此代码只是为了测试我对结构数组访问的知识。当我执行此代码时,它给我带来了两个param的初始化两个初始化。请帮助我了解错误并解决此问题。我试图重用某人已经解决的代码。我关于用参数填充strum_u param param
的问题的问题#include <iostream>
#include <stdio.h>
#include <string.h>
#define ARRAY_COUNT(arr) (sizeof (arr) / sizeof *(arr))
typedef union {
struct { // Function parameters
int *array;
size_t size;
};
struct { // Function return value
float mean;
int Median;
};
} Param_u;
int main() {
int array_1[] = {1, 2, 3, 4, 5};
int ret1, ret2;
// Fill the Struct with parameters
Param_u param = {
.array = array_1,
.size = ARRAY_COUNT(array_1),
};
return 0;
}
这不是标准的C 。您正在使用匿名struct
&amp;指定的初始化器(C99功能(。C 不支持这一点。在clang 上启用-pedantic-errors
选项&amp;g++
。有关更多详细信息,请参阅此问题。您使用的是编译器特定的扩展名,因此您的程序无法便携。
请参阅此处的实时演示。
clang++
给出以下诊断:
Error(s):
source_file.cpp:12:5: error: anonymous structs are a GNU extension [-Werror,-Wgnu-anonymous-struct]
struct { // Function parameters
^
source_file.cpp:16:5: error: anonymous structs are a GNU extension [-Werror,-Wgnu-anonymous-struct]
struct { // Function return value
^
source_file.cpp:28:9: error: designated initializers are a C99 feature [-Werror,-Wc99-extensions]
.array = array_1,
^~~~~~~~~~~~~~~~
source_file.cpp:29:9: error: designated initializers are a C99 feature [-Werror,-Wc99-extensions]
.size = ARRAY_COUNT(array_1),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
source_file.cpp:24:16: warning: unused variable 'ret2' [-Wunused-variable]
int ret1, ret2;
^
source_file.cpp:27:13: warning: unused variable 'param' [-Wunused-variable]
Param_u param = {
^
source_file.cpp:24:10: warning: unused variable 'ret1' [-Wunused-variable]
int ret1, ret2;
^
3 warnings and 4 errors generated.