Usage and rules of for loop in C language

The for loop is used to repeatedly execute a sequence of statements, to execute components a known number of times, iterate through data, count and accumulate values. Rules include: initialization (start of loop execution), condition (check before loop iteration), and increment (update after loop iteration).

Usage and rules of for loop in C language

What is for loop?

A for loop is a loop structure used to repeatedly execute a series of statements if a specific condition is met.

Syntax

<code class="c">for (initialization; condition; increment) {
    循环体语句
}</code>

Rules

• Initialization: Executed once at the beginning of the loop. Typically used to initialize loop variables.
• condition: Condition checked before each loop iteration. If true, execute the loop body statement; if false, jump out of the loop.
• increment: Executed after each loop iteration. Typically used to update loop variables.

Usage

The for loop is usually used in the following situations:

• Perform a repeated task of a known number of components.
• Traverse an array or other data structure.
• Count or cumulative value.

Example

<code class="c">// 打印 1 到 10 的数字
for (int i = 1; i <= 10; i++) {
    printf("%d\n", i);
}</code>

<code class="c">// 计算数组中所有元素的和
int sum = 0;
for (int i = 0; i < n; i++) {
    sum += arr[i];
}</code>

Note

• The loop condition must always be of type boolean (i.e. true or false).
• Loop variables are not available outside the loop body.
• When using a nested for loop (nested loop), be careful to avoid falling into an infinite loop or stack overflow.

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