Question

用C#语言求1-2+3-4+……+m的值

Answer 1

int count = 0;
for (int i = 1; i <= m; i++)
{
if (i % 2 == 1)//余数为1
{
count += i;
}
else //余数为0
{
count -= i;
}
}

Answer 2

int
m
=
50;
int
count
=
0;
for
(int
i
=
1;
i
<=
m;
i++)
{
if
(i
%
2
==
1)
{
count
+=
i;
}
else
{
count
-=
i;
}
}

Answer 3

int m = 50;
int count = 0;
for (int i = 1; i <= m; i++)
{
if (i % 2 == 1)
{
count += i;
}
else
{
count -= i;
}
}