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The format i specified for the above result shows that i asked for one decimal point and 1 character long for the width. I can see the one decimal point (i.e. .4) but why did the specified width not work?
What you specify is the minimum no. of characters to print. Here the integral part contains 4 characters and along with the fractional part, there are 6 characters to print. Increase the width to 7 to see the difference.