C :

#include<stdio.h>
main()
{
	int i;
	int sum = 0;
	for(i = 0;i< 100;i++)
	{
		if(i%2 != 0)
			sum+=i;
	}
	printf("%d",sum);
} 

Pascal :

  program ex5_5;
  begin
  writeln(2500);
  end.