Usage of do while in c language

The do-while loop is suitable for situations where you need to check the loop condition after executing the loop operation at least once: execute the loop body statement first. Check the loop conditions again. If the loop condition is true, execution of the loop body continues.

Do-while usage in C language

do-while loop is a method used in C language A control structure that checks the loop condition after executing the loop body at least once.

Syntax:

<code class="c">do {
    循环体语句;
} while (循环条件);</code>

Usage:

do-while loop first executes the statement in the loop body, and then checks the loop condition . If the loop condition is true, continue executing the loop body, otherwise exit the loop. Unlike while loops, do-while loops execute the loop body at least once, even if the loop condition is false at the beginning.

When to use a do-while loop:

The do-while loop is suitable for use when you need to check the loop condition after executing the loop operation at least once. For example, you might need to get user input before checking whether the input is valid.

Example:

<code class="c">#include <stdio.h>

int main() {
    int number;

    do {
        printf("请输入一个正整数：");
        scanf("%d", &number);
    } while (number <= 0);

    printf("您输入的正整数是：%d", number);

    return 0;
}</code>

In this example, the do-while loop will prompt the user for input at least once. If the user enters a non-positive integer, the loop continues until the user enters a positive integer.

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