uses crt;
const n=5; m=4;
var a:array[1..n,1..m]of integer;
i,j:integer;
begin
clrscr;
randomize;
writeln('Исходная матрица');
for i:=1 to n do
begin
for j:=1 to m do
begin
a[i,j]:=random(100);
write(a[i,j]:3);
end;
writeln;
end;
writeln('Преобразованная матрица');
for i:=1 to n do
begin
for j:=1 to m do if (i mod 2=0) and (j mod 2=1) then a[i,j]:=0;
write(a[i,j]:3);
writeln;
end;
readln;
end.
Следующий вариант
uses crt;
const n=4;
m=5;
var a:array[1..n,1..m] of integer;
i,j:integer;
begin
ClrScr;
Randomize;
for i:=1 to n do
begin
for j:=1 to m do
begin
a[i,j]:=random(20)-10;
Write(a[i,j]:4);
end;
Writeln;
end;
Writeln;
for i:=1 to n do
begin
for j:=1 to m do
begin
if (i mod 2=0) or (j mod 2=0) then
a[i,j]:=0;
Write(a[i,j]:4);
end;
Writeln;
end;
Readln;
end.