Объясните, что происходит в строчке s:=7+a+c1; Структура программы

Переменной s присваивается значение суммы(7 + а + с1), где a и c1 другие переменные.

program P1;
uses
crt;
var
A : array[1..3] of array [1..4] of longint;
i,j : integer;
begin

clrscr;

randomize;

writeln('Massiv : ');

for i := 1 to 3 do
begin

writeln('');

for j := 1 to 4 do
begin
A[i][j] := random(15)+random(5)-random(5);

write(A[i][j]:2,' ');
end;

 

end;

for i := 1 to 3 do
for j := 1 to 4 do
begin

if A[i][j] > 10 then
A[i][j] := i - j;

if (A[i][j] >= -5) and (A[i][j] <= 5) then
A[i][j] := sqr(i);

end;

writeln('');
writeln('');

writeln('Itogoviy massiv : ');

for i := 1 to 3 do
begin

writeln('');

for j := 1 to 4 do
begin

write(A[i][j]:2,' ');
end;

 

end;

 

readln;
readln;

end.

Fasm

 

org 100h

mov si, string
cld

my_loop:
lodsb
cmp al, 0
jz loop_exit
cmp al, '0'
jb my_loop
cmp al, '9'
ja my_loop
sub al, '0'
add bx, ax
jmp my_loop

loop_exit:
push -1
mov ax, bx
loop_push:
xor dx, dx
div [d]
push dx
cmp ax, 0
jne loop_push
mov ah, 2h

print:
pop dx
cmp dx, -1
je exit
add dl, '0'
int 21h
jmp print

exit:
mov ah, 01h
int 21h
ret

d dw 10
string db "1", 0

 

FPC

 

var
s : string;
i, c : integer;
begin
readln (s);
c := 0;
for i := 1 to length (s) do
if (s[i] in ['0'..'9']) then inc (c, ord (s[i]) - ord ('0'));
writeln (c);
end.