#include <iostream>
using namespace std;
void keisan(int a, int b, int &p1, int &p2);
void main(void) {
int tasizan = 0;
int hikizan = 0;
keisan(20, 5, tasizan, hikizan);
cout << "足し算=" << tasizan << '\n';
cout << "引き算=" << hikizan << '\n';
}
void keisan(int a, int b, int &p1, int &p2) {
p1 = a + b;
p2 = a - b;
}
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