Day 3 – Variables
Variable: variable is name of place where computer holds the value temporarily in computer’s memory (RAM), that we can use in our program. In PHP variable is defined with “$” sign.
In below program “$a” is a variable contain an integer value “23”, “$b” contain string value “Albert” and $c contain float value “232.44”.
Program 5: Define and display variables in php.
$a = 23;
$b = “Albert”;
$c = 232.44;
echo “Integer value of a is “.$a;
echo “<br/>String value of b is “.$b;
echo “<br/>Float value of c is “.$c;
?>
Note: “.” is used to concatenate string and variable.
Output:
Integer value of a is 23
String value of b is Albert
Float value of c is 232.44
Program 6: Sum of 2 Numbers with constants values.
$a = 2;
$b = 5;
echo “Sum of a and b is “.($a+$b);
?>
Output:
Sum of a and b is 7
Program 7: Swapping values of 2 variables with the help of 3rd variable.
$a = 4;
$b = 6;
$temp = 0;
echo “Value of a before Swapping “.$a;
echo “</br>Value of b before Swapping “.$b;
$temp = $a;
$a = $b;
$b = $temp;
echo “</br>Value of a after Swapping “.$a;
echo “</br>Value of b after Swapping “.$b;
?>
Output:
Value of a before Swapping 4
Value of b before Swapping 6
Value of a after Swapping 6
Value of b after Swapping 4
Program 8: Swapping values of 2 variables without taking 3rd variable.
$a = 4;
$b = 6;
echo “Value of a before Swapping “.$a;
echo “</br>Value of b before Swapping “.$b;
$a = $a + $b;
$b = $a – $b;
$a = $a – $b;
echo “</br>Value of a after Swapping “.$a;
echo “</br>Value of b after Swapping “.$b;
?>
Output:
Value of a before Swapping 4
Value of b before Swapping 6
Value of a after Swapping 6
Value of b after Swapping 4
Assignments:
- Write a program to display multiply, difference and division of 2 numbers.
- Write a program to display sum and average of 5 numbers.
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bestonetechnologies
I am a software developer.
