?? vararg.cc
字號:
/*
* Sampe program illustrating functions of a variable number of arguments.
*/
#include <cstdarg>
#include <iostream>
double sum(int num, ...);
main() {
double d = sum(3, 0.5, 0.25, 0.125);
double dd = sum(4, 0.5, 0.25, 0.125, 0.0625);
double ddd = sum(5, 0.5, 0.25, 0.125, 0.0625, 0.03125);
std::cout << " d = " << d << std::endl;
std::cout << " dd = " << dd << std::endl;
std::cout << " ddd = " << ddd << std::endl;
}
// num represents the number of arguments
double sum(int num, ...) {
using namespace std;
va_list argPtr;
va_start(argPtr, num); // initialize argPrt. num is the last known argument
double sum = 0;
for( ; num; num--) {
sum += va_arg(argPtr, double); // argument of type double is returned
}
va_end(argPtr); // deallocate stack pointed to by argPtr
return sum;
}
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