Output:
2 4 6 8 10.

The selection statement means the statements are executed depends upon a condition. If a condition is true, a true block (a set of statements) is executed, otherwise a false block is executed. This statement is also called decision statement or selection statement because it helps in making decision about which set of statements are to be executed.
Types: (i) Two way branching, (ii) Multiway branching.

Null statement
The "null or empty statement" is a statement containing only a semi colon. It takes the following
form:
;// it is a null statement.
Null statement are commonly used as place holders in iteration statements or as statements on which to place labels at the end of compound statements or functions.
Compound statement
C++ allows a group of statements enclosed by pair of braces (). This group of statements is called as a compound statement or a block.
The general format of compound statement is:
{
statement 1;
statement 2;
statement 3;
}
for example:
{
int a,b;
a-8;
b=a+8;
}

The switch statement is a multi-way branch statement. It provides an easy way to dispatch execution to different parts of code based on the value of the expression. The switch statement replaces multiple if-else sequence.
The syntax of the switch statement is;
switch(expression)
{
case constant 1:
statement(s);
break;
case constant 2:
statement(s);
break;
.
.
.
.
default:
statement(s);
}

The syntax of if-else ladder:
#include <iostream>
using namespace std;
int main()
(
int num:
cout<<"Enter Number to find its multiplication table";
cin >> num;
for (int a = 1; a<= 10; a++)
{
cout << num << "*" << a << "=" << num*a << endl;
}
return 0;
}

a=(x>=10)? m + 5:m;

(a) #include <iostream>
using namespace std;
#include <math.h>
#factorial function.
long int fact(int n)
{
long int f= 1;
for (int i = 1;i<n; i++)
f* = i;
return f
}
// main function
int main()
{
int x, y = 1;
float sum = 0;
cout<<"Enter the value for x:";
cin>>x;
for (int i=1;i<-6; i++)
{
sum = sum + y*((pow(x, 1))/fact(i));
y*=-1;
}
cout<<"Sum=" <<Sum<<endl;
cin.get():
return();
}
(b) #include <iostream>
using namespace std;
#include <math.h>
int main()
{
int M, L;
float sum = 0;
cout<<"Enter the value for M:";
cin>>M;
cout<<"Enter the number of terms";
cin>> L;
for (int i=1;i<=m; i++)
sum Sum + Pow(m,i)/i;
cout<<"Sum="<< Sum<<endl;
cin.get():
return 0;
}

#include <iostream>
using namespace std;
int main()
{
int a1, b1 lem, ged-1, p;
cout << "\n Enter 1st no:";
cin>>a1;
cout << "\n Enter 2nd no:";
cin >> b1;
p=a1*b1;
for (int i = al; i<-p; i++)
if (i%al == 0) && (i%b1 == 0)
{
1cm=i;
break;
}
cin.get():
cout << "L.C.M. =" <<lcm<<endl;
gcd=p/LCM;
cout<<"G.C.D="<< ged;
cin.get():
return 0;
}