program to get sum of 1+1,1+2,1+3,1+4,1+5,.... to nth term.

//program to get sum of 1+1,1+2,1+3,1+4,1+5,....           to nth term.
#include<stdio.h>

#include<conio.h>

void main()
{
   float i,n,k=1,sum=0;

      printf("enter  positive number for 'n'\n");
  scanf("%f",&n);

  for(i=1;i<=n;i++)
    {               

          sum=sum+(k+i);
        }

  printf("the sum=%f",sum);

getch();
}
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logics in mind:
->enter a number for range for which you want to get sum, say 'n'.

->let a variable sum=0 with initial value '0'

->we get sum using formula sum=sum+k+i because in terms 1+1,1+2,1+3,1+4,1+5,....        ,the first value is same 

 and second value is changing so for first, k is working and for second, 'i' is working

->at last we display final sum.