Added solution to problem 25

src/Problems.rs

@@ -47,3 +47,4 @@ pub mod Problem21;
 pub mod Problem22;
 pub mod Problem23;
 pub mod Problem24;
+pub mod Problem25;

src/Problems/Problem25.rs

@@ -0,0 +1,61 @@
+//ProjectEulerRust/src/Problems/Problems25.rs
+//Matthew Ellison
+// Created: 06-17-20
+//Modified: 06-17-20
+//What is the index of the first term in the Fibonacci sequence to contain 1000 digits?
+//Unless otherwise listed all non-standard includes are my own creation and available from https://bibucket.org/Mattrixwv/RustClasses
+/*
+	Copyright (C) 2020  Matthew Ellison
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Lesser General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Lesser General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+
+extern crate myClasses;
+use crate::Problems::Answer::Answer;
+
+pub fn getDescription() -> String{
+	"What is the index of the first term in the Fibonacci sequence to contain 1000 digits?".to_string()
+}
+
+pub fn solve() -> Answer{
+	let NUM_DIGITS = 1000;
+	//Setup the variables
+	let mut number = num::BigInt::from(0);
+	let mut index = num::BigInt::from(2);
+
+	//Start the timer
+	let mut timer = myClasses::Stopwatch::Stopwatch::new();
+	timer.start();
+
+	//Move through all Fibonacci numbers unti lyou reach the one with as least NUM_DIGITS digits
+	while(number.to_str_radix(10).len() < NUM_DIGITS){
+		//Increase the index number. Doing this at the beginning keeps the index correct at the end of the loop
+		index += 1;
+		//Calculate the number
+		number = myClasses::Algorithms::getFibBig(num::BigInt::new(index.to_u32_digits().0, index.to_u32_digits().1));
+	}
+
+	//Stop the timer
+	timer.stop();
+
+	//Return the results
+	return Answer::new(format!("The first Fibonacci number with {} digits is {}\nIts index is {}", NUM_DIGITS, number, index), timer.getString());
+}
+
+/* Results:
+The first Fibonacci number with 1000 digits is 1070066266382758936764980584457396885083683896632151665013235203375314520604694040621889147582489792657804694888177591957484336466672569959512996030461262748092482186144069433051234774442750273781753087579391666192149259186759553966422837148943113074699503439547001985432609723067290192870526447243726117715821825548491120525013201478612965931381792235559657452039506137551467837543229119602129934048260706175397706847068202895486902666185435124521900369480641357447470911707619766945691070098024393439617474103736912503231365532164773697023167755051595173518460579954919410967778373229665796581646513903488154256310184224190259846088000110186255550245493937113651657039447629584714548523425950428582425306083544435428212611008992863795048006894330309773217834864543113205765659868456288616808718693835297350643986297640660000723562917905207051164077614812491885830945940566688339109350944456576357666151619317753792891661581327159616877487983821820492520348473874384736771934512787029218636250627816
+Its index is 4782
+It took 1.681 seconds to solve this problem
+*/

src/main.rs

@@ -33,9 +33,9 @@ mod Problems;
 #[derive(PartialEq)]
 enum Selections{EMPTY, SOLVE, DESCRIPTION, LIST, EXIT, SIZE}
 
-static problemNumbers: [u32; 25] = [ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9,
+static problemNumbers: [u32; 26] = [ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9,
 									10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
-									20, 21, 22, 23, 24];
+									20, 21, 22, 23, 24, 25];
 
 fn main(){
 	let mut selection = Selections::EMPTY;
@@ -228,6 +228,10 @@ fn solveProblem(problemNumber: u32){
 		println!("{}", Problems::Problem24::getDescription());
 		println!("{}", Problems::Problem24::solve());
 	}
+	else if(problemNumber == 25){
+		println!("{}", Problems::Problem25::getDescription());
+		println!("{}", Problems::Problem25::solve());
+	}
 }
 fn descriptionMenu(){
 	//Give some extra space to print the description
@@ -325,6 +329,9 @@ fn printDescription(problemNumber: u32){
 	else if(problemNumber == 24){
 		println!("{}", Problems::Problem24::getDescription());
 	}
+	else if(problemNumber == 25){
+		println!("{}", Problems::Problem25::getDescription());
+	}
 }
 fn getProblemNumber() -> u32{
 	println!("Enter a problem number: ");