DATA TYPES AND VERIABLES
“Variables” are simply storage locations for data. You can place data into them and retrieve their contents as part of a C# expression. The interpretation of the data in a variable is controlled through “Types”.
The C# simple types consist of:
·
Boolean type
·
Numeric types: Integrals, Floating Point, Decimal
·
String type
BOOLEAN TYPES
Boolean types are declared using the keyword “bool”. They have two values: “true” or “false”. In other languages, such as C and C++, boolean conditions can be satisfied where 0 means false and anything else means true. However, in C# the only values that satisfy a boolean condition is true and false
Example:
bool content = true; bool
noContent=false ;
Numeric types: Integrals, Floating Point, Decimal
Example:int i=35;
long y=654654;
float x;
decimal z;
String type
Example: string myString=”Hai everyone”;
Special characters that may be used in strings:
Arrays
Example: int[] myInts = { 5, 10, 15 };
Numeric types: Integrals, Floating Point, Decimal
Example:int i=35;
long y=654654;
float x;
decimal z;
String type
Example: string myString=”Hai everyone”;
Special characters that may be used in strings:
Arrays
Example: int[] myInts = { 5, 10, 15 };
To be able to control the flow in your program is important in every programming language.
The two most important techniques are:
The if Statement
The switch Statement
The if Statement
The if Statement
The switch Statement
The if Statement
The if statement is probably the most used mechanism to control the flow in your application. An if statement allows you to take different paths of logic, depending on a given condition. When the condition evaluates to a Boolean true, a block of code for that true condition will execute. You have the option of a single if statement, multiple else if statements, and an optional else statement.
Example:
myTest=false;
if (myTest==false)
{
essageBox.Show("Hello”);
}
output:
For more complex logic we use the if … else statement.
Example:
bool myTest;
myTest=true;
if (myTest == false)
{
MessageBox.Show("Hello1");
}
else
{
MessageBox.Show("Hello2");
}
Or you can use nested if… else if sentences.
Example:
int myTest;
myTest=2;
if (myTest == 1)
{
MessageBox.Show("Hello1");
}
else if (myTest == 2)
{
MessageBox.Show("Hello2");
}
else
{
MessageBox.Show("Hello3");
}
Another form of selection statement is the switch statement, which executes a set of logic depending on the value of a given parameter. The types of the values a switch statement operates on can be booleans, enums, integral types, and strings.
switch (myTest)
Example:
myTest=false;
if (myTest==false)
{
essageBox.Show("Hello”);
}
output:
Example:
bool myTest;
myTest=true;
if (myTest == false)
{
MessageBox.Show("Hello1");
}
else
{
MessageBox.Show("Hello2");
}
Or you can use nested if… else if sentences.
Example:
int myTest;
myTest=2;
if (myTest == 1)
{
MessageBox.Show("Hello1");
}
else if (myTest == 2)
{
MessageBox.Show("Hello2");
}
else
{
MessageBox.Show("Hello3");
}
