将文本文件输出组织到列中
一切都像它应该的那样工作，除非我输出到文本文件，我无法弄清楚如何保持所有输出排队。我的老师不会帮助我，我实际上已经用“fixed，setprecision，left，setw（）等”进行了几个小时的试错。
//Project #5
//Start Date: November 17th
//Due Date: November 23rd
#include <iostream>
#include <string>
#include <fstream>
#include <cstdlib>
#include <cmath>
#include <iomanip>
using namespace std;
double f = 3.14159;
double upperBound = 0;
double lowerBound = 0;
double increment = 0;
double tempVal = 0;
double powVal = 0;
double expVal = 0;
double fact = 0;
double sinVal = 0;
double x = 0.0;
char userCont = 'Y';
int n = 0;
int i = 0;
//Factorial function using recursion...
double factorial(const int n) {
if (n <= 1) return 1;
fact = n * factorial(n - 1);
return fact;
}
//Power function using recursion...
double power(const double x, const int n) {
if (n <= 0)
return 1;
powVal = x * power(x, n - 1);
return powVal;
}
//my_sin function using power and factorial functions
double my_sin(const double x) {
sinVal = 0;
for (int k = 0; k < 50; k++) {
sinVal += power(-1, k) * (power(x, 2 * k + 1) / factorial(2 * k + 1));
}
return sinVal;
}
//my_exp(x) Function
double my_exp(const double x) {
expVal = 0;
for (int k = 0; k < 50; k++) {
expVal += power(x, k) / factorial(k);
}
return expVal;
}
int main() {
ofstream fout("output.text");
while (userCont == 'y' || userCont == 'Y') {
cout << "Enter lower and upper bounds: ";
cin >> upperBound >> lowerBound;
cout << "Enter Increment: ";
cin >> increment;
//Checking if upper and lower bounds are in the right order...
if (upperBound < lowerBound) {
tempVal = upperBound;
upperBound = lowerBound;
lowerBound = tempVal;
}
fout << "x sin(x) my_sin(x) e(x) " <<
"my_el(x) my_exp(x)" << endl;
//Loop to display and increase x by the incrememnt
for (x = lowerBound; x <= upperBound; x = x + increment) {
fout.precision(7);
fout << setw(8) << left << x << " ";
fout << setw(8) << my_sin(x) << setw(8) << " ";
fout << setw(8) << sin(x) << setw(8) << " ";
fout << setw(8) << exp(x) << setw(8) << " ";
fout << setw(8) << exp(x) << setw(8) << " ";
fout << my_exp(x) << endl;
}
cout << "Another (y/n)? ";
cin >> userCont;
}
return 0;
}
这是它应该如何看待
1 个答案:
答案 0 :(得分：2)
一些清理工作以及我能够模仿格式化的最佳方法，希望它能带来一些灵感/帮助。
重要请注意我如何移除所有全局变量。他们不好:(
<强> Live On Coliru
// Project #5
// Start Date: November 17th
// Due Date: November 23rd
#include <cmath>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <string>
using namespace std;
double factorial(const int n) {
if (n <= 1)
return 1;
return n * factorial(n - 1);
}
double power(const double x, const int n) {
if (n <= 0)
return 1;
return x * power(x, n - 1);
}
// my_sin function using power and factorial functions
double my_sin(const double x) {
double sinVal = 0;
for (int k = 0; k < 50; k++) {
sinVal += power(-1, k) * (power(x, 2 * k + 1) / factorial(2 * k + 1));
}
return sinVal;
}
// my_exp(x) Function
double my_exp(const double x) {
double expVal = 0;
for (int k = 0; k < 50; k++) {
expVal += power(x, k) / factorial(k);
}
return expVal;
}
int main() {
ofstream fout("output.text");
char userCont = 'Y';
while (userCont == 'y' || userCont == 'Y') {
cout << "Enter lower and upper bounds: ";
double upperBound, lowerBound;
cin >> upperBound >> lowerBound;
cout << "Enter Increment: ";
double increment = 0;
cin >> increment;
// Checking if upper and lower bounds are in the right order...
