我一直得到一个错误，说”D1D”未被定义？

huangapple
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英文:

I keep getting an error, saying that D1D has not been defined?

问题

  1. import java.lang.Math;
  2. import java.util.Scanner;
  4. public class PlanetExplorer {
  5.     public static void main(String[] args) {
  6.         System.out.println("Explorable Planets:");
  7.         System.out.println(" ");
  8.         System.out.println("Mars:");
  9.         System.out.println("Resources: 50 ");
  10.         System.out.println("Danger: 10%");
  11.         System.out.println(" ");
  12.         System.out.println("Jupiter:");
  13.         System.out.println("Resources: 75 ");
  14.         System.out.println("Danger: 50%");
  15.         System.out.println(" ");
  16.         System.out.println("Titan:");
  17.         System.out.println("Resources: 50 ");
  18.         System.out.println("Danger: 30%");
  19.         System.out.println(" ");
  20.         System.out.println("Uranus:");
  21.         System.out.println("Resources: 100 ");
  22.         System.out.println("Danger: 60%");
  23.         System.out.println(" ");
  24.         System.out.println("Neptune:");
  25.         System.out.println("Resources: 150 ");
  26.         System.out.println("Danger: 75%");
  28.         Scanner Planet1 = new Scanner(System.in);
  29.         String P1 = Planet1.next();
  31.         if ((P1.equals("Mars"))) {
  32.             int min = 1;
  33.             int max = 90;
  34.             int range = max - min + 1;
  35.             int D1R = 50;
  36.             int D1D = (int)(Math.random() * range) + min;
  37.         }
  39.         if ((P1.equals("Jupiter"))) {
  40.             int min = 1;
  41.             int max = 50;
  42.             int range = max - min + 1;
  43.             int D1R = 100;
  44.             int D1D = (int)(Math.random() * range) + min;
  45.         }
  47.         if ((P1.equals("Titan"))) {
  48.             int min = 1;
  49.             int max = 70;
  50.             int range = max - min + 1;
  51.             int D1R = 50;
  52.             int D1D = (int)(Math.random() * range) + min;
  53.         }
  55.         if ((P1.equals("Uranus"))) {
  56.             int min = 1;
  57.             int max = 40;
  58.             int range = max - min + 1;
  59.             int D1R = 60;
  60.             int D1D = (int)(Math.random() * range) + min;
  61.         }
  63.         if ((P1.equals("Neptune"))) {
  64.             int min = 1;
  65.             int max = 25;
  66.             int range = max - min + 1;
  67.             int D1R = 150;
  68.             int D1D = (int)(Math.random() * range) + min;
  69.         }
  71.         if (D1D == 1) {
  72.             int Mmin = 1;
  73.             int Mmax = 3;
  74.             int Mrange = Mmax - Mmin + 1;
  75.             int Message = (int)(Math.random() * Mrange) + Mmin;
  76.             if (Message == 1) {
  77.                 System.out.println("You Died!");
  78.                 System.out.println("Better Luck Next Time!");
  79.             }
  80.             else {
  81.                 if (Message == 2) {
  82.                     System.out.println("Failure!");
  83.                 }
  84.                 else {
  85.                     if (Message == 3) {
  86.                         System.out.println("You Died!");
  87.                         System.out.println("Replay?");
  88.                     }
  89.                 }
  90.             }
  91.         }
  92.     }
  93. }
英文:

I am making a planet exploration text game, where you choose from 5 different planets, each one harder than the one above it, but also more resourceful. I have the Int Variable: "D1D", as the danger value, that is randomised. I have a death screen thing, that activates if D1D = 1, but it keeps saying, that it cant find D1D?
(I am using JDoodle)

