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function jiecheng(n) y=1;sum=0; for i=1:n y=y*i sum=sum+y; end sum
>> jiecheng(20)
sum =
2.5613e+18
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>> format short,exp(1)
ans =
2.7183
>> format long,exp(1)
ans =
2
2.718281828459046
>> format short e,exp(1)
ans =
2.7183e+00
>> format long e,exp(1)
ans =
2.718281828459046e+00
>> format short g,exp(1)
ans =
2.7183
>> format long g,exp(1)
ans =
2.71828182845905
>> format rat,exp(1)
ans =
1457/536
>> format hex,exp(1)
ans =
4005bf0a8b14576a
>> format bank,exp(1)
ans =
2.72
3