用 C++ 程序实现欧拉定理
这是一个 C++ 程序,演示了欧拉定理的实现。数和模数必须互素,模乘法逆才能存在。
算法
Begin Take input to find modular multiplicative inverse Take input as modular value Perform inverse array function: modInverse(x + 1, 0); modInverse[1] = 1; for i = 2 to x modInverse[i] = (-(y / i) * modInverse[y mod i]) mod y + y return modInverse End
示例代码
#include <iostream> #include <vector> using namespace std; vector<int> inverseArray(int x, int y) { vector<int> modInverse(x + 1, 0); modInverse[1] = 1; for (int i = 2; i <= x; i++) { modInverse[i] = (-(y / i) * modInverse[y % i]) % y + y; } return modInverse; } int main() { vector<int>::iterator it; int a, m; cout<<"Enter number to find modular multiplicative inverse: "; cin>>a; cout<<"Enter Modular Value: "; cin>>m; cout<<inverseArray(a, m)[a]<<endl; }
输出
Enter number to find modular multiplicative inverse: 26 Enter Modular Value: 7 7
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