c-resources/CPlusPlus20ForProgrammers-m.../examples/ch07/fig07_10.cpp

40 lines
1.6 KiB
C++

// fig07_10.cpp
// Sizeof operator when used on a built-in array's name
// returns the number of bytes in the built-in array.
#include <fmt/format.h>
#include <iostream>
size_t getSize(double* ptr); // prototype
int main() {
double numbers[20]; // 20 doubles; occupies 160 bytes on our system
std::cout << fmt::format("Number of bytes in numbers is {}\n\n",
sizeof(numbers));
std::cout << fmt::format("Number of bytes returned by getSize is {}\n",
getSize(numbers));
}
// return size of ptr
size_t getSize(double* ptr) {
return sizeof(ptr);
}
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