Finding Positive and Negative Values in a Matrix in C++

using namespace std;
#include< stdio.h>
#include< stdlib.h>
#include < iostream>

void display(int **Mat, int N, int M){
for(int i = 0; i < N; i++) {
for(int j = 0; j < M; j++) {
Cost < < Mat[i][j];
Cost < < "\t";
}
//display the following line
Cost < < "\n";
}
Cost < < "\n";
}

int main(int argc, char *argv[])
{
int n=3;
int** M = new int* [ n ];
for (int i=0; i < n; i++)
M[i] = new int[ n ];
srand(time(NULL));
for(int i=0; i< n; i++)
for(int j=0; j< n; j++)
//Generate random numbers between 0 and 200 after subtracting 100
e.g. if rand generates 74 then 74-100 = -36
M[i][j] =rand()%200-100;
display(M,n,n);

int negative = 0;
int positive=0;
//browse matrix
for(int i=0; i< n; i++)
for(int j=0; j< n; j++)
{
if(M[i][j]< 0)
negative++;
else
positive++;
}
Cost < < "\n The number of negative values is "< < negative;
Cost < < "\n The number of positive values is "< < positive< < "\n";
system("pause");
}