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- //example 4.4
- #include <bits/stdc++.h>
- using namespace std;
- float x[20], y[20], xy[20], x2[20];
- int main()
- {
- float sumx = 0, sumy = 0, sumx2 = 0, sumxy = 0;
- for (int i = 0; i < 5; i++)
- {
- cin >> x[i] >> y[i];
- y[i] = log(y[i]);
- // cout << y[i] << endl;
- x2[i] = x[i] * x[i];
- xy[i] = x[i] * y[i];
- sumx += x[i];
- sumy += y[i];
- sumx2 += x2[i];
- sumxy += xy[i];
- }
- // for (int i = 0; i < 5; i++)
- // {
- // cout << x2[i] << " " << xy[i] << endl;
- // }
- cout << "value of sumx: " << sumx << " value of sumy: " << sumy << " value of sumx^2: " << sumx2 << " value of sumxy: " << sumxy << endl;
- float a0 = 0, a1 = 0;
- // float a0 = sumy-sumx*a1
- a0 = (sumy * sumx2 - sumx * sumxy) / (5 * sumx2 - sumx * sumx);
- a1 = (5 * sumxy - sumy * sumx) / (5 * sumx2 - sumx * sumx);
- cout << "value of a0: " << a0 << "\tvalue of a1: "
- << a1 << endl;
- float a, b;
- a = exp(a0);
- b = a1;
- cout << a << " " << b << endl;
- return 0;
- }
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