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Chapter 7: Functions > Parameter Passing Modes
Parameter Passing Modes
Function declarations specify a list of parameters, or formal arguments. At the call site, the source code location where the function is invoked, a name of the function to call is followed by a parenthesized list of corresponding actual arguments. The types passed to a function must match the formal list of arguments types declared at the function.
int myFunc( int j ) // 'j' is a formal argument
{
return j + 10;
}
…
myInt = myFunc(5); // the literal '5' is an actual argument
packetC parameters can be passed in two modes:
- By value: the value of each actual argument is copied to the corresponding formal argument.
- By substitution: the function being called is inlined; each actual argument accompanied by the “@” symbol is substituted into the inlined function's body to replace each instance of the corresponding formal argument. packetC supports by-substitution parameters that are constants, expressions, and const variables if the called function does not assign values to the corresponding formal argument.