  1. import java.lang.Math;
  2. import java.util.Scanner;
  3. public class PlanetExplorer {
  4. public static void main(String[] args) {
  5. //Planets:
  6. System.out.println("Explorable Planets: ");
  7. System.out.println(" ");
  8. System.out.println("Mars: ");
  9. System.out.println("Resorces: 50 ");
  10. System.out.println("Danger: 10%");
  11. System.out.println(" ");
  12. System.out.println("Jupiter: ");
  13. System.out.println("Resorces: 75 ");
  14. System.out.println("Danger: 50%");
  15. System.out.println(" ");
  16. System.out.println("Titan: ");
  17. System.out.println("Resorces: 50 ");
  18. System.out.println("Danger: 30%");
  19. System.out.println(" ");
  20. System.out.println("Uranus: ");
  21. System.out.println("Resorces: 100 ");
  22. System.out.println("Danger: 60%");
  23. System.out.println(" ");
  24. System.out.println("Neptune: ");
  25. System.out.println("Resorces: 150 ");
  26. System.out.println("Danger: 75%");
  27. //Detecting the planet
  28. Scanner Planet1 = new Scanner(System.in);
  29. String P1 = Planet1.next();
  30. // D_R = Day (1-5) Resources
  31. // D_D = Day (1-5) Danger
  32. //If Mars:
  33. if ((P1.equals("Mars"))) {
  34. int min = 1;
  35. int max = 90;
  36. int range = max - min + 1;
  37. int  D1R = 50;
  38. int D1D = (int)(Math.random() * range) + min;
  39. // If Jupier
  40. }
  41. if ((P1.equals("Jupiter"))) {
  42. int min = 1;
  43. int max = 50;
  44. int range = max - min + 1;
  45. int  D1R = 100;
  46. int D1D = (int)(Math.random() * range) + min;
  47. //If Titan
  48. }
  49. if ((P1.equals("Titan"))) {
  50. int min = 1;
  51. int max = 70;
  52. int range = max - min + 1;
  53. int  D1R = 50;
  54. int D1D = (int)(Math.random() * range) + min;
  55. //If Uranus
  56. }
  57. if ((P1.equals("Uranus"))) {
  58. int min = 1;
  59. int max = 40;
  60. int range = max - min + 1;
  61. int  D1R = 60;
  62. int D1D = (int)(Math.random() * range) + min;
  63. //If Neptune
  64. }
  65. if ((P1.equals("Neptune"))) {
  66. int min = 1;
  67. int max = 25;
  68. int range = max - min + 1;
  69. int  D1R = 150;
  70. int D1D = (int)(Math.random() * range) + min;
  71. }
  72. //Here \|/
  73. if (D1D = 1) {
  74. int Mmin = 1;
  75. int Mmax = 3;
  76. int Mrange = Mmax - Mmin + 1;
  77. int Message = (int)(Math.random() * Mrange) + Mmin;
  78. if (Message == 1) {
  79. System.out.println("You Died!");
  80. System.out.println("Better Luck Next Time!");
  81. }
  82. else {
  83. if (Message == 2) {
  84. System.out.println("Failure!");
  85. }
  86. else {
  87. if (Message == 3) {
  88. System.out.println("You Died!");
  89. System.out.println("Replay?");
  90. }
  91. }
  92. }
  93. }
  94. }
  95. }

答案1

得分: 1

你正在局部声明变量（在每个 if 代码块内部声明）。
在 if 代码块之后，变量会再次消失。

你应该在之前声明这些变量：

  1. public static void main(String[] args) {
  2.     int min, max, range, Message, D1R, D1D;

并且只在 if 代码块中为它们赋值：

  1. if ((P1.equals("Neptune"))) {
  2.     min = 1;
  3.     max = 25;
  4.     range = max - min + 1;
  5.     D1R = 150;
  6.     D1D = (int)(Math.random() * range) + min;

由于变量名不一致，编译时可能会出现更多问题，但我希望这能帮助你。

英文:

you are declaring your variables locally (new within each if-block).
After the if-block the variable is gone again.

you should declare the variables before:

  1. public static void main(String[] args) {
  2. int min, max, range, Message, D1R, D1D;

and the only assign values to them in the if-blocks:

  1.     if ((P1.equals("Neptune"))) {
  2. min = 1;
  3. max = 25;
  4. range = max - min + 1;
  5. D1R = 150;
  6. D1D = (int)(Math.random() * range) + min;

you will have some more problems compiling this since the variable names are not consistent, but I hope this will help you.

huangapple
  • 本文由 发表于 2020年10月15日 21:02:37
  • 转载请务必保留本文链接：https://go.coder-hub.com/64372177.html
  • integer
  • java
  • text
  • variables
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