Syntax and rule analysis of C++ variable parameters
C Variable parameters allow the function to accept any number of parameters. The syntax is: returnType functionName(type1 arg1, ..., typeN argN, ...). The rules include: it must be placed after the fixed parameter, there can only be one, the type must be a built-in type, a class object or a pointer, and the quantity is determined when calling. In practice, the sum function calculates the sum of all parameters: int sum(int n, ...) {...}.
C Syntax and rule analysis of variable parameters
Variable parameters are a special function parameter syntax in C, which allows the function to accept any number parameters. This is useful when implementing functions that need to adapt to dynamically changing parameter lists.
Syntax
returnType functionName(type1 arg1, type2 arg2, ..., typeN argN, ...)
Where:
returnType
is the return value type of the function.functionName
is the name of the function.arg1
,arg2
, ...,argN
are of typestype1
,type2# respectively Fixed parameters of ##, ...,
typeN.
- ...
represents variable parameters. The ellipsis can be followed by an identifier that indicates the type of the variadic argument.
- Variable parameters must be placed after fixed parameters. There can only be one variable parameter. The type of variable parameters must be a built-in type, class object or pointer type. The number of variable parameters can only be determined when calling.
sum to calculate the sum of all its parameters:
int sum(int n, ...) { va_list args; va_start(args, n); int result = n; int arg; while ((arg = va_arg(args, int)) != 0) { result += arg; } va_end(args); return result; }
int total1 = sum(1, 2, 3, 4, 5); // 总和为 15 int total2 = sum(2, 4, 6, 8, 10); // 总和为 30
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