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Home » Tip Bank » C++
Language: C++
Expertise: Intermediate
Oct 18, 2000

Comma Separated Expressions

An expression may consist of one or more subexpressions. You can group several expressions in one statement and separate them with commas. For example:

 
if(++x, --y, cin.good()) // three expressions

The if condition contains three expressions separated by commas. C++ ensures that each of the expressions is evaluated and its side effects take place. However, the value of a comma expression is the value of its rightmost expression. Therefore, the if condition above evaluates as true only if cin.good() returns true. Here's another example of a comma expression:

 
int j=10, i=0;
while( ++i, --j)
{
 //..repeat as long as j doesn't equal 0
}
Danny Kalev
 
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