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演算子 意味
+= a += 1 a = a + 1
-= a -= 1 a = a - 1
*= a *= 1 a = a * 1
/= a /= 1 a = a / 1
%= a %= 1 a = a % 1
演算子 意味
+ 加法 5 + 3
- 減法 5 - 3
* 乗法 5 * 3
/ 除法 5 / 3
% 剰余 5 % 3