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  1. /* Program to find sum of series: 1 + x2/!2 + x4/!4 + x6/!6 …………  ( Cos x ) */
  2.  
  3. #include <stdio.h>
  4.  
  5. float xpower(int j, int x)
  6. {
  7. 	int pwr = 1;
  8. 	for(int i = 1; i <= j; i++)
  9. 		pwr = pwr*x;
  10.  
  11. 	return pwr;
  12. }
  13.  
  14. float xfactorial(int k)
  15. {
  16. 	if (k == 1)
  17. 		return 1;
  18.  
  19. 	int fact = 1;
  20. 	for(int i = 1; i <= k; i++)
  21. 		fact = fact * i;
  22.  
  23. 	//printf("factorial of %d is %d\n", k, fact);
  24. 	return fact;
  25. }
  26.  
  27.  
  28. float SumOfSeries(int steps, int x)
  29. {
  30. 	float result = 0;
  31. 	float power;
  32. 	float factorial;
  33. 	int i, j;
  34.  
  35. 	/* here i will be used to run loop 5 times to get 5 elements and j is used to match the pattern 1+2 for each element in series */
  36. 	for(int i = 1, j = 0; i <= steps; i++, j = j+2)
  37. 	{
  38. 		power = xpower(j, x);
  39. 		factorial = xfactorial(j);
  40.  
  41. 		result = result + power/factorial;
  42.  
  43. 		printf("result is %.2f\n", result);
  44. 	}
  45. 	return result;
  46. }
  47.  
  48. /* Main Function Begins Here */
  49. int main()
  50. {
  51. 	int x;
  52. 	int steps;
  53. 	float result;
  54.  
  55. 	printf("Enter a series steps and X: ");
  56. 	scanf("%d %d", &steps, &x);
  57.  
  58. 	result = SumOfSeries(steps, x);
  59. 	printf("SumOfSeries is %.2f\n", result);
  60. }
  61.  
  62. /* Pending */
Success #stdin #stdout 0s 9424KB
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5
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stdout
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Enter a series steps and X: result is 1.00
result is 3.00
result is 3.67
result is 3.76
result is 3.76
SumOfSeries is 3.76
https://ideone.com/kQTs8Z
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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