2nd Year Computer Science Notes Chapter 5 Arrays and Strings, it series computer book 2nd year pdf free download board of Khyber Pakhtunkhwa (KPK).
KPK Grade 12 Computer Science Arrays and Strings
Table of Contents
Q.5) Write down a C++ program to find the multiplication of two matrices A[3][2] and B[2][3] .
Answer:
int main()
{
int r1, c1, r2, c2, i, j, k;
int A[3][2], B[2][3], C[3][3];
cout << “Enter elements of matrix A : “;
for (i = 0; i < 3; i++)
for (j = 0; j < 2; j++)
cin >> A[i][j];
cout << “Enter elements of matrix B : “;
for (i = 0; i < 2; i++)
for (j = 0; j < 3; j++)
cin >> B[i][j];
for (i = 0; i < 3; i++)
{
for (j = 0; j < 3; j++)
{
C[i][j] = 0;
for (k = 0; k < 2; k++)
{
C[i][j] += A[i][k] * B[k][j];
}
}
}
cout << “Product of matrices\n”;
for (i = 0; i < 3; i++)
{
for (j = 0; j < 3; j++)
cout << C[i][j] << ” “;
cout << “\n”;
}
return 0;
}
Output:
The output of the program is as follows:
Q.6) Write down a C++ program to find the subtraction and addition of two matrices A[3][3] and B[3][3].
Answer:
int main()
{
int i, j;
int A[3][3], B[3][3], Add[3][3], Sub[3][3];
cout << “Enter elements of matrix A : “;
for (i = 0; i < 3; i++)
for (j = 0; j < 3; j++)
cin >> A[i][j];
cout << “Enter elements of matrix B : “;
for (i = 0; i < 3; i++)
for (j = 0; j < 3; j++)
cin >> B[i][j];
for (i = 0; i < 3; i++)
{
for (j = 0; j < 3; j++)
{
Add[i][j] = 0;
Add[i][j] += A[i][j] + B[i][j];
}
}
for (i = 0; i < 3; i++)
{
for (j = 0; j < 3; j++)
{
Sub[i][j] = 0;
Sub[i][j] += A[i][j] – B[i][j];
}
}
cout << “Addition of matrices\n”;
for (i = 0; i < 3; i++)
{
for (j = 0; j < 3; j++)
cout << Add[i][j] << ” “;
cout << “\n”;
}
cout << “Subtraction of matrices\n”;
for (i = 0; i < 3; i++)
{
for (j = 0; j < 3; j++)
cout << Sub[i][j] << ” “;
cout << “\n”;
}
return 0;
}
Output:
The output of the program is as follows:
Q.7) Write a C++ program to find the transpose of a matrix A[3][3].
Answer:
int main()
{
int A[3][3], m, n, i, j;
cout << “Enter elements of matrix : “;
for (i = 0; i < 3; i++)
for (j = 0; j < 3; j++)
cin >> A[i][j];
cout << “Entered Matrix : \n “;
for (i = 0; i < 3; i++)
{
for (j = 0; j < 3; j++)
cout << A[i][j] << ” “;
cout << “\n “;
}
cout << “Transpose of Matrix : \n “;
for (i = 0; i < n; i++)
{
for (j = 0; j < m; j++)
cout << A[j][i] << ” “;
cout << “\n “;
}
return 0;
}
Output:
The output of the program is as follows:
Q.8) Write a C++ program to read the temperature of the whole week in an array and then find the hottest day of the week.
Answer:
int main()
{
float days = 0;
float temperatures[50];
float temptotal = 0;
float average = 0;
float min = 9999999999999;
float max = -9999999999999;
string dayName;
for (int i = 0; i < 7; i++)
{
cout << “Enter the temperature for day number ” << i+1 << ” : “;
cin >> temperatures[i];
temptotal += temperatures[i];
if (temperatures[i] > max)
{
max = temperatures[i];
}
if (temperatures[i] < min)
min = temperatures[i];
}
average = (temptotal / days);
cout << “The Hottest Day is having the Temperature : “<< max << endl;
return 0;
}
Output:
The output of the program is as follows:
Q.9) Write a C++ program to read ten alphabets of English from the keyboard into a character type array and then sort them in descending order.
Answer:
Output:
The output of the program is as follows:
Q.10) Write a C++ program to find sum of the values of a two dimensional array int Test [2][3] and display the result on the screen.
Answer:
int main()
{
int i, j, k;
int A[2][3], Add[2][3], C[3][3];
cout << “Enter elements of matrix A : “;
for (i = 0; i < 2; i++)
for (j = 0; j < 3; j++)
cin >> A[i][j];
for (i = 0; i < 2; i++)
{
for (j = 0; j < 3; j++)
{
Add[i][j] = 0;
Add[i][j] += A[i][j] + A[i][j];
}
}
cout << “Addition of matrices\n”;
for (i = 0; i < 2; i++)
{
for (j = 0; j < 3; j++)
cout << Add[i][j] << ” “;
cout << “\n”;
}
return 0;
}
Output:
The output of the program is as follows:
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