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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include<math.h>
  4. #include<string.h>
  5.  
  6.  
  7. int main()
  8. {
  9. 	FILE *fptr, *encode, *fff, *decode, *fxxx, *ffff, *encoderead, *encode2;
  10. 	char FileName[100];
  11. 	int z = 0, number, number2 = 5, a, b = 0, c = 0, d = 0, zz = 8, i = 0, j = 0, k = 0, p = 0;
  12. 	double entropy = 0;
  13. 	char out[5][5] = { 0 }, other[5];
  14. 	fptr = fopen("111.txt", "r"); //輸入檔案
  15. 	fff = fopen("111.txt", "r"); //輸入檔案
  16. 	encode = fopen("encode.txt", "w");// 讀入檔案
  17.  
  18. 	decode = fopen("decode.txt", "w");// 讀入輸入檔案
  19.  
  20. 	float zzz[5] = { 0 }, pro[5] = { 0 }, fx[5] = { 0 }, ffx[5] = { 0 }, lenn = 0, len[4] = { 0 };
  21.  
  22. 	// 出現1-4數字個數
  23. 	while (z < 8)
  24. 	{
  25. 		fscanf(fptr, "%d", &number);
  26. 		zzz[number]++;
  27. 		printf("%d", number);
  28. 		z++;
  29. 	}
  30. 	for (a = 1; a <= 4; a++){
  31. 		printf("\n%.0f", zzz[a]);
  32. 		entropy += (zzz[a] / zz)*log2(zz / zzz[a]);//entropy
  33. 	}
  34. 	printf("\n");
  35. 	//1-4分別出現的機率
  36. 	for (a = 1, b = 1; a, b <= 4; a++, b++){
  37.  
  38. 		pro[b] += (zzz[a] / zz);
  39.  
  40. 		printf("pro=%.5f\n", pro[b]);
  41. 	}
  42. 	printf("\n");
  43. 	//累加值F(X)
  44. 	for (b = 1, c = 1; c <= 4, b <= 4; b++, c++){
  45.  
  46. 		fx[c] += fx[c - 1] + pro[b];
  47.  
  48. 		printf("F(X)=%.5f\n", fx[c]);
  49. 	}
  50. 	printf("\n");
  51.  
  52. 	//出現FX(bar)
  53. 	for (b = 1, c = 0, d = 1; b <= 4, c <= 3, d <= 4; b++, c++, d++){
  54.  
  55. 		ffx[d] = 0.5*pro[b] + fx[c];
  56. 		printf("FFX=%.5f+%.5f", pro[b], fx[c]);
  57. 		printf("=%.5f\n", ffx[d]);
  58.  
  59. 	}
  60. 	//codeword 長度
  61. 	for (i = 0; i <= 3; i++){
  62. 		len[i] = ceil(log2(1 / pro[i + 1]) + 1);
  63. 		printf("%f\n", len[i]);
  64. 	}
  65. 	//Codeword
  66. 	for (d = 1; d <= 4; d++){
  67. 		for (i = 0; i < len[d - 1]; i++){
  68. 			ffx[d] = ffx[d] * 2;
  69. 			if (ffx[d] >= 1){
  70. 				out[d][i] = '1';
  71. 				ffx[d] = ffx[d] - 1;
  72. 			}
  73. 			else{
  74. 				out[d][i] = '0';
  75. 			}
  76. 		}
  77. 		printf("%s\n", out[d]);
  78. 		printf("\n");
  79. 	}
  80. 	//average length
  81. 	for (d = 1; d <= 4; d++)
  82. 	{
  83. 		lenn += len[d - 1] * pro[d];
  84. 	}
  85. 	while (j < zz)
  86. 	{
  87. 		fscanf(fff, "%d", &number);
  88. 		fprintf(encode, "%s", out[number]);
  89. 		j++;
  90. 	}
  91.  
  92. 	fclose(fptr);
  93. 	fclose(fff);
  94. 	fclose(encode);
  95. 	int num,oo,pp,num2;
  96. 	int ok[4][4] = {0};
  97. 	//解碼
  98. 	encode = fopen("encode.txt", "r");// 
  99. 	encode2 = fopen("encode.txt", "r");// 
  100. 	while (k < (float)zz*2.75){
  101.  
  102. 		fscanf(encode, "%1d", &num);
  103.  
  104.  
  105. 		k++;
  106. 	}
  107. 		//fprintf(decode,"%d\n",number2)
  108.  
  109.  
  110. 	printf("entropy=%f\n", entropy);
  111. 	printf("length=%f\n", lenn);
  112.  
  113.  
  114. 	system("pause");
  115. 	return 0;
  116.  
  117. }
Runtime error #stdin #stdout 0s 2240KB
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https://ideone.com/dUPSuZ
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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