cg/6bss.l at master · mohammedlutf/cg · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
%{

#include<stdio.h>
int count=0;

%}

op [\+\-\*\/\=]

nop[\,\;\””]

letter [a-zA-Z]

digitt [0-9]

id {letter}*|({letter}{digitt})+

notid ({digitt}{letter})+

%%

[\t\n]+

("int")|("float")|("char")|("case")|("default")|("if")|("for")|("printf")|("scanf")|("include") { printf("%s is a keyword\n", yytext); }

{id} {printf("%s is an identifier\n", yytext); count++;}

"+"|"-"|"*"|"/"|"=" {printf( "An operator: %s\n", yytext);}

{notid} {printf("%s is not an identifier\n", yytext);}

{nop} {;}


%%

int main()

{
FILE *fp;

char file[10];

printf("\nEnter the filename: ");
scanf("%s", file);
fp=fopen(file,"r");
yyin=fp;
yylex();
printf("Total identifiers are: %d\n", count);

return 0;

}

int yywrap()
{
	return 1;
}