Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
C++ Program to Implement Modular Exponentiation Algorithm
This is a C++ program to implement Modular Exponentiation Algorithm.
Algorithm
Begin function modular(): // Arguments: base, exp, mod. // Body of the function: initialize res = 1 while (exp > 0) if (exp mod 2 == 1) res= (res * base) % mod exp = exp left shift 1 base = (base * base) % mod return res. End
Example
#include <iostream>
using namespace std;
long long modular(long long base, long long exp, int mod) {
long long res = 1;
while (exp > 0) {
if (exp % 2 == 1)
res= (res * base) % mod;
exp = exp >> 1;
base = (base * base) % mod;
}
return res;
}
int main() {
long long b, e;
int mod;
cout<<"Enter Base : ";
cin>>b;
cout<<"Enter Exponent: ";
cin>>e;
cout<<"Enter Modular Value: ";
cin>>mod;
cout<<modular(b, e , mod);
return 0;
}Output
Enter Base : 7 Enter Exponent: 6 Enter Modular Value: 26 25
Updated on: 30-Jul-2019
1K+ Views
Advertisements