回答編集履歴
4
ソースの追加
answer
CHANGED
|
@@ -50,4 +50,22 @@
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50
50
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System.out.println(sum);
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51
51
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}
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52
52
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}
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53
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+
```
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54
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+
<追記>
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55
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+
2文字ずつ分けたい場合substringを使うこともできます。
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56
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+
```Java
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57
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+
public class Main {
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58
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+
public static void main(String[] args) throws Exception {
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59
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+
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60
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+
String num = "1234";
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61
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+
String hairetu[] = new String[2];
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62
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+
int sum = 0;
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63
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+
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64
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+
for(int i = 0; i < 2; i++){
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65
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+
hairetu[i] = num.substring(i * 2,i * 2 + 2);
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66
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+
sum += Integer.parseInt(hairetu[i]);
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67
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+
}
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68
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+
System.out.println(sum);
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69
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+
}
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70
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+
}
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53
71
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```
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3
ソースの訂正
answer
CHANGED
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@@ -21,68 +21,33 @@
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21
21
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}
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22
22
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}
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23
23
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```
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24
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-
<
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24
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+
<訂正>
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25
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-
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25
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+
与えられた文字列から求める場合
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|
26
26
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```Java
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27
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-
public class
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27
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+
public class Main {
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28
28
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public static void main(String[] args){
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29
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-
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30
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-
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29
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+
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31
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-
String
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30
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+
String line = "1234";
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32
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-
String []hairetu =
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31
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+
String []hairetu = line.split("");
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33
32
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int sum = 0;
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34
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-
for
|
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33
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+
