Question one hundred and ten: sequence summation

[Plain] Description
 
 
Search for Series 1 2 4 7 11 16 22 ...... The sum of the First n.
 
 
Input
 
 
There are multiple groups of input data, each of which occupies one row.
 
The input data is an integer of n, 0 <n <1000.
 
 
Output
 
 
Each group outputs a row and each row has an integer, that is, the sum of the First n of the series.
 
 
Sample Input
 
 
3
4
 
 
Sample Output
 
 
7
14

Description

Search for Series 1 2 4 7 11 16 22 ...... The sum of the First n.

Input

There are multiple groups of input data, each of which occupies one row.

The input data is an integer of n, 0 <n <1000.

Output

Each group outputs a row and each row has an integer, that is, the sum of the First n of the series.

Sample Input

3
4

Sample Output

7
14
 

[Plain] # include <stdio. h>
 
Int main ()
{
Int I;
Int num;
Int sum;
Int array [1001];
 
While (scanf ("% d", & num )! = EOF & (num> 0 & num <1000 ))
{
Sum = 0;
Array [0] = 1;
For (I = 1; I <num; I ++)
{
Array [I] = array [I-1] + I;
}
 
For (I = 0; I <num; I ++)
{
Sum + = array [I];
}
Printf ("% d \ n", sum );
}

Return 0;
}

# Include <stdio. h>

Int main ()
{
Int I;
Int num;
Int sum;
Int array [1001];

While (scanf ("% d", & num )! = EOF & (num> 0 & num <1000 ))
{
Sum = 0;
Array [0] = 1;
For (I = 1; I <num; I ++)
{
Array [I] = array [I-1] + I;
}

For (I = 0; I <num; I ++)
{
Sum + = array [I];
}
Printf ("% d \ n", sum );
}
 
Return 0;
}