# 求1-2+3-4+5.....99的所有數的和(含等式)

s = ""

sum = 0

start = 1

while start < 100:

temp = start % 2

if temp == 1:

if start == 1:

s = str(start)

else:

s = s + "+" + str(start)

sum = sum + start

else:

s = s + "-" + str(start)

sum = sum - start

start += 1

print(s)

print(start)

# 求1-2+3-4+5.....99的所有數的和(不含等式)

sum = 0

start = 1

while start < 100:

temp = start % 2

if temp == 1:

sum = sum + start

else:

sum = sum - start

start += 1

print(sum)

print(start)

1 #求1-2+3-4+5.....99的所有數的和(含等式)

2 s = ""

3

4 sum =05 start = 1

6

7 while start < 100:8 temp = start % 2

9 if temp == 1:10 if start == 1:11 s =str(start)12 else:13 s = s + "+" +str(start)14 sum = sum +start15 else:16 s = s + "-" +str(start)17 sum = sum -start18 start += 1

19

20 print(s)21 print(start)22

23

24

25 #求1-2+3-4+5.....99的所有數的和(不含等式)

26 sum =027 start = 1

28

29 while start < 100:30 temp = start % 2

31 if temp == 1:32 sum = sum +start33 else:34 sum = sum -start35 start += 1

36

37 print(sum)38 print(start)

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