a = int(input("请输入起始数："))
b = int(input("请输入结束数："))
if a > b:
c = b
b = a
a = c
count = 0
for i in range(a, b+1):
count = count+i
i = i+1
if i > b+1:
break
print("%s到%s的累加和:%d"%(a,b,count))
a = int(input("请输入起始数："))
b = int(input("请输入结束数："))
if a > b:
c = b
b = a
a = c
count = 0
for i in range(a, b+1):
count = count+i
i = i+1
if i > b+1:
break
print("%s到%s的累加和:%d"%(a,b,count))
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