt+1,line_cnt,spec_cnt);}
. {spec_cnt++;}
%%

int main(void)
{
yylex();
}

Output:

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