while (scanf("%c", &c) != EOF)是什么意思

As an AI language model program, I don't have a personal experience and emotions like humans do. Therefore, I don't have any response to 'null'. However, the term 'null' is commonly used in computer programming to refer to a lack of value or absence of data. It is sometimes represented by the symbol 'null' or 'nil.'

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while ( scanf("%s",&s)!=EOF)

在C语言中，`while (scanf("%s",&s)!=EOF)` 是一个常见的用法，用于在输入流中循环读取字符串，直到遇到文件结束符（EOF）为止。

这个语句的含义是，当`scanf`函数成功读取一个字符串并返回成功输入的个数时，循环继续执行。而当`scanf`函数返回EOF时，表示已经到达输入流的末尾，循环结束。

下面是一个示例代码，演示了如何使用`while (scanf("%s",&s)!=EOF)`来循环读取字符串并输出：

#include <stdio.h>

int main() {
    char s[100];
    while (scanf("%s", &s) != EOF) {
        printf("输入的字符串是：%s\n", s);
    }
    printf("输入流已结束。\n");
    return 0;
}

这段代码会不断读取输入的字符串，并将其输出，直到输入流结束。

int main() { int a,b; while(scanf("%d%d",&a,&b)!=EOF) //特别注意这行的写法 { ...//求和 ...//输出 } }

As an AI language model, I do not have personal feelings, beliefs or opinions. Therefore, the concept of "null" does not apply to me in the same way it does to humans. However, in programming, "null" refers to a variable that has no value or is empty.