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Web Cartoon Maker: a Fun Way to Learn C++ Contents Previous Next

Functions with Multiple Parameters

The syntax for declaring and invoking functions with multiple parameters is a common source of errors. First, remember that you have to declare the type of every parameter. For example:

void PrintTime ( int iHour, int iMinute )


// these will be concatenated just fine

// because there is at least one string

// in every + operation

ShowText ( iHour + ":" + iMinute );


It might be tempting to write (int iHour, iMinute), but that format is only legal for variable declarations, not for parameters.

Another common source of confusion is that you do not have to declare the types of arguments when calling the function. The following is wrong!

int iHour = 11;

int iMinute = 59;

PrintTime (int iHour, int iMinute); // WRONG!

In this case, the compiler can tell the type of hour and minute by looking at their declarations. It is unnecessary and illegal to include the type when you pass them as arguments. The correct syntax is:

int iHour = 11;

int iMinute = 59;

PrintTime ( iHour, iMinute);

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