gtkcalc.p example has syntax errors

[namazso]

gtkcalc.p(8) : error 010: invalid function or declaration
gtkcalc.p(20) : error 001: expected token: "]", but found "char"
gtkcalc.p(26) : error 001: expected token: "]", but found "char"
gtkcalc.p(26) : error 017: undefined symbol "char"
gtkcalc.p(26) : error 029: invalid expression, assumed zero
gtkcalc.p(26) : fatal error 107: too many error messages on one line

i tried fixing it for a pr but couldnt quite figure it out