value initialized member struct

main.cpp

#include <iostream>

using namespace std;

struct X
{
    int a,b,c;
};

struct Y
{
    X x{};
    X xs[10]{};
    int as[10]{};
};

int main()
{
   X xs[10]{};
   for (X x : xs)
   {
       cout << "{" << x.a << "," << x.b << "," << x.c << "} ";
   }
   cout << "\n";
   
   Y y;
   cout << "{" << y.x.a << "," << y.x.b << "," << y.x.c << "}\n";
   for (X x : y.xs)
   {
       cout << "{" << x.a << "," << x.b << "," << x.c << "} ";
   }
   cout << "\n";
   
   for (int a : y.as)
   {
       cout << a << " ";
   }
   cout << "\n";
}

output from webcompiler.cloudapp.net

Compiled with /EHsc /nologo /W4
main.cpp

Compilation successful!

Total compilation time: 109ms

{0,0,0} {0,0,0} {0,0,0} {0,0,0} {0,0,0} {0,0,0} {0,0,0} {0,0,0} {0,0,0} {0,0,0} 

{0,0,0}

{49496989,-1238296826,0} {0,0,0} {1919956480,0,0} {0,50987008,0} {-960810910,50789928,49552880} {50987008,0,8} {5,49677504,14} {50789948,49546403,49679328} {50790016,49546421,4} {49487600,-1238296646,50789996} 

0 0 0 0 0 0 0 0 0 0 

Total execution time: 359ms