编程学习网为您整理以下代码实例，主要实现：C++按值调用，希望可以帮到各位朋友。
#include <iostream>
using namespace std;
voID swap(int x, int y) {
int temp;
temp = x; /* save the value of x */
x = y; /* put y into x */
y = temp; /* put x into y */
return;
}
// function declaration
voID swap(int x, int y);
int main () {
// local variable declaration:
int a = 100;
int b = 200;
cout << "Before swap, value of a :" << a << endl;
cout << "Before swap, value of b :" << b << endl;
// calling a function to swap the values.
swap(a, b);
cout << "After swap, value of a :" << a << endl;
cout << "After swap, value of b :" << b << endl;
return 0;
}
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