for(int i = 0; i < 2; i++){
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35
|
-
sum += Integer.parseInt(
|
|
34
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+
sum += Integer.parseInt(hairetu[i * 2] + hairetu[i * 2 + 1]);
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|
36
35
|
}
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|
37
36
|
System.out.println(sum);
|
|
38
37
|
}
|
|
38
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+
|
|
39
39
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}
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|
40
|
-
```
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41
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-
<追記2>
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42
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-
2桁ごと区切ってそれぞれの和を求めるコードを載せておきます。
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43
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-
```Java
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44
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-
public class Sum {
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45
|
-
public static void main(String[] args){
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46
40
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|
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47
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-
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41
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+
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48
|
-
String str = Integer.toString(num);
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49
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-
String []hairetu = str.split("");
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50
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-
int []sum = new int[str.length()];
|
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51
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-
|
|
52
|
-
for(int i = 0; i < 2; i++){
|
|
53
|
-
for(int j = i * 2; j < 2 * i + 2; j++){
|
|
54
|
-
sum[i] += Integer.parseInt(hairetu[j]);
|
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55
|
-
}
|
|
56
|
-
}
|
|
57
|
-
for(int i = 0; i < 2; i++){
|
|
58
|
-
System.out.println(sum[i]);
|
|
59
|
-
}
|
|
60
|
-
}
|
|
61
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-
}
|
|
62
42
|
```
|
|
63
|
-
|
|
43
|
+
与えられた変数から直接求める場合
|
|
64
44
|
```Java
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|
65
|
-
public class
|
|
45
|
+
public class Main {
|
|
66
46
|
public static void main(String[] args){
|
|
67
47
|
|
|
68
48
|
int num = 1234;
|
|
69
|
-
int []pow10 = {1000,100,10,1};
|
|
70
|
-
int []hairetu = new int[4];
|
|
71
|
-
|
|
72
|
-
for(int i = 0; i < 4; i++){
|
|
73
|
-
|
|
49
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+
int sum = num / 100 + num % 100;
|
|
74
|
-
}
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|
75
|
-
int []sum = new int[hairetu.length];
|
|
76
|
-
|
|
77
|
-
for(int i = 0; i < 2; i++){
|
|
78
|
-
for(int j = i * 2; j < 2 * i + 2; j++){
|
|
79
|
-
sum[i] += hairetu[j];
|
|
80
|
-
}
|
|
81
|
-
}
|
|
82
|
-
for(int i = 0; i < 2; i++){
|
|
83
|
-
|
|
50
|
+
System.out.println(sum);
|
|
84
|
-
}
|
|
85
51
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}
|
|
86
|
-
|
|
87
52
|
}
|
|
88
53
|
```
|
2
説明の追加
answer
CHANGED
|
@@ -37,4 +37,52 @@
|
|
|
37
37
|
System.out.println(sum);
|
|
38
38
|
}
|
|
39
39
|
}
|
|
40
|
+
```
|
|
41
|
+
<追記2>
|
|
42
|
+
2桁ごと区切ってそれぞれの和を求めるコードを載せておきます。
|
|
43
|
+
```Java
|
|
44
|
+
public class Sum {
|
|
45
|
+
public static void main(String[] args){
|
|
46
|
+
|
|
47
|
+
int num = 1234;
|
|
48
|
+
String str = Integer.toString(num);
|
|
49
|
+
String []hairetu = str.split("");
|
|
50
|
+
int []sum = new int[str.length()];
|
|
51
|
+
|
|
52
|
+
for(int i = 0; i < 2; i++){
|
|
53
|
+
for(int j = i * 2; j < 2 * i + 2; j++){
|
|
54
|
+
sum[i] += Integer.parseInt(hairetu[j]);
|
|
55
|
+
}
|
|
56
|
+
}
|
|
57
|
+
for(int i = 0; i < 2; i++){
|
|
58
|
+
System.out.println(sum[i]);
|
|
59
|
+
}
|
|
60
|
+
}
|
|
61
|
+
}
|
|
62
|
+
```
|
|
63
|
+
また、最初与えられる"1234"がint型の時はsplit関数を使わず区切る方法があります。
|
|
64
|
+
```Java
|
|
65
|
+
public class Sum {
|
|
66
|
+
public static void main(String[] args){
|
|
67
|
+
|
|
68
|
+
int num = 1234;
|
|
69
|
+
int []pow10 = {1000,100,10,1};
|
|
70
|
+
int []hairetu = new int[4];
|
|
71
|
+
|
|
72
|
+
for(int i = 0; i < 4; i++){
|
|
73
|
+
hairetu[i] = (num / pow10[i]) % 10;
|
|
74
|
+
}
|
|
75
|
+
int []sum = new int[hairetu.length];
|
|
76
|
+
|
|
77
|
+
for(int i = 0; i < 2; i++){
|
|
78
|
+
for(int j = i * 2; j < 2 * i + 2; j++){
|
|
79
|
+
sum[i] += hairetu[j];
|
|
80
|
+
}
|
|
81
|
+
}
|
|
82
|
+
for(int i = 0; i < 2; i++){
|
|
83
|
+
System.out.println(sum[i]);
|
|
84
|
+
}
|
|
85
|
+
}
|
|
86
|
+
|
|
87
|
+
}
|
|
40
88
|
```
|
1
説明の追加
answer
CHANGED
|
@@ -20,4 +20,21 @@
|
|
|
20
20
|
}
|
|
21
21
|
}
|
|
22
22
|
}
|
|
23
|
+
```
|
|
24
|
+
<追記>
|
|
25
|
+
各位の数字の合計を算出する方法です。
|
|
26
|
+
```Java
|
|
27
|
+
public class Sum {
|
|
28
|
+
public static void main(String[] args){
|
|
29
|
+
|
|
30
|
+
int num = 1234;
|
|
31
|
+
String str = Integer.toString( num );
|
|
32
|
+
String []hairetu = str.split("");
|
|
33
|
+
int sum = 0;
|
|
34
|
+
for (String hairetu1 : hairetu) {
|
|
35
|
+
sum += Integer.parseInt(hairetu1);
|
|
36
|
+
}
|
|
37
|
+
System.out.println(sum);
|
|
38
|
+
}
|
|
39
|
+
}
|
|
23
40
|
```
|