C++ program-help printing columns and rows

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    C++ Columns Printing
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SUMMARY

The discussion focuses on a C++ program designed to print the approximation of e^x for values from 1 to 100 in a structured format of 20 rows and 5 columns. The provided code snippet demonstrates the use of loops and the cmath library for calculating the exponential function. Users reported issues with formatting, resulting in misaligned columns and trailing zeros in the output. The solution requires adjustments to the loop structure and formatting of the output to achieve a clean presentation.

PREREQUISITES
  • C++ programming fundamentals
  • Understanding of loops (for, while)
  • Basic knowledge of the cmath library
  • Familiarity with output formatting in C++
NEXT STEPS
  • Refine C++ output formatting using iomanip for better alignment
  • Explore the use of arrays to store and manage calculated values
  • Learn about error handling in C++ to manage invalid input
  • Investigate performance optimization for large calculations in C++
USEFUL FOR

C++ developers, students working on programming assignments, and anyone interested in improving their skills in output formatting and mathematical computations in C++.

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C++ program--help printing columns and rows

Homework Statement


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.

Homework Equations


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

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

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: 
#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: 
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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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
 
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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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