Expression Statement (C)
When an expression statement is executed, the expression is evaluated according to the rules outlined in Expressions and Assignments.
All side effects from the expression evaluation are completed before the next statement is executed. An empty expression statement is called a null statement. See The Null Statement for more information.
These examples demonstrate expression statements.
x = ( y + 3 ); /* x is assigned the value of y + 3 */ x++; /* x is incremented */ x = y = 0; /* Both x and y are initialized to 0 */ proc( arg1, arg2 ); /* Function call returning void */ y = z = ( f( x ) + 3 ); /* A function-call expression */
In the last statement, the function-call expression, the value of the expression, which includes any value returned by the function, is increased by 3 and then assigned to both the variables y and z.