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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int main(void) {
  5.    int i;
  6.    double a, b, c, d, e, x0,x1,f0,fPrime,temp;
  7.  
  8.    scanf("%lf%lf%lf%lf%lf%lf", &a, &b, &c, &d, &e, &x0);
  9.  
  10.  
  11.    for (i=0;i<=10000;i++){   
  12.  
  13.       scanf("%lf",&x0);
  14.       f0 = a*(pow(x0,4)) + b*(pow(x0,3)) + c*(pow(x0,2)) + d*x0 + e;
  15.  
  16.       a = 4.00*a;
  17.       b = 3.00*b;
  18.       c = 2.00*c;
  19.  
  20.       fPrime = a*(pow(x0,3)) + b*(pow(x0,2)) + c*x0 + d;
  21.       x1 = x0 - (f0/fPrime);
  22.  
  23.       if (fabs(x0-x1)>0.001){
  24.  
  25.          x1 = x0; 
  26.  
  27.          continue;
  28.  
  29.  
  30.       }   
  31.  
  32.       if (fabs(x0-x1)<0.001){
  33.  
  34.          break;
  35.  
  36.       }
  37.    }
  38.    printf("%.2f\n",x0);
  39.  
  40.    return 0;
  41. }
Success #stdin #stdout 0s 9432KB
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https://ideone.com/WCUZfo
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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