Visual Studio 2015 - _CRT_SECURE_NO_WARNINGS

1._CRT_SECURE_NO_WARNINGS

1>------ Build started: Project: yongqiang, Configuration: Debug Win32 ------ 1> foreverstrong.c 1>d:\visual_studio_workspace\yongqiang\yongqiang\foreverstrong.c(51): error 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. 1> c:\program files (x86)\windows kits\10\include\10.0.10240.0\ucrt\stdio.h(1270): note: see declaration of 'scanf' ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

error 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. error C4996: 'strtok': This function or variable may be unsafe. Consider using strtok_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. error C4996: 'fopen': This function or variable may be unsafe. Consider using fopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

2._CRT_SECURE_NO_WARNINGS

2.1. 文件开头添加代码

#define _CRT_SECURE_NO_WARNINGS

#ifndef _CRT_SECURE_NO_WARNINGS #define _CRT_SECURE_NO_WARNINGS #endif

注意，必须是文件的第一行，要在没有include任何头文件之前。

2.2. 项目添加预处理定义

项目 -> 属性 -> 配置属性 -> C/C++ -> 预处理器 -> 预处理定义

_CRT_SECURE_NO_WARNINGS
a. 与前面的要用分号分开，后面加分号。
b. 换行添加。

/* ============================================================================ Name : hello_world.c Author : Yongqiang Cheng Version : Version 1.0.0 Copyright : Copyright (c) 2019 Yongqiang Cheng Description : Hello World in C, Ansi-style ============================================================================ */ #define _CRT_SECURE_NO_WARNINGS #include <stdio.h> #include <string.h> int compute_word_length(const char *input_string) { const char *string_pointer = input_string; int string_length = 0; int idx = 0; int word_length = 0; if (NULL == input_string) { return 0; } string_length = strlen(input_string); if (0 == string_length) { return 0; } for (idx = string_length - 1; string_pointer[idx] != ' '; idx--) { word_length++; if (string_length == word_length) { break; } } return word_length; } int main() { char input_string[5000] = { 0 }; int word_length = 0; int idx = 0; while (EOF != scanf("%c", &(input_string[idx]))) { idx++; } if ('\n' == input_string[strlen(input_string) - 1]) { input_string[strlen(input_string) - 1] = '\0'; } word_length = compute_word_length(input_string); printf("%d\n", word_length); return 0; }

退出循环：

qiang + Enter Ctrl + Z + Enter Ctrl + Z + Enter

References

[1] Yongqiang Cheng (程永强), https://yongqiang.blog.csdn.net/