1. Example 21 #include<iostream.h> int main() { char Letter = 0;
cout <<"Enter a lower case letter: ";
cin >> Letter;
switch (Letter * (Letter>='a' && Letter <= 'z'))
case 'a':
case 'e':
case 'i':
case 'o':
case 'u': cout <<endl <<"You have entered a vowel.";
break;
case 0: cout <<endl << Letter <<" it is not a lower case letter.";
default: cout <<endl <<"You entered a consonant." ; }
cout <<endl;
return 0;

2. Example 22 #include<iostream.h> int main() {
char indicator ='n';
long value =0,
factorial = 0; do
cout <<"Enter an integer value: ";
cin >> value;
factorial = 1;
for (int i=2; i<=value; i++)
factorial *=i;
cout <<"Factorial " <<value <<" is " <<factorial;
cout <<endl
<<"Do you want to enter another value (y or n)?";
cin >>indicator;
} while ((indicator == 'y')|| (indicator == 'y'));
return 0; }

3. Example 23 #include<iostream.h> #include<iomanip.h>
int main() {
int SIZE =9;
int i=0, j=0;
cout <<SIZE <<" by " <<SIZE <<"multiplication table";
cout <<endl;
cout <<endl <<" |";
for (i=1; i<=SIZE; i++)
cout <<setw(3) <<i <<" ";
for (i=0; i<=SIZE; i++)
cout <<"_____";
cout <<endl
<<setw(3) <<i <<" |";
for (j=1; j<=SIZE; j++)
cout <<setw(3) <<i*j <<" "; }
return 0;

4. Arrays
An array is simply a number of memory locations, each of which can store an item of data of the same data type and which are all referenced through the same variable name.
Type name[size]
Type name[row][column]

5. Example 24 #include <iostream.h> #include <iomanip.h>
int main() {
int array1[6]={1, 2, 3 ,4, 5, 6};
int array2[6]={1, 2, 3};
int array3[6];
for (int i=0; i<6; i++)
cout <<setw(12) <<array1[i];
cout <<endl;
for (i=0; i<6; i++)
cout <<setw(12) <<array2[i];
cout <<setw(12) <<array3[i];
cout <<endl;
return 0; }

6. Example 25 #include <iostream.h> #include <iomanip.h>
int main() {
int array1[2][6]={
{1, 2, 3 ,4, 5, 6}, {6, 5, 4, 3, 2, 1} };
int array2[2][6]={
{1, 2, 3}, {4, 3, 2, 1}
int array3[2][6]={0};
for (int i=0; i<2; i++)
for (int j=0; j<6; j++)
cout <<setw(12) <<array1[i][j];
cout << endl <<endl;
for (i=0; i<2; i++)
cout <<setw(12) <<array2[i][j];
cout <<endl <<endl;
cout <<setw(12) <<array3[i][j];
cout <<endl;
return 0; }