scan_gl_nc

synopsis: INT scan_gl_nc(OP gl,nc)

description:

here we interactivly ask for a character of the group specified by the grouplabel. The routine outputs the label of the class, and reads the value on the class.

example:

 ....
 scan(INTEGER,a);
 m_gl_alt(a,b);
 scan_gl_nc(b,c);
 reduce_nc(c,d); println(d);
 ....

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