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09162008, 07:15 AM #1
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Question regarding sumation of floating point numbers
Hi there,
I have a question about coding with single precision floating point numbers (i.e, float)...how can I sum a certain number of floating pt #s within an interval...let's say I want to add a 100 numbers, starting from 1 within the interval [1,2) ?
Anybody knows how can this be done?
Any info would be greatly appreciated!
09282008, 04:17 AM
#2
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 Aug 2008
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So you essentially want 1 + .01 + .02 + .03 + .. + .99? or up to + 1.99? Sounds like whatever you're trying to do it needs a for loop. I thought of something like this (included output). The while loop may not be necessary. Hope this helps you. Done in C++ by the way.
Code:float i; float j; float total = 1.0; j = total; while (j <= 2) { for (i = 0.0; i < 100; i++) { cout << "i is: " << i << endl; cout << "total is " << total << endl << "added to i/100 is " << i/100 << endl; total = total + i/100; } cout << total << endl; j = total; }Code:total is 1.00 added to i/100 is 0.01 i is: 2.00 total is 1.01 added to i/100 is 0.02 i is: 3.00 total is 1.03 added to i/100 is 0.03 i is: 4.00 total is 1.06 added to i/100 is 0.04 i is: 5.00 total is 1.10 added to i/100 is 0.05 i is: 6.00 total is 1.15 added to i/100 is 0.06 i is: 7.00 total is 1.21 added to i/100 is 0.07 i is: 8.00 total is 1.28 added to i/100 is 0.08 i is: 9.00 total is 1.36 added to i/100 is 0.09 i is: 10.00 total is 1.45 added to i/100 is 0.10 i is: 11.00 total is 1.55 added to i/100 is 0.11 i is: 12.00 total is 1.66 added to i/100 is 0.12 i is: 13.00 total is 1.78 added to i/100 is 0.13 i is: 14.00 total is 1.91 added to i/100 is 0.14 i is: 15.00 total is 2.05 added to i/100 is 0.15 i is: 16.00 total is 2.20 added to i/100 is 0.16 i is: 17.00 total is 2.36 added to i/100 is 0.17 i is: 18.00 total is 2.53 added to i/100 is 0.18 i is: 19.00 total is 2.71 added to i/100 is 0.19 i is: 20.00 total is 2.90 added to i/100 is 0.20 i is: 21.00 total is 3.10 added to i/100 is 0.21 i is: 22.00 total is 3.31 added to i/100 is 0.22 i is: 23.00 total is 3.53 added to i/100 is 0.23 i is: 24.00 total is 3.76 added to i/100 is 0.24 i is: 25.00 total is 4.00 added to i/100 is 0.25 i is: 26.00 total is 4.25 added to i/100 is 0.26 i is: 27.00 total is 4.51 added to i/100 is 0.27 i is: 28.00 total is 4.78 added to i/100 is 0.28 i is: 29.00 total is 5.06 added to i/100 is 0.29 i is: 30.00 total is 5.35 added to i/100 is 0.30 i is: 31.00 total is 5.65 added to i/100 is 0.31 i is: 32.00 total is 5.96 added to i/100 is 0.32 i is: 33.00 total is 6.28 added to i/100 is 0.33 i is: 34.00 total is 6.61 added to i/100 is 0.34 i is: 35.00 total is 6.95 added to i/100 is 0.35 i is: 36.00 total is 7.30 added to i/100 is 0.36 i is: 37.00 total is 7.66 added to i/100 is 0.37 i is: 38.00 total is 8.03 added to i/100 is 0.38 i is: 39.00 total is 8.41 added to i/100 is 0.39 i is: 40.00 total is 8.80 added to i/100 is 0.40 i is: 41.00 total is 9.20 added to i/100 is 0.41 i is: 42.00 total is 9.61 added to i/100 is 0.42 i is: 43.00 total is 10.03 added to i/100 is 0.43 i is: 44.00 total is 10.46 added to i/100 is 0.44 i is: 45.00 total is 10.90 added to i/100 is 0.45 i is: 46.00 total is 11.35 added to i/100 is 0.46 i is: 47.00 total is 11.81 added to i/100 is 0.47 i is: 48.00 total is 12.28 added to i/100 is 0.48 i is: 49.00 total is 12.76 added to i/100 is 0.49 i is: 50.00 total is 13.25 added to i/100 is 0.50 i is: 51.00 total is 13.75 added to i/100 is 0.51 i is: 52.00 total is 14.26 added to i/100 is 0.52 i is: 53.00 total is 14.78 added to i/100 is 0.53 i is: 54.00 total is 15.31 added to i/100 is 0.54 i is: 55.00 total is 15.85 added to i/100 is 0.55 i is: 56.00 total is 16.40 added to i/100 is 0.56 i is: 57.00 total is 16.96 added to i/100 is 0.57 i is: 58.00 total is 17.53 added to i/100 is 0.58 i is: 59.00 total is 18.11 added to i/100 is 0.59 i is: 60.00 total is 18.70 added to i/100 is 0.60 i is: 61.00 total is 19.30 added to i/100 is 0.61 i is: 62.00 total is 19.91 added to i/100 is 0.62 i is: 63.00 total is 20.53 added to i/100 is 0.63 i is: 64.00 total is 21.16 added to i/100 is 0.64 i is: 65.00 total is 21.80 added to i/100 is 0.65 i is: 66.00 total is 22.45 added to i/100 is 0.66 i is: 67.00 total is 23.11 added to i/100 is 0.67 i is: 68.00 total is 23.78 added to i/100 is 0.68 i is: 69.00 total is 24.46 added to i/100 is 0.69 i is: 70.00 total is 25.15 added to i/100 is 0.70 i is: 71.00 total is 25.85 added to i/100 is 0.71 i is: 72.00 total is 26.56 added to i/100 is 0.72 i is: 73.00 total is 27.28 added to i/100 is 0.73 i is: 74.00 total is 28.01 added to i/100 is 0.74 i is: 75.00 total is 28.75 added to i/100 is 0.75 i is: 76.00 total is 29.50 added to i/100 is 0.76 i is: 77.00 total is 30.26 added to i/100 is 0.77 i is: 78.00 total is 31.03 added to i/100 is 0.78 i is: 79.00 total is 31.81 added to i/100 is 0.79 i is: 80.00 total is 32.60 added to i/100 is 0.80 i is: 81.00 total is 33.40 added to i/100 is 0.81 i is: 82.00 total is 34.21 added to i/100 is 0.82 i is: 83.00 total is 35.03 added to i/100 is 0.83 i is: 84.00 total is 35.86 added to i/100 is 0.84 i is: 85.00 total is 36.70 added to i/100 is 0.85 i is: 86.00 total is 37.55 added to i/100 is 0.86 i is: 87.00 total is 38.41 added to i/100 is 0.87 i is: 88.00 total is 39.28 added to i/100 is 0.88 i is: 89.00 total is 40.16 added to i/100 is 0.89 i is: 90.00 total is 41.05 added to i/100 is 0.90 i is: 91.00 total is 41.95 added to i/100 is 0.91 i is: 92.00 total is 42.86 added to i/100 is 0.92 i is: 93.00 total is 43.78 added to i/100 is 0.93 i is: 94.00 total is 44.71 added to i/100 is 0.94 i is: 95.00 total is 45.65 added to i/100 is 0.95 i is: 96.00 total is 46.60 added to i/100 is 0.96 i is: 97.00 total is 47.56 added to i/100 is 0.97 i is: 98.00 total is 48.53 added to i/100 is 0.98 i is: 99.00 total is 49.51 added to i/100 is 0.99 final total 50.50