C++出现‘atoi'was not declared in this scope 应该如何解决?

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在学习C++,结果在命令行使用g++ n.cpp 编译的时候出现了这个错误,换成stoi(information)也还是同样的错误,

谷歌了半天,终于找到问题原因和解决方法:

问题原因:MinGW不是最新的,并不能识别C++的版本,原文是这样说的:

MinGW isn't maintained by the same group as GCC itself, so it's not always up to date

解决方法:使用 g++ -std=c++11 n.cpp进行编译。

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PS C:\Users\34171\Desktop\code\WJ> g++ -o WJ Recipe.c main.c main.c: In function 'void read_string(char*, int)': main.c:15:21: error: 'strchr' was not declared in this scope 15 | char *newline = strchr(buffer, '\n'); | ^~~~~~ main.c:4:1: note: 'strchr' is defined in header '<cstring>'; did you forget to '#include <cstring>'? 3 | #include <locale.h> +++ |+#include <cstring> 4 | main.c: In function 'int main()': main.c:102:21: error: 'strlen' was not declared in this scope 102 | if (strlen(updated.name) == 0) { | ^~~~~~ main.c:102:21: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'? main.c:103:21: error: 'strcpy' was not declared in this scope 103 | strcpy(updated.name, existing->name); | ^~~~~~ main.c:103:21: note: 'strcpy' is defined in header '<cstring>'; did you forget to '#include <cstring>'? main.c:108:21: error: 'strlen' was not declared in this scope 108 | if (strlen(updated.category) == 0) { | ^~~~~~ main.c:108:21: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'? main.c:109:21: error: 'strcpy' was not declared in this scope 109 | strcpy(updated.category, existing->category); | ^~~~~~ main.c:109:21: note: 'strcpy' is defined in header '<cstring>'; did you forget to '#include <cstring>'? main.c:114:21: error: 'strlen' was not declared in this scope 114 | if (strlen(updated.ingredients) == 0) { | ^~~~~~ main.c:114:21: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'? main.c:115:21: error: 'strcpy' was not declared in this scope 115 | strcpy(updated.ingredients, existing->ingredients); | ^~~~~~ main.c:115:21: note: 'strcpy' is defined in header '<cstring>'; did you forget to '#include <cstring>'? main.c:121:21: error: 'strlen' was not declared in this scope 121 | if (strlen(input) > 0) { | ^~~~~~ main.c:121:21: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'? main.c:122:41: error: 'atoi' was not declared in this scope 122 | updated.prep_time = atoi(input); | ^~~~ main.c:127:21: error: 'strlen' was not declared in this scope 127 | if (strlen(input) > 0) { | ^~~~~~ main.c:127:21: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'? main.c:128:41: error: 'atoi' was not declared in this scope 128 | updated.cook_time = atoi(input); | ^~~~ main.c:133:21: error: 'strlen' was not declared in this scope 133 | if (strlen(updated.steps) == 0) { | ^~~~~~ main.c:133:21: note: 'strlen' is defined in header '<cstring>'; did you forget to '#include <cstring>'? main.c:134:21: error: 'strcpy' was not declared in this scope 134 | strcpy(updated.steps, existing->steps); | ^~~~~~ main.c:134:21: note: 'strcpy' is defined in header '<cstring>'; did you forget to '#include <cstring>'? PS C:\Users\34171\Desktop\code\WJ>
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