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C++ program-help printing columns and rows

  1. Feb 28, 2008 #1

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    C++ program--help printing columns and rows

    1. The problem statement, all variables and given/known data
    Print the approx of e^x from 1 to 100. It might not fit on screen so for example print out in 10 columns and 10 rows.


    2. Relevant equations
    Code (Text):

            int row =1;
           while (row < 20)
           {
                int column = 1;

                while (column < 5)
                {
                 cout << endl;
                 column++;
                }
           row++;
           }
     

    3. The attempt at a solution

    I'm trying to print out 20 rows and 5 columns of the approx of e^x from 1 to 100. Right now I'm only concerned about the print out. Right now its an ugly mess. Everything seems shifted over and there is no uniform columns. Then at the end there is a mess of zeros. Here is the code
    Code (Text):

    #include <iostream>
    #include <cmath>
    using namespace std;

    int main()
    {
        double ex, realex, x, fact;

        cout << "Enter x:";
        cin >> x;
       
       
            int row = 1;

            while (row < 20)
            {
                int column = 1;

                while (column < 5)
                {
                    for (int n = 1; n < 100; n++)
                {
                    fact *= n;
                    ex = (pow(x, n))/fact;
                cout << ex << " ";
                       
                    }
                column++;
                cout << endl;
       
                }
        row++;
            }

        realex = exp(x);
        cout << "Function ex from cmath: " << realex << endl;

        return 0;
    }
     
    output:
    Code (Text):

