1-1/2+1/3-.....-1/10

你没说是什么编程语言，不过看语法应该是vb的
showtomorrow写的似乎是c语言，不过忘了声明变量类型
ZHRX写的肯定不对啊，for怎么能跟end if连用，而且while后边漏了括号
应该是
Dim i As Integer
Dim result As Double
i = 1
result = 0
Do While (i <= 10)
result = result + 1 / i * (-1) ^ (i + 1)
i = i + 1
Loop

Dim i As Integer
Dim result As Double
result = 0
For i = 1 To 10
result = result + 1 / i * (-1) ^ (i + 1)
Next i

Dim i As Integer
Dim result As Double
i = 1
result = 0
Do Until (i > 10)
result = result + 1 / i * (-1) ^ (i + 1)
i = i + 1
Loop
这三种方法结果即是result，输出即可

你问的题不太明白？？

i=1,n=1,s=0;
do{
s=s+i/n;
i=-i;
n=n+1;
}while(n<=10)
刚学，只会大致的思想，不会具体的编写。

for t=1 to 10
x=x+(-1)^(t+1)*1/t
end if

do while t<=10
t=t+1
x=x+(-1)^(t+1)*1/t
loop