This article contains C++ If,
If...Else and Nested If...Else Statement.
C++ If Statement
In C++, if statement can be implemented
in two ways:
(1) Simple if statement
(2) if...else statement
Simple if statement
Syntax:
if(expression is true)
{
//statements
}
Example:
int x=1;
if(x==1)
{
cout<<"x equals 1";
}
Flow Chart
 |
| Flow Chart of If Statement |
Compiler checks if
expression, if expression is
true then compiler executes if code,
otherwise compiler executes other statements below if body.
Program of C++ If Statement
/*C++ program to check even number
using if statement*/
#include<iostream>
using namespace std;
int main()
{
int n;
cout<<"Enter a
number : ";
cin>>n;
if(n%2==0)
{
cout<<n<<" is even number";
}
return 0;
}
OUTPUT:
Enter a number : 56
56 is even number
if...else statement
Syntax:
if(Test Expression)
{
//Statements
}
else
{
//Statements
}
Example:
int x=0;
if(x==1)
{
cout<<"x equals 1";
}
else
{
cout<<"x
equals 0";
}
Flow Chart
 |
| Flow Chart of C++ If Else Statement |
Compiler checks if
expression, if true, then compiler executes if
code, otherwise compiler executes else
code.
Program of C++ If Else Statement
/*C++ program to whether a number is
even or odd using if-else statement*/
#include<iostream>
using namespace std;
int main()
{
int n;
cout<<"Enter a
number : ";
cin>>n;
if(n%2==0)
{
cout<<n<<" is even number";
}
else
{
cout<<n<<" is odd number";
}
return 0;
}
OUTPUT:
Enter a number : 27
27 is odd number
Nested if...else
If...else statement is useful to check
two different possibilities. But if there is need to check more than two
conditions, then nested if...else comes in use.
Nested if...else statement is used to
check more than two conditions.
Syntax:
if (testExpression1)
{
// statements
}
else if(testExpression2)
{
// statements
}
else if (testExpression 3)
{
// statements
}
.
.
else
{
// statements
}
Examples:
int x=0;
if(x<0)
{
cout<<"x is
less than 0";
}
else if(x==0)
{
cout<<"x
equals zero";
}
else
{
cout<<"x is
greater than 0";
}
Program of C++ Nested If Else
/*C++ program to check whether a number is less than 0, equal to 0, between 1 and 100 and greater than 100 using nested if else statement*/
#include<iostream>
using namespace std;
int main()
{
int n;
cout<<"Enter a
number : ";
cin>>n;
if(n<0)
{
cout<<n<<" is less than 0";
}
else if(n==0)
{
cout<<n<<" is equal to 0";
}
else if(n>0 &&
n<=100)
{
cout<<n<<" values lies between 1 and 100";
}
else
{
cout<<n<<" is greater than 100";
}
return 0;
}
OUTPUT:
Enter a number : 101
101 is greater than 100
Posts
0 comments:
Post a Comment