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Jul 30th, 2015
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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. float fn(float coeff[], float size, float x)
  5.  
  6. {
  7. float result = 0;
  8. int i=0;
  9. for(i = 0; i < size; i++)
  10. {
  11. result += coeff[i];
  12. result *= x;
  13. }
  14.  
  15. result += coeff[i];
  16.  
  17. return 0;
  18.  
  19. }
  20.  
  21. int main()
  22.  
  23. {
  24. int i,n;
  25. int degree;
  26. printf("Enter the degree: ");
  27. scanf("%d", &degree);
  28.  
  29. float coeff[degree + 1];
  30. printf("Enter the %d coefficients: ",degree + 1);
  31. for(i = 0; i < degree + 1; i++)
  32. {
  33. scanf("%f", &coeff[i]);
  34. }
  35.  
  36. float a, b, s = 0, y = 0, h;
  37. printf("Enter the no of interval =");
  38. scanf("%d", &n);
  39. printf("Enter the lower limit=");
  40. scanf("%f", &a);
  41. printf("Enter the upper limit=");
  42. scanf("%f", &b);
  43. h = (b - a) / n;
  44. for(i = 1 ; i <= n - 1; i++)
  45. {
  46. s = s + fn(coeff, degree, a + i * h);
  47. }
  48.  
  49. y = (fn(coeff, degree, a) + fn(coeff, degree, b) + 2 * s) * h / 2;
  50. printf("the value of y is = %f", y);
  51.  
  52. }
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