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- #include <cstdio>
- #include <cmath>
- #define eps 0.00001
- using namespace std;
- float radical(float a)
- {
- /// avand valoarea egala cu precizia dorita in calculul radicalului
- float xn1=1, xn=(1+xn1)/2;
- do { xn1=xn;
- xn = (xn1+a/xn1)/2;
- } while (fabs(xn-xn1)>eps);
- /// fabs(x) = |x|, unde x este numar real
- return xn;
- /// rezultatul este ultimul termen calculat al sirului
- }
- int main()
- {
- float a;
- printf("Dati a:"); scanf("%f",&a);
- printf("\nsqrt (%7.3f)=%10.6f",a,sqrt(a));
- /// se compara cele doua functii
- printf("\nradical(%7.3f)=%10.6f",a,radical(a));
- printf("\nCinci zecimale exacte!");
- }
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