public int returnSum(int n)
{
int sum = 0;
for (int i = 1; i <= n; i++){int k = i;if (i % 2 == 0){k = -k;}sum = sum + k;}return sum;}public int returnSum1(int n){int k = n;if (n == 0){return 0;}if (n % 2 == 0){k = -k;}return aaa(n – 1) + k;}
public int returnSum(int n)
{
int sum = 0;
for (int i = 1; i <= n; i++){int k = i;if (i % 2 == 0){k = -k;}sum = sum + k;}return sum;}public int returnSum1(int n){int k = n;if (n == 0){return 0;}if (n % 2 == 0){k = -k;}return aaa(n – 1) + k;}
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