Sum of positive nos

C program to read hundred integers and find the sum of only positive integers and skip negative integer

#include<stdio.h>
int main()
{
      int a[100],i,sum=0;
      for(i=0;i<=99;i++)
{
      if(a[i]>0)
         sum=sum+i;
     
}

printf("sum of positive integers=%d",sum);
return 0;

}