Input Source

] > Input Source

8.6 Input Source

The tokens are scanned through a global input variable yyin
The default input is set to stdin.

flex io.l
gcc -o io lex.yy.c -ll
io io.data
io < io.data

%%
%%
int main( int argc, char *argv[] )
{
     if( argc > 1 )
     {
        yyin = fopen( argv[1], "r" );
     }
     else
     {
        yyin = stdin;
     }
     yylex();
     return 0;
}

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<..io.data ..>

A data
file.

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