C4996 ‘scanf‘: This function or variable may be unsafe. Consider using scanf

报文：
严重性代码说明项目文件行禁止显示状态
错误 C4996 ‘scanf’: This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. Demo_001 F:\code\C\Demo\Demo_001\test.c 158

错误原因：Visual Studio编译器错误，不是程序的错误

解决方案1（暂时解决）：

//在程序的第一行添加：#define _CRT_SECURE_NO_WARNINGS 1
#define _CRT_SECURE_NO_WARNINGS 1#include <stdio.h>int main()
{int a = 0;int b = 0;scanf("%d %d", &a, &b);int sum = a + b;printf("%d\n", sum);return 0;
}

解决方案2（本地永久解决）：
找到Visual Studio编译器安装路径下的newc++file.cpp文件，进行编辑，编辑内容修改为：#define _CRT_SECURE_NO_WARNINGS 1
保存成功之后新建.c文件就会自动在第一行生成 #define _CRT_SECURE_NO_WARNINGS 1 的代码了。如果保存不成功的话，切换成管理员模式再进行修改。

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