CODEWITHSUNDEEP
cflex-lexereoflex
AlVa
AlVa

Reputation: 11

Why premature eof on this flex program?

I am making a program in flex that takes a user's input in the form of a string that describes a shape. Now my code seems correct, but I get a premature eof on compilation.

I have also tried doing what similar questions have as answers, but still nothing.

%{
int flag = 0; 
}%
%%
"point" + [A-H]|"line" + [A-H]{2}|"triangle" + [A-H]{3}|"square" + [A-H]{4}|"pentagon" + [A-H] {5}|"hexagon" + [A-H]{6}|"heptagon" + [A-H]{7}|"octagon" + [A-H]{8}
flag=1; 
%%
main(){
    yylex();
    if (flag == 1){ 
        printf("Accepted");
    }else{
        printf("Not accepted");
    }
}

Upvotes: 1

Views: 911

Answers (1)

sepp2k
sepp2k

Reputation: 370465

Your %{ is unclosed because you wrote }% instead of %}. So flex thinks the }% and everything after it is supposed to be part of the C code and is still waiting for a closing %} when it reached the end of the file.

Upvotes: 3

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