if (upperBound < lowerBound) {
std::swap(upperBound, lowerBound);
}
fout << " x sin(x) my_sin(x) e(x) my_el(x) my_exp(x)" << endl;
// Loop to display and increase x by the incrememnt
for (double x = lowerBound; x <= upperBound; x = x + increment) {
fout.precision(7);
fout << right << std::fixed << std::setprecision(7) << setw(12) << x << " ";
fout << right << std::fixed << std::setprecision(7) << setw(12) << my_sin(x) << setw(4) << " ";
fout << right << std::fixed << std::setprecision(7) << setw(12) << sin(x) << setw(4) << " ";
fout << right << std::fixed << std::setprecision(7) << setw(12) << exp(x) << setw(4) << " ";
fout << right << std::fixed << std::setprecision(7) << setw(12) << exp(x) << setw(4) << " ";
fout << my_exp(x) << endl;
}
cout << "Another (y/n)? ";
cin >> userCont;
}
}
输出：
x sin(x) my_sin(x) e(x) my_el(x) my_exp(x)
0.0000000 0.0000000 0.0000000 1.0000000 1.0000000 1.0000000
0.1000000 0.0998334 0.0998334 1.1051709 1.1051709 1.1051709
0.2000000 0.1986693 0.1986693 1.2214028 1.2214028 1.2214028
0.3000000 0.2955202 0.2955202 1.3498588 1.3498588 1.3498588
0.4000000 0.3894183 0.3894183 1.4918247 1.4918247 1.4918247
0.5000000 0.4794255 0.4794255 1.6487213 1.6487213 1.6487213
0.6000000 0.5646425 0.5646425 1.8221188 1.8221188 1.8221188
0.7000000 0.6442177 0.6442177 2.0137527 2.0137527 2.0137527
0.8000000 0.7173561 0.7173561 2.2255409 2.2255409 2.2255409
0.9000000 0.7833269 0.7833269 2.4596031 2.4596031 2.4596031
1.0000000 0.8414710 0.8414710 2.7182818 2.7182818 2.7182818
1.1000000 0.8912074 0.8912074 3.0041660 3.0041660 3.0041660
1.2000000 0.9320391 0.9320391 3.3201169 3.3201169 3.3201169
1.3000000 0.9635582 0.9635582 3.6692967 3.6692967 3.6692967
1.4000000 0.9854497 0.9854497 4.0552000 4.0552000 4.0552000
1.5000000 0.9974950 0.9974950 4.4816891 4.4816891 4.4816891
1.6000000 0.9995736 0.9995736 4.9530324 4.9530324 4.9530324
1.7000000 0.9916648 0.9916648 5.4739474 5.4739474 5.4739474
1.8000000 0.9738476 0.9738476 6.0496475 6.0496475 6.0496475
1.9000000 0.9463001 0.9463001 6.6858944 6.6858944 6.6858944
2.0000000 0.9092974 0.9092974 7.3890561 7.3890561 7.3890561
2.1000000 0.8632094 0.8632094 8.1661699 8.1661699 8.1661699
2.2000000 0.8084964 0.8084964 9.0250135 9.0250135 9.0250135
2.3000000 0.7457052 0.7457052 9.9741825 9.9741825 9.9741825
2.4000000 0.6754632 0.6754632 11.0231764 11.0231764 11.0231764
2.5000000 0.5984721 0.5984721 12.1824940 12.1824940 12.1824940
2.6000000 0.5155014 0.5155014 13.4637380 13.4637380 13.4637380
2.7000000 0.4273799 0.4273799 14.8797317 14.8797317 14.8797317
2.8000000 0.3349882 0.3349882 16.4446468 16.4446468 16.4446468
2.9000000 0.2392493 0.2392493 18.1741454 18.1741454 18.1741454
3.0000000 0.1411200 0.1411200 20.0855369 20.0855369 20.0855369
3.1000000 0.0415807 0.0415807 22.1979513 22.1979513 22.1979513
3.2000000 -0.0583741 -0.0583741 24.5325302 24.5325302 24.5325302
3.3000000 -0.1577457 -0.1577457 27.1126389 27.1126389 27.1126389
3.4000000 -0.2555411 -0.2555411 29.9641000 29.9641000 29.9641000
3.5000000 -0.3507832 -0.3507832 33.1154520 33.1154520 33.1154520
3.6000000 -0.4425204 -0.4425204 36.5982344 36.5982344 36.5982344
3.7000000 -0.5298361 -0.5298361 40.4473044 40.4473044 40.4473044
3.8000000 -0.6118579 -0.6118579 44.7011845 44.7011845 44.7011845
3.9000000 -0.6877662 -0.6877662 49.4024491 49.4024491 49.4024491
4.0000000 -0.7568025 -0.7568025 54.5981500 54.5981500 54.5981500
4.1000000 -0.8182771 -0.8182771 60.3402876 60.3402876 60.3402876
4.2000000 -0.8715758 -0.8715758 66.6863310 66.6863310 66.6863310
4.3000000 -0.9161659 -0.9161659 73.6997937 73.6997937 73.6997937
4.4000000 -0.9516021 -0.9516021 81.4508687 81.4508687 81.4508687
4.5000000 -0.9775301 -0.9775301 90.0171313 90.0171313 90.0171313
4.6000000 -0.9936910 -0.9936910 99.4843156 99.4843156 99.4843156
