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uses crt;
var n,i,dem,dem1:integer;
begin
clrscr;
write('nhap n='); readln(n);
dem:=0;
dem1:=0;
for i:=1 to n do
begin
if i mod 2=0 then inc(dem);
if i mod 2=1 then inc(dem1);
end;
writeln('so luong so chan trong day so tu 1 toi ',n,' la: ',dem);
writeln('so luong so le trong day so tu 1 toi ',n,' la: ',dem1);
readln;
end.
var n,i:longint;
begin
readln(n);
if n mod 2=0 then write('chan: ',n div 2,' le: ',n div 2) else
write('chan: ',n div 2,' le: ',n div 2+1) ;
end.
1: VCT pascal kiểm tra số n có phải là số nguyên tố không
uses crt;
var n,i,kt:integer;
begin
clrscr;
repeat
write('nhap n='); readln(n);
if n<=1 then writeln('ban da nhap sai,yeu cau ban nhap lai');
until n>1;
kt:=0;
for i:=2 to n-1 do
if n mod i=0 then
begin
kt:=1;
break;
end;
if kt=0 then writeln(n,' la so nguyen to')
else writeln(n,' khong la so nguyen to');
readln;
end.
2:VCT pascal kiểm tra số n có phải là số hoàn hảo không
uses crt;
var n,i,t:integer;
begin
clrscr;
write('nhap n:'); readln(n);
t:=0;
for i:=1 to n-1 do
if n mod i=0 then begin
t:=t+i;
end;
if t=n then writeln(n,' la so hoan hao')
else write(n,' khong la so hoan hao');
readln;
end.
3:VCT pascal kiểm tra số n xuất ra màn hình các số nguyên tố từ 2 đến n
uses crt;
var n,i,kt,j:integer;
begin
clrscr;
repeat
write('nhap n='); readln(n);
if n<=2 then writeln('ban da nhap sai, yeu cau ban nhap lai');
until n>2;
writeln('day cac so nguyen to trong khoang tu 2 toi ',n,' la:');
for i:=2 to n do
begin
kt:=0;
for j:=2 to i-1 do
if i mod j=0 then kt:=1;
if kt=0 then write(i:4);
end;
readln;
end.
var tam,a,b,i:integer;
begin
write('a = ');readln(a);
write('b = ');readln(b);
if a < b then
begin
tam:=a;
a:=b;
b:=tam;
end;
for i:=a to b do
if sqrt(i) = trunc(sqrt(i)) then write(i:10);
readln;
End.
program TinhTongVaUoc;
var
a, b, sum, i: integer;
uoc: boolean;
begin
write('Nhap so a: ');
readln(a);
write('Nhap so b: ');
readln(b);
// Tinh tong a+b
sum := a + b;
writeln('Tong cua a va b la: ', sum);
// In ra cac uoc cua tong
write('Cac uoc cua tong a+b la: ');
for i := 1 to sum do
begin
if sum mod i = 0 then
write(i, ' ');
end;
writeln;
// Kiem tra xem tong a+b co phai la so hoan hao hay khong
uoc := false;
for i := 1 to sum - 1 do
begin
if sum mod i = 0 then
uoc := true;
end;
if uoc and (sum = 2 * sum div 2) then
writeln('Tong a+b la so hoan hao')
else
writeln('Tong a+b khong phai la so hoan hao');
end.
program TinhTongVaUocSo;
var
a, b, tong, i: integer;
laSoNguyenTo: boolean;
begin
write('Nhap a: ');
readln(a);
write('Nhap b: ');
readln(b);
tong := a + b;
writeln('Tong cua a va b la: ', tong);
writeln('Uoc so cua tong la:');
for i := 1 to tong do
begin
if tong mod i = 0 then
writeln(i);
end;
laSoNguyenTo := true;
if tong < 2 then
laSoNguyenTo := false
else
for i := 2 to trunc(sqrt(tong)) do
if tong mod i = 0 then
begin
laSoNguyenTo := false;
break;
end;
if laSoNguyenTo then
writeln('Tong a va b la so nguyen to')
else
writeln('Tong a va b khong phai la so nguyen to');
readln;
end.
program TinhTongVaUocCuaTong;
var a, b, tong, i: integer;
SoNguyenTo: boolean;
begin
writeln('Nhap vao hai so a va b (a > 0, b > 0): ');
write('a = ');
readln(a);
write('b = ');
readln(b);
tong := a + b;
writeln('Tong cua a + b = ', tong);
writeln('Uoc cua tong a + b: ');
for i := 1 to tong do
begin
if tong mod i = 0 then
writeln(i);
end;
SoNguyenTo := true;
if tong < 2 then
SoNguyenTo := false
else
for i := 2 to trunc(sqrt(tong)) do
begin
if tong mod i = 0 then
begin
SoNguyenTo := false;
break;
end;
end;
if SoNguyenTo then
writeln('Tong a + b la so nguyen to:')
else
writeln('Tong a + b khong phai la so nguyen to:');
end.
Tham Khảo :
uses crt;
var a,b,i:integer;
begin
clrscr;
write('Nhap a='); readln(a);
write('Nhap b='); readln(b);
if a<b then
begin
for i:=1 to a do
if (a mod i=0) and (b mod i=0) then write(i:4);
end
else begin
for i:=1 to b do
if (a mod i=0) and (b mod i=0) then write(i:4);
end;
readln;
end.
1:
uses crt;
var n,t,i,j,kt:integer;
begin
clrscr;
write('nhap n='); readln(n);
if n>=2 then
begin
kt:=0;
for i:=2 to trunc(sqrt(n)) do
if n mod i=0 then kt:=1;
if kt=0 then writeln(n,' la so nguyen to')
else writeln(n,' khong la so nguyen to');
end
else writeln(n,' khong la so nguyen to');
writeln('cac so nguyen to trong khoang tu 2 toi ',n,' la: ');
t:=0;
for i:=2 to n do
begin
kt:=0;
for j:=2 to i-1 do
if i mod j=0 then kt:=1;
if kt=0 then
begin
write(i:4);
t:=t+i;
end;
end;
writeln;
writeln('tong cac so nguyen to trong khoang tu 2 toi ',n,' la: ',t);
readln;
end.
Program hotrotinhoc_hoc24;
var i,n: integer;
function nt(x: longint): boolean;
var j: longint;
begin
nt:=true;
if (x=2) or (x=3) then exit;
nt:=false;
if (x=1) or (x mod 2=0) or (x mod 3=0) then exit;
j:=5;
while (j<=trunc(sqrt(x))) do
begin
if (x mod j=0) or (x mod (j+2)=0) then exit;
j:=j+6;
end;
nt:=true;
end;
begin
write('Nhap n='); readln(n);
if nt(n) then writeln(N ,'la so nguyen to') else writeln(N,' khong phai so nguyen to');
write('Cac so nguyen to tu 0 den ',n,' la :');
i:=0;
while i<=n do
begin
i=sqr(trunc(sqrt(i))) then write(i,' ');
i:=i+1;
end;
writeln;
write('Cac so nguyen to tu 2 den ',n,' la :');
i:=2;
while i<=n do
begin
if nt(i) then write(i,' ');
i:=i+1;
end;
readln
end.
uses crt;
var a,d:array[1..100]of integer;
i,n,dem:integer;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
dem:=0;
for i:=1 to n do
if a[i]>0 then
begin
inc(dem);
b[dem]:=a[i];
end;
writeln('So duong cuoi cung trong mang la: ',b[dem]);
readln;
end.