    Enter x:2
    4.11584e+269 4.11584e+269 2.7439e+269 1.37195e+269 5.48779e+268 1.82926e+268 5.22647e+267 1.30662e+267 2.90359e+266 5.80719e+265 1.05585e+265 1.75975e+264 2.70731e+263 3.86759e+262 5.15679e+261 6.44598e+260 7.58351e+259 8.42612e+258 8.8696e+257 8.8696e+256 8.44724e+255 7.67931e+254 6.67766e+253 5.56472e+252 4.45177e+251 3.42444e+250 2.53662e+249 1.81187e+248 1.24957e+247 8.33045e+245 5.37449e+244 3.35905e+243 2.03579e+242 1.19752e+241 6.84299e+239 3.80166e+238 2.05495e+237 1.08155e+236 5.54643e+234 2.77322e+233 1.35279e+232 6.44185e+230 2.99621e+229 1.36191e+228 6.05295e+226 2.63172e+225 1.11988e+224 4.66616e+222 1.90456e+221 7.61822e+219 2.98754e+218 1.14905e+217 4.33605e+215 1.60594e+214 5.8398e+212 2.08564e+211 7.31804e+209 2.52346e+208 8.55411e+206 2.85137e+205 9.34876e+203 3.01573e+202 9.57374e+200 2.99179e+199 9.20552e+197 2.78955e+196 8.32702e+194 2.44912e+193 7.09891e+191 2.02826e+190 5.71341e+188 1.58706e+187 4.3481e+185 1.17516e+184 3.13377e+182 8.24676e+180 2.14201e+179 5.49235e+177 1.39047e+176 3.47617e+174 8.58313e+172 2.09345e+171 5.04445e+169 1.20106e+168 2.82602e+166 6.57214e+164 1.51084e+163 3.43372e+161 7.71623e+159 1.71472e+158 3.76861e+156 8.19263e+154 1.76186e+153 3.74863e+151 7.89185e+149 1.64414e+148 3.38997e+146 6.91831e+144 1.39764e+143
    4.41017e+113 4.41017e+113 2.94011e+113 1.47006e+113 5.88022e+112 1.96007e+112 5.60021e+111 1.40005e+111 3.11123e+110 6.22246e+109 1.13136e+109 1.88559e+108 2.90091e+107 4.14416e+106 5.52555e+105 6.90694e+104 8.12581e+103 9.02868e+102 9.50387e+101 9.50387e+100 9.0513e+99 8.22846e+98 7.15518e+97 5.96265e+96 4.77012e+95 3.66932e+94 2.71802e+93 1.94144e+92 1.33892e+91 8.92617e+89 5.75882e+88 3.59926e+87 2.18137e+86 1.28316e+85 7.33234e+83 4.07352e+82 2.2019e+81 1.1589e+80 5.94306e+78 2.97153e+77 1.44953e+76 6.90251e+74 3.21047e+73 1.4593e+72 6.48579e+70 2.81991e+69 1.19996e+68 4.99984e+66 2.04075e+65 8.163e+63 3.20118e+62 1.23122e+61 4.64612e+59 1.72079e+58 6.2574e+56 2.23479e+55 7.84136e+53 2.70392e+52 9.16582e+50 3.05527e+49 1.00173e+48 3.23138e+46 1.02584e+45 3.20574e+43 9.86381e+41 2.98903e+40 8.92249e+38 2.62426e+37 7.60655e+35 2.1733e+34 6.12197e+32 1.70055e+31 4.65904e+29 1.2592e+28 3.35786e+26 8.83648e+24 2.29519e+23 5.8851e+21 1.4899e+20 3.72475e+18 9.19691e+16 2.24315e+15 5.40518e+13 1.28695e+12 3.02811e+10 7.04212e+08 1.61888e+07 367927 8268.02 183.734 4.0381 0.0877849 0.00188785 4.0167e-05 8.4562e-07 1.76171e-08 3.63239e-10 7.41304e-12 1.49758e-13
    4.72554e-43 4.72554e-43 3.15036e-43 1.57518e-43 6.30072e-44 2.10024e-44 6.00069e-45 1.50017e-45 3.33371e-46 6.66743e-47 1.21226e-47 2.02043e-48 3.10836e-49 4.44051e-50 5.92068e-51 7.40085e-52 8.70689e-53 9.67432e-54 1.01835e-54 1.01835e-55 9.69857e-57 8.81688e-58 7.66685e-59 6.38904e-60 5.11123e-61 3.93172e-62 2.91238e-63 2.08027e-64 1.43467e-65 9.56448e-67 6.17063e-68 3.85664e-69 2.33736e-70 1.37492e-71 7.85667e-73 4.36482e-74 2.35936e-75 1.24177e-76 6.36805e-78 3.18402e-79 1.55318e-80 7.39611e-82 3.44005e-83 1.56366e-84 6.94959e-86 3.02156e-87 1.28577e-88 5.35738e-90 2.18669e-91 8.74674e-93 3.4301e-94 1.31927e-95 4.97837e-97 1.84384e-98 6.70487e-100 2.3946e-101 8.4021e-103 2.89727e-104 9.82127e-106 3.27376e-107 1.07336e-108 3.46246e-110 1.09919e-111 3.43498e-113 1.05692e-114 3.20278e-116 9.56054e-118 2.81192e-119 8.1505e-121 2.32871e-122 6.55976e-124 1.82215e-125 4.99221e-127 1.34924e-128 3.59799e-130 9.46838e-132 2.45932e-133 6.30595e-135 1.59644e-136 3.99111e-138 9.85459e-140 2.40356e-141 5.79171e-143 1.37898e-144 3.24465e-146 7.5457e-148 1.73464e-149 3.94237e-151 8.85927e-153 1.96873e-154 4.32687e-156 9.40624e-158 2.02285e-159 4.30393e-161 9.06091e-163 1.88769e-164 3.89214e-166 7.94315e-168 1.60468e-169
    5.06347e-199 5.06347e-199 3.37564e-199 1.68782e-199 6.75129e-200 2.25043e-200 6.4298e-201 1.60745e-201 3.57211e-202 7.14422e-203 1.29895e-203 2.16491e-204 3.33064e-205 4.75805e-206 6.34407e-207 7.93009e-208 9.32952e-209 1.03661e-209 1.09117e-210 1.09117e-211 1.03921e-212 9.44737e-214 8.21511e-215 6.84592e-216 5.47674e-217 4.21288e-218 3.12065e-219 2.22904e-220 1.53727e-221 1.02484e-222 6.61189e-224 4.13243e-225 2.50451e-226 1.47324e-227 8.41851e-229 4.67695e-230 2.52808e-231 1.33057e-232 6.82343e-234 3.41171e-235 1.66425e-236 7.925e-238 3.68605e-239 1.67548e-240 7.44656e-242 3.23764e-243 1.37772e-244 5.74049e-246 2.34306e-247 9.37223e-249 3.67538e-250 1.41361e-251 5.33437e-253 1.97569e-254 7.18434e-256 2.56584e-257 9.00293e-259 3.10446e-260 1.05236e-261 3.50786e-263 1.15012e-264 3.71006e-266 1.1778e-267 3.68062e-269 1.1325e-270 3.43181e-272 1.02442e-273 3.013e-275 8.73334e-277 2.49524e-278 7.02885e-280 1.95246e-281 5.3492e-283 1.44573e-284 3.85528e-286 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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    0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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    0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
    0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
    Function ex from cmath: 7.38906

     
     
  2. jcsd
  3. Mar 1, 2008 #2
    Problem: Right now I'm only concerned about the print out. Right now its an ugly mess.

    Solution: For neat output, you have to supply the formatting, the function sprintf() will be of some assistance. There are various ways to acomplish this formatting on the fly. The first method is to group your row data, then format all at the same time, whereas the other method, is to index the output string at fixed column intervals and insert the data, as you calculate it, at itz relevant column position. C also has formatting codes, for integer, string, floats and so on. Check it out, it will make your output look like a nice table, once you plan it correctly.

    happy computing (**).
     
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