Sharing tips on using the += operator in C language
+= 运算符是一种复合赋值运算符,它通过将变量的当前值与表达式求和并将其存储回变量来简化 код, 累加变量和链式赋值。它可用于累加数组元素、递增计数器等。
C 语言中 += 运算符的使用技巧
+= 运算符
+= 运算符是一种复合赋值运算符,它将变量的当前值与一个表达式求和并将其存储回变量中。其语法为:
variable += expression;
用法技巧
- 简化代码:+= 运算符可以简化代码,减少冗余。例如,以下代码:
a = a + b;
可以使用 += 运算符重写为:
a += b;
- 链式赋值:+= 运算符可以用于将多个值链式赋给一个变量。例如:
a += 5; a += 10; a += 15;
这相当于:
a = a + 5 + 10 + 15;
- 更新累加变量:+= 运算符可用于更新累加变量,例如对数组中的元素求和或计算某个值随时间推移而增长的总和。
实战案例
累加数组元素:
int main() { int arr[] = {1, 2, 3, 4, 5}; int sum = 0; for (int i = 0; i < 5; i++) { sum += arr[i]; } printf("数组元素的总和:%d\n", sum); return 0; }
输出:
``
数组元素的总和:15
``
递增计数器:
int main() { int count = 0; while (count < 10) { count++; // 等价于 count = count + 1 } printf("计数器达到:%d\n", count); return 0; }
输出:
``
计数器达到:10
``
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