C :

#include<stdio.h>
int main()
{
	int i,s=0;
for(i=1;i<=100;i=i+2)
{
	s=s+i;
}
printf("%d\n",s);
return 0;
}

C++ :

#include <iostream>
using namespace std;
int main()
{
	int a=0;
	for(int i=1;i<=100;i+=2)
	a=a+i;
	cout<<a<<endl;
	return 0;
}

Pascal :

program aa;
var a,d,b,c,e,max,min:longint;
begin
 b:=1;
 c:=0;
 for a:=1 to 50 do
 begin
  b:=b+2;
  c:=c+b;
 end;
 e:=c-100;
 write(e);
end.