please help for this program

[Usergaming]

Create a menu with the following
options:

1. Generate 10 random numbers
between 1 and 15 and stored in an array, add only the even positions.
Using functions not receive and return.


2. Capture keyboard numerical values that are greater than 0, for a 3 by 4 matrix, show the sum of the values in each row. Using functions do not get no return.

Thanks for the help

[Usergaming]

I have advanced to the first point but I find this error: [Error] 'Math' was not esta Declared in scope.
The code goes like this:

#include<iostream>
#include<stdio.h> 

using namespace std;

void pares(int arreg[]); 
void mayor(int arreg[]);  

void promedio_arreglo(); 

int menu(); 
 
float suma; 

int main() 
{ 
int arreglo[10]; 
int opcion; 

pares(arreglo); 

printf("\nQue desea hacer: "); 
do 
{ 
opcion = menu(); 

switch(opcion) 
{ 
case 1: 
pares(arreglo); 
break; 
case 2: 
mayor(arreglo); 
printf("\nLa suma del arreglo es %d\n", suma); 
break; 

default: 
if(opcion != 6) 
{ 
printf("\nEl numero %d no es una opcion valida.\nPro favor introduzca otro numero.\n", opcion); 
} 
} 
}while(opcion != 6); 

printf("\nHASTA LUEGO"); 

return 0; 
} 
int menu() 
{ 
int seleccion; 

printf("\n\t1.\tpares"); 
printf("\n\t2.\tmayor"); 
printf("\n\t6.\tSalir."); 
printf("\n\t\tElija una opcion por favor: "); 

scanf("%d", &seleccion); 

return seleccion; 
} 
void pares(int arreg[]) 
{ 
int arreglo[10]; 
int sum=0; 
for (int i = 0; i < 10; i++)
arreglo[i]=(int) (Math.random()*(15-1+1) + 1)
{  
cout<<i;
if(i%2==0)
sum=sum+arreglo[i]; 
} 

cout<<sum;
}   

[MikeyBoy]

Nowhere in your code is there any definition of Math. What is it supposed to be?