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  1. /*  複利計算
  2. *   年率5％ 元金1000ドルの口座の毎年の残高を求める。
  3. *   ただし、次の式にしがたう。
  4. *    a = p(1+r)^n
  5. *    p: 元金
  6. *    r: 年利率
  7. *    n: 年数
  8. *    a: n年後の元利合計    */
  9.  
  10. #include <stdio.h>
  11. #include <math.h>
  12.  
  13. void fukuri(void);
  14. void d_fukuri(void);
  15. void i_fukuri(void);
  16.  
  17. int main(void)
  18. {
  19.   printf("%4s\t%21s\n","年数","預金残高");
  20. 	fukuri();
  21. 	puts("--------------");
  22. 	d_fukuri();
  23. 	puts("--------------");
  24. 	i_fukuri();
  25.  
  26. 	return 0;
  27. }
  28. void fukuri(void)
  29. {
  30. 	int year;
  31. 	double principal = 1000.0; /* 単位ドル */
  32. 	double rate = .05;
  33. 	double amount; 
  34.  
  35. 	for(year=1; year<=10; ++year) {
  36. 		amount = principal * pow(1.0+rate, year);
  37. 		printf("%4d\t%21.2f\n", year,amount);
  38. 	}
  39. }
  40.  
  41. void d_fukuri(void)
  42. {
  43. 	int year;
  44. 	double principal = 1000.0; /* 単位ドル */
  45. 	double rate = .05;
  46. 	double amount; /* not used */
  47.  
  48. 	for(year=1; year<=10; ++year) {
  49. 		principal = principal * (1+rate);
  50. 		printf("%4d\t%21.2f\n", year, principal);
  51. 	}
  52. }
  53.  
  54. void i_fukuri(void)
  55. {
  56. 	int year;
  57. 	int principal = 1000;
  58. 	int rate = 5; /* 5% */
  59. 	int amount; /* not used */
  60.  
  61. 	principal *= 100; /* 1,000ドル=100,000セント */
  62.  
  63. 	for(year=1; year<=10; ++year) {
  64. 		principal = principal + principal*rate/100;
  65. 		printf("%4d\t%21d.%02d\n", year,principal/100,principal%100);
  66. 	}
  67. }
  68.  
Success #stdin #stdout 0s 2112KB
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stdin
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Standard input is empty
stdout
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年数	         預金残高
   1	              1050.00
   2	              1102.50
   3	              1157.63
   4	              1215.51
   5	              1276.28
   6	              1340.10
   7	              1407.10
   8	              1477.46
   9	              1551.33
  10	              1628.89
--------------
   1	              1050.00
   2	              1102.50
   3	              1157.62
   4	              1215.51
   5	              1276.28
   6	              1340.10
   7	              1407.10
   8	              1477.46
   9	              1551.33
  10	              1628.89
--------------
   1	                 1050.00
   2	                 1102.50
   3	                 1157.62
   4	                 1215.50
   5	                 1276.27
   6	                 1340.08
   7	                 1407.08
   8	                 1477.43
   9	                 1551.30
  10	                 1628.86
https://ideone.com/nk4yvt
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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