fork download
copy 
  1. #include <stdio.h>
  2.  
  3. typedef unsigned int Uint;
  4. #define N 100
  5. #define DP 15
  6. //RADIX == 10^LOG
  7. #define LOG 1
  8. #define RADIX 10
  9. typedef Uint Liczba[N+1];
  10.  
  11. void pisz( Liczba a ){ Uint i;
  12. 	for( i=1; i<=DP && !a[i]; i++ ) printf("%*s", LOG,"");
  13. 	printf("%*u", LOG, a[i]);
  14. 	for( i++; i<=DP; i++ ) printf("%0*u", LOG, a[i]);
  15. 	putchar('.');
  16. 	for(    ; i<=N; i++ ) printf("%0*u", LOG, a[i]); }
  17.  
  18. void plus( Liczba a, Liczba b){                  // a[]:=a[]+b[]
  19. 	for( Uint c=0, i=N; i>0; i-- ){
  20. 		c += a[i]+b[i];
  21. 		a[i] = c % RADIX;
  22. 		c /= RADIX;}}
  23.  
  24. void minus( Liczba a, Liczba b ) {               // a[]:=a[]-b[]
  25. 	for( Uint c=0, i=N; i>0; i-- ){
  26. 		c += b[i];
  27. 		if( a[i]<c ){
  28. 			a[i] = RADIX + a[i] - c; c=1; }
  29. 		else {
  30. 			a[i] -= c; c=0; }}}
  31.  
  32. void razyU( Liczba a, Uint b ) {                 // a[]:=a[] * b
  33. 	for( Uint c=0,i=N; i>0; i-- ){
  34. 		c += a[i]*b;
  35. 		a[i]= c % RADIX;
  36. 		c /= RADIX; }}
  37.  
  38. int podzielU( Liczba w, Liczba a, Uint b ) {     // w[]:=a[] / b
  39. 	Uint z=0;                                // return w[] != 0
  40. 	for( Uint c=0, i=1; i<=N; i++ ) {
  41. 		c = c*RADIX+a[i];
  42. 		w[i]= c/b % RADIX; if( w[i] ) z=1;
  43. 		c = c - w[i]*b;}
  44. 	return z;}
  45.  
  46. void wstawU( Liczba a, Uint b ) {                // a[]:= b
  47. 	Uint i;
  48. 	for( i=0; i<=N; i++ ) a[i]=0;
  49. 	i=DP;
  50. 	while( b ) {
  51. 		a[i--] = b%RADIX; b /= RADIX; }}
  52.  
  53. void atg( Liczba a, Uint x ) {                  // a[]:= atan( 1/x )
  54. 	Liczba px;
  55. 	wstawU( px, 1 ); podzielU( px, px, x );
  56. 	wstawU( a,  0 ); plusU   ( a, px );
  57. 	for( Uint n=1;   ; n++){
  58. 		Liczba b;
  59. 		podzielU( w, w, x*x );
  60. 		if( ! podzielU( b, w, 2*n + 1 ) )
  61. 			break;
  62. 		if( n & 1 ) plus( a, b );
  63. 		else minus( a, b );}}	            
  64.  
  65. int main(void) {
  66. 	Liczba a;
  67. 	atg( a, 5 );pisz(a); puts("");
  68. 	printf("\n%0.14f\n", atan(1/5.0 ));
  69. 	return 0;
  70. }
  71.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
copy 
Standard input is empty
compilation info 
cc1: warnings being treated as errors
prog.c: In function ‘atg’:
prog.c:56: error: implicit declaration of function ‘plusU’
prog.c:59: error: ‘w’ undeclared (first use in this function)
prog.c:59: error: (Each undeclared identifier is reported only once
prog.c:59: error: for each function it appears in.)
prog.c: In function ‘main’:
prog.c:68: error: implicit declaration of function ‘atan’
prog.c:68: error: incompatible implicit declaration of built-in function ‘atan’
stdout
copy 
Standard output is empty
https://ideone.com/57llt
language:
C99 (gcc 8.3)
created:
14 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!