cách 1: While do
Program Hotboy ;
Uses crt;
Var i,s : longint;
Begin
S:=1;
Write('nhap n'); readln(n);
While i <= n do
Begin
i:= i+1 ; S:= S*i;
End;
Writeln('tich tu 1 den n la',s);
Readln
End.
Cách 2: For to do
Program Hotboy ;
Uses crt;
Var i,s : longint;
Begin
S:=1;
Write('nhap n'); readln(n);
For i:=1 to n do
S:=S*i;
Writeln('tich tu 1 den n la',s);
Readln
End.
Tính tổng n số chẵn
Program Hotboy ;
Uses crt;
Var i,s : longint;
Begin
S:=0;
Write('nhap n'); readln(n);
For i:=1 to n do
If i mod 2= 0 then S:=S+i;
Writeln('tong chan tu 1 den n la',s);
Readln
End.
