赋值语句的返回值

#include <iostream>
using namespace std;
int main()
{
char A[4] = {'a', 'b', 'c', '\0'};
char B[4] = {'A', 'B', 'D', '\0'};
char* a = A;
char* b = B;
while(1)
{
if((*b++ = *a++) == '\0')
{
break;
}
}

}

 

The value of (*b = *a) is from the assigned value, e.g. (*b)

Let' s the answer by GDB.

28if((*b++ = *a++) == '\0')
2: B = "aBD"
1: A = "abc"
(gdb) p (*b = *a)
$2 = 98 'b'
(gdb) n
26while(1)
2: B = "abD"
1: A = "abc"
(gdb) p (*b = *a)
$3 = 99 'c'
(gdb) p &(*b = *a)
$4 = 0xbffff2ea "c"
(gdb) p b
$5 = 0xbffff2ea "c"
(gdb) p a
$6 = 0xbffff2ee "c"