ECE-1011 (SPRING
2003)
QUIZ
#7 PREP SHEET
NOTE: Some of these questions/statements require you to think beyond the
strict information given in the text.
1)
An array
is:
a)
a group
of values having a common variable name and all of the same data type.
b)
a
collection of elements of different data types that are stored in adjacent
memory locations.
c)
a
variable that contains multiple values of different data types.
d)
a
location in memory that holds multiple values of the same data type.
2)
How is an
individual element in an array addressed?
3)
The
subscript identifies the ________________ of
a particular element in the array?
4)
What does
the following code fragment do?
sum = 0;
for(row=0; row<n_rows; row++)
sum += Table[row][2];
5)
Give
corresponding snapshots of memory after each of the following sets of code
fragments is executed. Use ? to
indicate an array element that is not initialized.
int r,c,x[4][5]
...
for(r=0; r<=3; r++)
{
for(c=0;c<=4; c++)
{
x[r][c] = r + c;
}
}
6)
Give the
value in sum after the following code fragment is executed:
int x[4][4] =
{{1,2,3,4},{5,6,7,8},{9,8,7,3},{2,1,7,1}};
...
sum = 0;
for(i=1; i<=3; i++)
{
for(j=0; j<=3; j++)
{
if(x[i][j] > x[i-1][j])
sum++;
}
}
7)
What does
strcmp(s[],t[]) return if:
char s[] = “Hello”;
char t[7] = “HELLO”;
8)
What is
the result of the following code fragment?
int x[][3] = {{2,3,1},
{0,-3,5}};
...
return (x[2][2]);
9)
What is
the value of y[2][3] after the following code fragment has been run?
int i,j, n=3;
double y[n][n];
...
for(i=0; i<=n-1; i++)
{
for(j=0;
j<=n-1; j++)
{
y[j][i] = n*(j+i);
}
}
10)
What is
the average and the median of x if:
x[9] = {0,1,2,2,6,6,6,7,8};
11)
How is
standard deviation related to variance?
12)
What is
deviance a measure of?
13)
In the
function declaration:
double mean( double x[], int n)
What value should n contain?
14)
Arrays
are passed into functions by reference rather than by value.
What does that mean?