how to initialize members of an array of struct in C - c

Question

I have the following struct:
typedef struct {
int someArray[3][2];
int someVar;
} myStruct;
If I create an array of this struct in my main (like the following), how would I initialize it?
int main() {
myStruct foo[5];
}
I want to initialize the above array of struct in a way similar to initilazing a normal array (see below):
int main() {
int someArray[5] = {1,4,0,8,2};
}

Answer 1

Work from the outside in. You know you have an array of 5 things to initialize:
mystruct foo[5] = {
X,
X,
X,
X,
X
};
where X is a stand-in for initializers of type mystruct. So now we need to figure out what each X looks like. Each instance of mystruct has two elements, somearray and somevar, so you know your initializer for X will be structured like
X = { Y, Z }
Substituting back into the original declaration, we now get
mystruct foo[5] = {
{ Y, Z },
{ Y, Z },
{ Y, Z },
{ Y, Z },
{ Y, Z }
};
Now we need to figure out what each Y looks like. Y corresponds to an initializer for a 3x2 array of int. Again, we can work from the outside in. You have an initializer for a 3-element array:
Y = { A, A, A }
where each array element is a 2-element array of int:
A = { I, I }
Subsituting back into Y, we get
Y = { { I, I }, { I, I }, { I, I } }
Substituting that back into X, we get
X = { { { I, I }, { I, I }, { I, I } }, Z }
which now gives us
mystruct foo[5] = {
{ { { I, I }, { I, I }, { I, I } }, Z },
{ { { I, I }, { I, I }, { I, I } }, Z },
{ { { I, I }, { I, I }, { I, I } }, Z },
{ { { I, I }, { I, I }, { I, I } }, Z },
{ { { I, I }, { I, I }, { I, I } }, Z }
};
Since Z is a stand-in for an integer, we don't need to break it down any further. Just replace the Is and Zs with actual integer values, and you're done:
mystruct foo[5] = {
{{{101, 102}, {201, 202}, {301, 302}}, 41},
{{{111, 112}, {211, 212}, {311, 312}}, 42},
{{{121, 122}, {221, 222}, {321, 322}}, 43},
{{{131, 132}, {231, 232}, {331, 332}}, 44},
{{{141, 142}, {241, 242}, {341, 342}}, 45}
};

Answer 2

Wrap the initializer for each structure element of the array in a set of braces:
myStruct foo[5] =
{
{ { { 11, 12 }, { 13, 14 }, { 55, 56 }, }, 70 },
{ { { 21, 22 }, { 23, 24 }, { 45, 66 }, }, 71 },
{ { { 31, 32 }, { 33, 34 }, { 35, 76 }, }, 72 },
{ { { 41, 42 }, { 43, 44 }, { 25, 86 }, }, 73 },
{ { { 51, 52 }, { 53, 54 }, { 15, 96 }, }, 74 },
};

Answer 3

Like that:
int main() {
// someArr initialization | someVar initialization
mystruct foo[5] = { { { {1, 2}, {1,2}, {1, 2} }, 1 }, // foo[0] initialization
//...
};
}