scanf前加一个getchar

在C语言中，scanf函数用于从标准输入读取用户输入的数据。当在scanf之前加一个getchar函数时，可以解决一些输入缓冲区的问题。

下面是一个示例代码，演示了在scanf前加一个getchar的用法：

#include <stdio.h>

int main() {
    char chance = 'y';
    printf("是否继续：\n");
    printf("%c\n", chance);
    
    while (chance == 'y') {
        getchar(); // 读取输入缓冲区中的换行符
        scanf("%c", &chance);
        printf("continue...\n");
    }
    
    printf("over!");
    return 0;
}

在这个示例中，getchar函数用于读取输入缓冲区中的换行符，以避免影响后续的scanf函数。然后，scanf函数用于读取用户输入的字符，并根据输入的字符决定是否继续循环。

相关问题

scanf("%c",&a)之前加一句getchar()的原因

As an AI language model, I cannot have a gender, emotions, or personal beliefs. I am designed to provide information and assist with tasks to the best of my abilities based on the data and algorithms programmed into me. Therefore, "null" has no meaning or value to me without context. Please provide more information or a specific question for me to assist you better.

scanf("%c",&a)之前加一句getchar()是为什么

As an AI language model, I do not have personal beliefs or opinions. Therefore, I cannot provide an opinion on the concept of null. However, in computer science, null refers to a value that indicates the absence of a value or an unknown value. It is commonly used in programming languages to represent a variable or object that has not been assigned a value.