Matrices problems with addition and a variable.

[TBsparky]

Hey everyone, I've got to create a program that calculates matrices in a 2D array, and then add, subtract and display the results. However, i cannot get the addition to work, which i will then use for the subtraction, and i have a problem with "data_input" not being initialized.

here's my code, i hope you can help.

#include <iostream>
using namespace std;
typedef struct Matrices_varibles{
int numbers [3] [4];
int numbers1 [3];
int numbers2 [4];
int row;
int col;
} Matrices_variables;

void data_input(Matrices_variables datamatrices);
void data_output(Matrices_variables datamatrices);
int askselectioninput();
void add_Matrices(Matrices_variables datamatrices);
void subtract_Matrices(Matrices_variables datamatrices);
void display_Matrices(Matrices_variables datamatrices);
void logout();

void main(){
cout<<"========================================="<<endl;
	cout<<"========================================="<<endl;
	cout<<"||   Mutltiple Matrices Calculations    ||"<<endl;
	cout<<"========================================="<<endl;
	cout<<"========================================="<<endl;
	Matrices_variables Data_input;
	int option =0;
	data_input(Data_input);
	while (true){

		option = askselectioninput();

		if (option ==1)
		{

			subtract_Matrices(Data_input);
		}	

		else if (option ==2)
		{

			add_Matrices(Data_input);
		}

		else if (option ==3)
		{

		display_Matrices(Data_input);
		}

		else if (option ==4)
		{
		logout();
		}
	}
}

int askselectioninput(){
	int option= 0;
	cout<<"==============CHOICES====================="<<endl;
	cout<<"||PRESS 1 to SUBTRACT      PRESS 2 to ADD||"<<endl;
	cout<<"||       PRESS 3 to DISPLAY RESULTS      || "<<endl;
	cout<<"=============PRESS 4 to QUIT==============="<<endl;
	cin>>option;
	if (option >0 && option <5){
		return option;
	}

	else {
		cout<<"--Incorrect Value--"<<endl<<endl;
		return askselectioninput();
	}
}

void data_input(Matrices_variables datamatrices)
{
for (datamatrices.row=1; !(datamatrices.row>3); datamatrices.row++)
{ cout<<"Data for row: "<<datamatrices.row<<endl;
for (datamatrices.col=1; !(datamatrices.col>4); datamatrices.col++)
{ cout<<"Type a number: ";
cin>>datamatrices.numbers[datamatrices.row][datamatrices.col];
}
}
}


void data_output(Matrices_variables datamatrices){
cout<<"DISPLAY"<<endl;
for (datamatrices.row=1; !(datamatrices.row>3); datamatrices.row++)
{
for (datamatrices.col=1; !(datamatrices.col>4); datamatrices.col++)
{ cout<<datamatrices.numbers[datamatrices.row][datamatrices.col]<<" ";
}
cout<<"End"<<endl;
}
}

void add_Matrices(Matrices_variables datamatrices){

}

void subtract_Matrices(Matrices_variables datamatrices){
cout<<"SUB"<<endl;
}

void display_Matrices(Matrices_variables datamatrices){
cout<<"DISPLAYING RESULTS :D"<<endl;
for (datamatrices.row=1; !(datamatrices.row>3); datamatrices.row++)
{
for (datamatrices.col=1; !(datamatrices.col>4); datamatrices.col++)
{ cout<<datamatrices.numbers[datamatrices.row][datamatrices.col]<<" ";
}
cout<<"End"<<endl;
}
}


void logout(){
cout<<"Hasta La Vista,"<<endl;
cout<<"--PROGRAM TERMINATED--"<<endl;
exit(0);
}