1)
program ct;
uses crt;
var i,n:integer;
S:longint;
begin clrscr;
writeln('Nhap so n: '); readln(n);
S:=0;
for i:=1 to n do
S:=S+i;
writeln('Tong S la: ',S);
readln;
end.
2)
program ct;
uses crt;
var i,n:integer;
S:longint;
begin clrscr;
S:=0;
for i:=1 to 200 do
S:=S+i;
writeln('Tong 200 so nguyen dau tien la: ',S);
readln;
end.
3)
program ct;
uses crt;
var i,n:integer;
T:longint;
begin clrscr;
T:=1;
for i:=1 to 30 do
T:=T*i;
writeln('Tich 30 so tu nhien dau tien la: ',S);
readln;
end.
4)
program ct;
uses crt;
var i,n:integer;
gt:longint;
begin clrscr;
gt:=1;
for i:=1 to n do
gt:=gt*i;
writeln('n!= ',gt);
readln;
end.
Học tốt!