If...Else in C# and VFP
C#
If, Else
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VFP
If, (Then), Else, Endif
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C# Syntax Notes
C# uses the same decision structure as all the other languages based on C. The keyword
if is followed by a boolean expression in brackets
() and then by the code to be executed if this expression
evaluates as true. This can be a simple statement or a block of statements in braces
{}. Optionally this can be followed by the keyword
else and then by the code to be executed if the statement
evaluates as false.
if(a==b)
{
Console.Write("a equals b");
}
else
{
Console.Write("a does not equal b");
}
The structure can be extended by adding an if to
the else clause to switch between multiple options:
if(a>b)
{
Console.Write("a greater than b");
}
else if(a<b)
{
Console.Write("a less than b");
}
else
{
Console.Write("a equals b");
}
VFP Syntax Notes
Visual FoxPro follows the same pattern as Visual Basic in that the block of code
controlled by the if and the optional
else are identified by being on separate lines and
the endif statement closes the whole structure. In FoxPro
the then is optional:
if(a=b)
then
? "a equals b"
else
? "a does not equal b"
endif
This structure cannot be condensed into fewer lines. The if,
else and endif keywords and the
code all have to be on separate lines.
You can't chain if statements together in FoxPro but
there is no need for this feature because each case in a
select case
can have its own independent test.
Warning to programmers from VB or FoxPro
Note the double equals sign in the C#comparison expression. Visual Basic and FoxPro both
use the equals sign to mean two different things. In either language it can mean either
"assign a value" or it can mean "compare these values". C# is different. It uses
the same convention as in C and Java and the only meaning of a single equals sign is to
assign a value. You have to use a double equals in a comparison in C sharp.
Procedures
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Language index
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Case
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