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write() { wyświetla na ekranie wartość przekazaną do funkcji jako argument w postaci łańcucha znakowego }
writeln() { wyświetla na ekranie wartość przekazaną do funkcji jako argument w postaci łańcucha znakowego i ustawia kursor w kolejnej linii }
read() { oczekuje na wpisanie z klawiatury znaków}
readln() { oczekuje na wpisanie z klawiatury znaków i ustawia kursor w kolejnej linii }
readln { funkcja bezwarunkowa, powoduje oczekiwanie na naciśnięcie klawisza Enter}
Typy danych
- Tryb wyliczeniowy
- Tryb okrojony - służy do ograniczenia zakresów wartości dowolnego ciągu znaków
- Typy całkowite
- SHORTINT: -128 .. 127. Zajmuje 1 bajt.
- BYTE: 0 .. 255. Zajmuje 1 bajt.
- INTEGER: -32768..32767. Zajmuje 2 bajty.
- WORD: 0 .. 65535. Zajmuje 2 bajty.
- LONGINT: -2 147 483 648 .. 2 147 483 647. Zajmuje 4 bajty.
- Typy rzeczywiste
- REAL:
do 
. Zajmuje 6 bajtów, mantysa 11 lub 12 - SINGLE:
do 
. Zajmuje 4 bajty, mantysa 7 lub 8 - DOUBLE:
do 
. Zajmuje 8 bajtów, mantysa 15 lub 16 - EXTENED:
do 
. Zajmuje 10 bajtów, mantysa 19 lub 20
- REAL:
- Typ logiczny
- BOOLEAN: true albo false
- Typ łańcuchowy
- STRING[byte rozmiar]. Brak wartości rozmiar powoduje przyjęcie domyślne wartości rozmiar:=255.
Zadanie 1. Wczytaj 2 liczby całkowite. Wypisz ich sumę, różnicę, iloczyn i iloraz.
program dzialania;
var a,b: real;
begin
write('Pierwsza liczba: ');
readln(a);
write('Druga liczba: ');
readln(b);
writeln(a:12:3,' + ',b:12:3,' = ',a+b:12:3);
writeln(a:12:3,' - ',b:12:3,' = ',a-b:12:3);
if (a<>0) and (b<>0) then
begin
writeln(a:12:3,' * ',b:12:3,' = ',a*b:12:3);
writeln(a:12:3,' / ',b:12:3,' = ',a/b:12:3);
end
else
begin
writeln('Nie można wykonać mnożenia i dzielenia.');
end;
readln;
end.
Zadanie 2. Zmodyfikuj.
program dzialania;
uses crt;
var
a,b: LongInt;
liczba: byte;
begin
write('Pierwsza liczba: ');
readln(a);
write('Druga liczba: ');
readln(b);
writeln('Wybierz dzialanie:');
writeln('1: dodawanie');
writeln('2: odejmowanie');
writeln('3: mnozenie');
writeln('4: dzielenie');
writeln('5: modulo');
read(liczba);
CASE liczba OF
1 : writeln(a,' + ',b,' = ',a+b);
2 : writeln(a,' - ',b,' = ',a-b);
3 : begin
if ((a<>0) and (b<>0)) then
writeln(a,' * ',b,' = ',a+b)
else
writeln('Nie mozna wykonac tej operacji.');
end;
4 : begin
if ((a<>0) and (b<>0)) then
writeln(a,' / ',b,' = ',a/b)
else
writeln('Nie mozna wykonac tej operacji.');
end;
5 : writeln(a,' % ',b,' = ',a mod b);
end;
delay(2000);
end.