PredefinedFunctionsDEMO.cpp

//************************************************************************
// Author: Rolando Carreon
// Date: feb 06 2025
// Language: C++
// Assignment: PredefinedFunctionDEMO
// Description: working with predifined strcutures
//************************************************************************

#include<iostream>
// include math functions //
#include<cmath>
using namespace std;

int main()
{
// declare local variables
    int base, exponent;
    int result;
    string string1 = "Hello World!";
    string string2 = "Welcome to C++ Programming.";
    string string3;
    long strLength;
    long startPos;
    

    cout << "Demo of pre-defined functions\n\n";
    
    // get the base and exponent from the user //
    cout << "Please enter the base value:\n";
    cin >> base;
    cout << "Please enter the exponent value: \n";
    cin >> exponent;
    
// calculate the result //
    // uses the <cmath> include to calculate user input //
    // since using int, max value is 2,147,483,647 //
    result = pow(base, exponent);
    cout << base << "^" << exponent << " is " << result << endl;
    
// calculate the square root using the user inputs //
    result = sqrt(base);
    cout << "The square root of " << base << " is " << result << endl;
    
// calculate the absolute value
    cout << "The absolute value of -10 is " << abs(-10) << endl;
    
// find the length of a string //
    // straight up cout the straing1 length instead of saving it to variable //
    cout << "The length of string1 is " << string1.length() << endl;
    // save strLength variable to the string2 length value
    strLength = string2.length();
    
    // cout the saved string2 length varrible from the strLegnth variable
    cout << "The length of string2 is " << strLength << endl;
    
    // find a substring within a string //
    string3 = string1.substr(6,54);
    cout << "The substring is " << string3 << endl;
    
    // find the starting positon of a substring //
    startPos = string1.find("World");
    cout << "The substring \"World\" starts at position " << startPos << endl;
    
    
    return 0;
}