- Sử dụng For .. do :

uses crt;

var i, S : integer;

begin

clrscr;

S := 0;

for i := 1 to 50 do S := S + i;

write('Tong S = ', S);

readln

end.

- Sử dụng While .. do :

uses crt;

var i, S : integer;

begin

clrscr;

S := 0; i := 1;

while i <= 50 do

    begin

        S := S + i;

        i := i + 1;

    end;

write('Tong S = ', S);

readln

end.

Python:

print('S =',sum([i for i in range (1,51)]))

C++:

#include <iostream>
using namespace std;
int main(){
    long s=0;
    for (int i=1; i<=50; i++) s=s+i;
    cout << "S=" << s;
}

$\color{green}{\text{Cần code C#, JavaScript, Java thì nói để mình thêm}}$

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