Information Technology Reference
In-Depth Information
The if Statement
The
if
statement implements conditional execution. The syntax for the
if
statement is shown
here, and is illustrated in Figure 9-1.
f
TestExpr
evaluates to
true
,
Statement
is executed.
f t evaluates to
false
,
Statement
is skipped.
TestExpr
must evaluate to a value of type
bool
.
if(
TestExpr
)
Statement
Figure 9-1.
The if statement
The following code shows examples of
if
statements:
// With a simple statement
if( x <= 10 )
z = x - 1; // Single statement, no curly braces needed
// With a block
if( x >= 20 )
{
x = x - 5; // Block--braces needed
y = x + z;
}
int x = 5;
if( x ) // Error: test expression must be a bool, not int
{
...
}
