#include union utype { int i; double x; }s1,s2,p=&s1; void main() { s1.x=123.4; s1.#include union utype{\x05int i;\x05double x;}s1,s2,p=&s1;void main(){\x05s1.x=123.4;\x05s1.i=100;\x05int x=sizeof(s2);int y=sizeof(s1);int z=sizeof(*p);\x05printf("%

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#include union utype { int i; double x; }s1,s2,*p=&s1; void main() { s1.x=123.4; s1.#include union utype{\x05int i;\x05double x;}s1,s2,*p=&s1;void main(){\x05s1.x=123.4;\x05s1.i=100;\x05int x=sizeof(s2);int y=sizeof(s1);int z=sizeof(*p);\x05printf("%
#include union utype { int i; double x; }s1,s2,*p=&s1; void main() { s1.x=123.4; s1.
#include
union utype
{
\x05int i;
\x05double x;
}s1,s2,*p=&s1;
void main()
{
\x05s1.x=123.4;
\x05s1.i=100;
\x05int x=sizeof(s2);
int y=sizeof(s1);
int z=sizeof(*p);
\x05printf("%d %d %d %d\n",s1.x,x,y,z);
}
为什么 y,z都是8 x不等于8?x的输出=1079957913
可是
#include
union utype
{
\x05int i;
\x05double x;
}s1,s2,*p=&s1;
void main()
{
\x05int x=sizeof(s2);
int y=sizeof(s1);
int z=sizeof(*p);
\x05printf("%d %d %d %d\n",x,y,z);
}
这时候x y z又都是8了
到底是什么原因呢我知道从字面看是赋值引起的就是求下解释