pascalscript - Convert Boolean to String with Inno Setup -

what easiest way convert boolean value string in inno setup pascal script? trivial task should implicit seems require full-blown if/else construction.

function isdowngradeuninstall: boolean; begin     result := iscommandlineparamset('downgrade');     msgbox('isdowngradeuninstall = ' + result, mbinformation, mb_ok); end; 

this doesn't work because "type mismatch". inttostr doesn't accept boolean neither. booltostr not exist.

if need once only, easiest inline solution cast boolean integer , use inttostr function. 1 true , 0 false.

msgbox('isdowngradeuninstall = ' + inttostr(integer(result)), mbinformation, mb_ok); 

though, use format function same result:

msgbox(format('isdowngradeuninstall = %d', [result]), mbinformation, mb_ok); 

(contrary delphi) inno setup/pascal script format implicitly converts boolean integer %d.

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if need more fancy conversion, or if need conversion often, implement own function, @roben shows in answer.

function booltostr(value: boolean): string;  begin   if value     result := 'yes'   else     result := 'no'; end;