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  1. #define _CRT_SECURE_NO_WARNINGS
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4.  
  5. int input(int zero)
  6. {
  7. 	int i;
  8.  
  9. 	while (1) {
  10. 		scanf("%d", &i);
  11. 		if (i == 0 && zero) {
  12. 			continue;
  13. 		}
  14. 		if (i < -32768 || 32767 < i) {
  15. 			continue;
  16. 		}
  17. 		break;
  18. 	}
  19. 	return i;
  20. }
  21.  
  22. int main()
  23. {
  24. 	int bi1, bo1, op, bi2, bo2;
  25. 	int bi, bo;
  26. 	int g1, g2, g3;
  27.  
  28. 	printf("1番目分数の分子=\n");
  29. 	bi1 = input(0);
  30. 	printf("1番目分数の分母=\n");
  31. 	bo1 = input(1);
  32.  
  33. 	printf("演算子(1:足し算 2:引き算 3:掛け算 4:割り算)=\n");
  34. 	do {
  35. 		scanf("%d", &op);
  36. 	} while (op < 1 || 4 < op);
  37.  
  38. 	printf("2番目分数の分子=\n");
  39. 	bi2 = input(op == 4);
  40. 	printf("2番目分数の分母=\n");
  41. 	bo2 = input(1);
  42.  
  43. 	switch (op) {
  44. 	case 1:	// 足し算
  45. 		bi = bi1 * bo2 + bi2 * bo1;
  46. 		bo = bo1 * bo2;
  47. 		break;
  48. 	case 2:	// 引き算
  49. 		bi = bi1 * bo2 - bi2 * bo1;
  50. 		bo = bo1 * bo2;
  51. 		break;
  52. 	case 3:	// 掛け算
  53. 		bi = bi1 * bi2;
  54. 		bo = bo1 * bo2;
  55. 		break;
  56. 	case 4:	// 割り算
  57. 		bi = bi1 * bo2;
  58. 		bo = bo1 * bi2;
  59. 		break;
  60. 	}
  61.  
  62. 	// 約分 ユークリッドの互除法
  63. 	g1 = bi;
  64. 	g2 = bo;
  65. 	while (g3 = g1 % g2) {
  66. 		g1 = g2;
  67. 		g2 = g3;
  68. 	}
  69. 	bi /= g2;
  70. 	bo /= g2;
  71.  
  72. 	if (bo == 1) {
  73. 		printf("%d\n", bi);
  74. 	} else if (bi == 0) {
  75. 		printf("%d\n", bi);
  76. 	} else {
  77. 		printf("%c%d/%d\n", (bi * bo < 0) ? '-' : ' ', abs(bi), abs(bo));
  78. 	}
  79. 	return 0;
  80. }
  81.  
Success #stdin #stdout 0.01s 2684KB
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stdin
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-3
10
3
-6
5
stdout
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1番目分数の分子=
1番目分数の分母=
演算子(1:足し算 2:引き算 3:掛け算 4:割り算)=
2番目分数の分子=
2番目分数の分母=
 9/25
https://ideone.com/HUreA
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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