函数指针
#include<stdio.h>
int jug(int x, int y)
{
if (x >= 0)
return x;
else if (y == 0)
return x;
else
return x / y;
}
int sub(int x, int y)
{
return (x + y);
}
int minus(int x, int y)
{
return (x - y);
}
void test(int(*p)(int, int), int a, int b)
{
int Int1;
Int1 = (*p)(a, b);
printf("a=%d,b=%d\n", a, b, Int1);
}
int main()
{
int a = 1, b = 2, c = 3, d = 4, e = -5;
test(sub, a, b);
test(minus, c, d);
test(jug, e, b);
return 0;
}
#include<iostream>
using namespace std;
template<class T>
//建立一个静态模板库
class Operate{
public:
static T Add(T a, T b)
{
return a + b;
}
static T Mul(T a, T b)
{
return a - b;
}
static T Judge(T a, T b = 1)
{
if (a >= 0)
{
return a;
}
else
{
return a / b;
}
}
};
int main()
{
int A, B, C, D, E, x, y, z;
A = 1, B = 2, C = 3, D = 4, E = 5;
x = Operate<int>::Add(A, B);
y = Operate<int>::Mul(C, D);
z = Operate<int>::Judge(E, B);
cout << x << ‘\n‘ << y << ‘\n‘ << z << endl;
return 0;
}
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