Detailed explanation of += operator in C language

= operator is a compound assignment operator in C language, used to add variable value and expression. The syntax is: variable = expression; it first calculates the expression value, and then adds the result to the current value of the variable. Add, store the calculation result back into the variable, often used to accumulate variable values ​​or update numerical values.

Detailed description of = operator in C language

Introduction

= operator is a compound assignment operator in C language, used to add the original value of a variable to itself and the value of an expression. The syntax is as follows:

变量 += 表达式;

How it works

When the = operator is applied to a variable, it performs the following operations:

1. Calculation The value of the expression (right-hand operand).
2. Add the value of the expression to the current value of the variable.
3. Store the calculation result back into the variable.

Example

For example, the following code snippet uses the = operator to increase the value of variable x by 5:

int x = 10;
x += 5;  // x = x + 5;
printf("%d\n", x);  // 输出 15

Using Scenario

= operator is usually used to accumulate variable values. For example, you can use it to:

• Calculate the sum of array elements
• Increment a counter in a loop
• Update the value step by step

Practical Case

Consider the following C language program to find the sum of array elements:

#include <stdio.h>

int main() {
    int arr[] = {1, 3, 5, 7, 9};
    int sum = 0;

    // 使用+=运算符计算数组元素之和
    for (int i = 0; i < 5; i++) {
        sum += arr[i];
    }

    printf("数组元素之和为：%d\n", sum);  // 输出 25

    return 0;
}

In this example, we use the = operator to gradually add array elements to sum variable to calculate the sum of array elements.

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