sum of (2+4+6...........98+100)

#include<stdio.h>
int main()
{
  int a,sum=0;
   for(a=1; a<=50; a++)
   {
     printf("%d", 2*a);
     sum=sum+(2*a);
   if(a<100)
   {
     printf(" + ");
   }
   }

  printf(" = %d", sum);

  return 0;
}