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From Angel, 3 Years ago, written in Pascal.
This paste is a reply to Untitled from sancat - go back
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program eje10;
uses crt;

 function valido(d,m,a:integer):boolean;

 begin
crt;
 
           function valido(d,m,a:integer):boolean;
 
begin
        
if (m>0) and (m<13) then
           begin
         
then
        begin
        
case (m) of
                1,3,5,8,10,12: if (d>0) and (d<=31) then
                                           valido:=True
                               else
                               valido:=False;
                               
                2:        
                valido:=True
        else
        valido:=False;
                               
                2:      
                
if (a mod 4=0) and (a mod 100<>0) then
                begin
                                                        if (d>0) and (d<=29) then
                                valido:=True
                        else
                                valido:=False;
                        end
                
                else
                begin
 
                if (a mod 4=0) and (a mod 100=0) then
                        if (d>0) and (d<=28) then
                                valido:= true
                        else
                                valido:= false;
                        
                if(a mod 4<>0) and (a mod 100<>0) then
                
                        if (d>0) and (d<=28) then
                                valido:= true
                        else
                                valido:= false;
                        
                        end;
               
                                4,6,7,9,11:
                                if (d>0) and (d<=30) 
then
                                        valido:=True
                                                                        else
                                        valido:=False;
                end
                 else
                 begin

                        if (a mod 4=0) and (a mod 100=0) then
                                if (d>0) and (d<=28) then
                                        valido:= true
                                else 
                         valido:= false;
                                else
                                valido:=false;
                                end;
                end;
                
                4,6,7,9,11: 
                 if (d>0) and (d<=30) then
                valido:=True
                 else
                 valido:=False;
        else 
                valido:=false;
        end; 
 end;
 
end;
var
d,m,a:integer;
begin
        writeln ('ingrese un dia');
dia');
        
readln (d);

(d);
        
writeln ('ingrese un mes');
mes');
        
readln (m);

(m);
        
writeln ('ingrese un ano');
ano');
        
readln (a);

(a);
        
writeln ('la fecha es: ',valido(d,m,a));


end.
',valido(d,m,a));
end.