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Chapter 1i - Program Control : If Statements |
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If Statements
An if
statement performs a check and controls program execution
based on that check. The if
statement is constructed as follows;
if ( CONDITION )
{
BODY
}
else if( CONDITION )
{
BODY
}
else
{
BODY
}
The body is executed only if the if the condition is True.
Here are 2 examples.
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Example #1 |
Example #2 |
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#define DIFF 0
#define ADD 1
int x;
int y, z;
if( x == ADD)
{
y = y
+ z;
}
else if( x == DIFF)
{
y = y
- z;
}
else
{
} |
int x;
int y;
int z;
if( x == y) /* note that only 1 statement follows */
z =
x;
if( x )
y =
x;
if( x > 0) /* better example of the previous one
*/
{
y =
x;
} |
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