4.7000000 -0.9999233 -0.9999233 109.9471725 109.9471725 109.9471725
4.8000000 -0.9961646 -0.9961646 121.5104175 121.5104175 121.5104175
4.9000000 -0.9824526 -0.9824526 134.2897797 134.2897797 134.2897797
5.0000000 -0.9589243 -0.9589243 148.4131591 148.4131591 148.4131591
5.1000000 -0.9258147 -0.9258147 164.0219073 164.0219073 164.0219073
5.2000000 -0.8834547 -0.8834547 181.2722419 181.2722419 181.2722419
5.3000000 -0.8322674 -0.8322674 200.3368100 200.3368100 200.3368100
5.4000000 -0.7727645 -0.7727645 221.4064162 221.4064162 221.4064162
5.5000000 -0.7055403 -0.7055403 244.6919323 244.6919323 244.6919323
5.6000000 -0.6312666 -0.6312666 270.4264074 270.4264074 270.4264074
5.7000000 -0.5506855 -0.5506855 298.8674010 298.8674010 298.8674010
5.8000000 -0.4646022 -0.4646022 330.2995599 330.2995599 330.2995599
5.9000000 -0.3738767 -0.3738767 365.0374679 365.0374679 365.0374679
6.0000000 -0.2794155 -0.2794155 403.4287935 403.4287935 403.4287935
6.1000000 -0.1821625 -0.1821625 445.8577701 445.8577701 445.8577701
6.2000000 -0.0830894 -0.0830894 492.7490411 492.7490411 492.7490411
6.3000000 0.0168139 0.0168139 544.5719101 544.5719101 544.5719101
6.4000000 0.1165492 0.1165492 601.8450379 601.8450379 601.8450379
6.5000000 0.2151200 0.2151200 665.1416330 665.1416330 665.1416330
6.6000000 0.3115414 0.3115414 735.0951892 735.0951892 735.0951892
6.7000000 0.4048499 0.4048499 812.4058252 812.4058252 812.4058252
6.8000000 0.4941134 0.4941134 897.8472917 897.8472917 897.8472917
6.9000000 0.5784398 0.5784398 992.2747156 992.2747156 992.2747156
7.0000000 0.6569866 0.6569866 1096.6331584 1096.6331584 1096.6331584
7.1000000 0.7289690 0.7289690 1211.9670745 1211.9670745 1211.9670745
7.2000000 0.7936679 0.7936679 1339.4307644 1339.4307644 1339.4307644
7.3000000 0.8504366 0.8504366 1480.2999276 1480.2999276 1480.2999276
7.4000000 0.8987081 0.8987081 1635.9844300 1635.9844300 1635.9844300
7.5000000 0.9380000 0.9380000 1808.0424145 1808.0424145 1808.0424145
7.6000000 0.9679197 0.9679197 1998.1958951 1998.1958951 1998.1958951
7.7000000 0.9881682 0.9881682 2208.3479919 2208.3479919 2208.3479919
7.8000000 0.9985433 0.9985433 2440.6019776 2440.6019776 2440.6019776
7.9000000 0.9989413 0.9989413 2697.2823283 2697.2823283 2697.2823283
8.0000000 0.9893582 0.9893582 2980.9579870 2980.9579870 2980.9579870
8.1000000 0.9698898 0.9698898 3294.4680753 3294.4680753 3294.4680753
8.2000000 0.9407306 0.9407306 3640.9503073 3640.9503073 3640.9503073
8.3000000 0.9021718 0.9021718 4023.8723938 4023.8723938 4023.8723938
8.4000000 0.8545989 0.8545989 4447.0667477 4447.0667477 4447.0667477
8.5000000 0.7984871 0.7984871 4914.7688403 4914.7688403 4914.7688403
8.6000000 0.7343971 0.7343971 5431.6595914 5431.6595914 5431.6595914
8.7000000 0.6629692 0.6629692 6002.9122173 6002.9122173 6002.9122173
8.8000000 0.5849172 0.5849172 6634.2440063 6634.2440063 6634.2440063
8.9000000 0.5010209 0.5010209 7331.9735392 7331.9735392 7331.9735392
9.0000000 0.4121185 0.4121185 8103.0839276 8103.0839276 8103.0839276
9.1000000 0.3190984 0.3190984 8955.2927035 8955.2927035 8955.2927035
9.2000000 0.2228899 0.2228899 9897.1290587 9897.1290587 9897.1290587
9.3000000 0.1244544 0.1244544 10938.0192082 10938.0192082 10938.0192082
9.4000000 0.0247754 0.0247754 12088.3807302 12088.3807302 12088.3807302
9.5000000 -0.0751511 -0.0751511 13359.7268297 13359.7268297 13359.7268297
9.6000000 -0.1743268 -0.1743268 14764.7815656 14764.7815656 14764.7815656
9.7000000 -0.2717606 -0.2717606 16317.6071980 16317.6071980 16317.6071980
9.8000000 -0.3664791 -0.3664791 18033.7449278 18033.7449278 18033.7449278
9.9000000 -0.4575359 -0.4575359 19930.3704382 19930.3704382 19930.3704382
10.0000000 -0.5440211 -0.5440211 22026.4657948 22026.4657948 22026.4657948
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