#include <iostream>
 
void call_by_value(int x, int *y) {
    *y = 2;   // 呼出し元に影響する
    x = 3;    // 呼出し元に影響しない
    static int z = 4;
    y = &z;   // 呼出し元に影響しない
}
 
void call_by_reference(int &x, int *&y) {
    *y = 5;   // 呼出し元に影響する
    x = 6;    // 呼出し元に影響する
    static int z = 7;
    y = &z;   // 呼出し元に影響する
}
 
int main(void) {
    int value = 1;                                       // 値型変数
    int *pointer = &value;                               // ポインタ型変数
    call_by_value(value, pointer);                       // 値型変数、ポインタ型変数の値渡し
    std::cout << value << " " << *pointer << std::endl;  // 2 2	
    call_by_reference(value, pointer);                   // 値型変数、ポインタ型変数の参照渡し
    std::cout << value << " " << *pointer << std::endl;  // 6 7
}

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