
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
Can you please explain the algorithm for the following c++ code
Source code of program
#include
#include
using namespace std;
bool validate(string input) {
for (int i = 0; i < input.length(); i++) {
if (!isdigit(input[i])) {
return false;
}
}
return true;
}
int factorial(int n) {
int result = 1;
for (int i = 1; i \n2. Calculate n to the m power\n3. Exit program\n";
cout << "Please Enter your choice: ";
getline(cin, input);
if (!validate(input)) {
cout << "Invalid option. Please enter a number between 1 and 3.\n";
continue;
}
int option = stoi(input);
if (option == 1) {
while (true) {
cout << "Enter an integer value for n (1-9): ";
getline(cin, input);
if (!validate(input)) {
cout << "Invalid input. Please enter an integer value.\n";
continue;
}
n = stoi(input);
if (n < 1 || n > 9) {
cout << "Invalid input. Please enter a value between 1 and 9.\n";
continue;
}
break;
}
cout << n << "! = " << factorial(n) << endl;
} else if (option == 2) {
while (true) {
cout << "Enter an integer value for n (1-9): ";
getline(cin, input);
if (!validate(input)) {
cout << "Invalid input. Please enter an integer value.\n";
continue;
}
n = stoi(input);
if (n < 1 || n > 9) {
cout << "Invalid input. Please enter a value between 1 and 9.\n";
continue;
}
break;
}
while (true) {
cout << "Enter an integer value for m (1-9): ";
getline(cin, input);
if (!validate(input)) {
cout << "Invalid input. Please enter an integer value.\n";
continue;
}
m = stoi(input);
if (m < 1 || m > 9) {
cout << "Invalid input. Please enter a value between 1 and 9.\n";
continue;
}
break;
}
cout << n << "^" << m << " = " << power(n, m) << endl;
} else if (option == 3) {
break;
} else {
cout << "Invalid option. Please enter a valid choice\n";
}
}
return 0;
}
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