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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

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