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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. #include<math.h>
  4.  
  5. double a0(double *Y, int n){
  6. 	int j;
  7. 	double sum=0;
  8.  
  9. 	for(j=0; j<n; j++) sum+=Y[j];
  10. 	sum*=1;
  11. 	sum/=n;
  12.  
  13. 	return sum;
  14. }
  15.  
  16.  
  17.  
  18. double ai(double *Y, int i, int n){
  19. 	int j;
  20. 	double sum=0.0;
  21.  
  22. 	for(j=0; j<n; j++) sum+=Y[j]* cos((2*M_PI*i*(j+1))/n);
  23. 	sum*=2;
  24. 	sum/=n;
  25.  
  26. 	return sum;
  27. }
  28.  
  29.  
  30. double bi(double *Y, int i, int n){
  31. 	int j;
  32. 	double sum=0.0;
  33.  
  34. 	for(j=0; j<n; j++) sum+=Y[j]*sin((2*M_PI*i*(j+1))/n);
  35. 	sum*=2;
  36. 	sum/=n;
  37.  
  38. 	return sum;
  39. }
  40.  
  41.  
  42.  
  43. int main(){
  44.  
  45. 	double *Y; //alokacja wskaznika do tablicy jednowymiarowej
  46.  
  47. 	int n, p=0; // zmienne n i p
  48. 	int i; //zmienna do petli
  49.  
  50. 	//wczytywanie n
  51. 	printf("Type n:\n");
  52. 	scanf("%d",&n);
  53.  
  54. 	//alokacja dynamiczna tablicy pomiarow y
  55. 	Y= (double*) malloc(n*sizeof(double)); 
  56.  
  57. 	//wczytywanie po kolei pomiarow y
  58. 	printf("Type y1...yn: \n");
  59. 	for(i=0; i<n; i++) scanf("%lf",&Y[i]);
  60.  
  61.  
  62. 	//szukanie p
  63. 	while(2*p+1<n) p++; 
  64.  
  65. 	//wypisywanie a0 i b0
  66. 	printf("a0 = %lf", a0(Y,n));
  67. 	printf(", b0 = %lf", bi(Y,0,n));
  68. 	printf("\n");
  69.  
  70. 	//wypiswyanie ai i bi
  71. 	for(i=1; i<p; i++){
  72. 		printf("a%d = %lf", i, ai(Y,i,n));
  73. 		printf(", b%d = %lf", i, bi(Y,i,n));
  74. 		printf("\n");
  75. 	}
  76.  
  77.  
  78. 	return 0;
  79. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.c: In function ‘ai’:
prog.c:22:39: error: ‘M_PI’ undeclared (first use in this function)
  for(j=0; j<n; j++) sum+=Y[j]* cos((2*M_PI*i*(j+1))/n);
                                       ^~~~
prog.c:22:39: note: each undeclared identifier is reported only once for each function it appears in
prog.c: In function ‘bi’:
prog.c:34:38: error: ‘M_PI’ undeclared (first use in this function)
  for(j=0; j<n; j++) sum+=Y[j]*sin((2*M_PI*i*(j+1))/n);
                                      ^~~~
stdout
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Standard output is empty
https://ideone.com/Q9L4pU
language:
C99 (gcc 8.3)
created:
6 years ago
visibility:
public

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