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a problem about mathematica output

• To: mathgroup at smc.vnet.net
• Subject: [mg82379] a problem about mathematica output
• From: qwer <chendy0524 at gmail.com>
• Date: Fri, 19 Oct 2007 04:51:26 -0400 (EDT)

I have a puzzle when using mathematica, I want to out put my resuts to
a .dat file ,but I do not know how to control the digital,  for
example:

the mathematica code is

f[x_]:=NIntegrate[Sin[y]/y,{y,0,x}];
OpenWrite["xx.dat",FormatType->TextForm];
Do[Write["xx.dat",N[x,4],"   ",N[f[x],4]],{x,0.001,1,0.05}];
Close["xx.dat"];

then in xx.dat you can find
0   0.
0.05   0.0499931
0.1   0.0999445
0.15   0.149813
0.2   0.199556
0.25   0.249134