matrix is upper triangular or not

Q4 Write a program to check if the matrix is upper triangular or not
object UpperTrang {
def main(args: Array[String]): Unit =
{
var A=Array.ofDimInt
var m= scala.io.StdIn.readInt()
var n = scala.io.StdIn.readInt()

    for (i <- 0 to m-1)
    {
        for (j <- 0 to n-1)
        {
          A(i)(j)=scala.io.StdIn.readInt()
             
        }
    }

println("The given matrix is ");

    for (i <- 0 to m-1)
    {
        for (j <- 0 to n-1)
        {
            print(A(i)(j)+"\t");
        }
       println(" ");
    }

var isUpper = 1;
for(row<-0 to m-1)

    for(col<-0 to n-1)
    
        if(col<row && A(row)(col)!=0)
        
            isUpper = 0;
        
    

if(isUpper==1)
{
    println("This is a Upper triangular matrix")
    for(row<-0 to m-1)
    
        for(col<-0 to n-1)
        
            if(A(row)(col)!= 0)
            {
                print(A(row)(col) +"");
            }
}   
            else
            {
               println("This is Not a Upper triangular matrix.");
            }

}
}