#include <iostream>
using namespace std;
// Student ID: 20511146
//
// Looping_Functions.cpp
//
// Created by Anand Venkataraman on 8/9/19.
// Copyright © 2019 Anand Venkataraman. All rights reserved.
//
#include <iostream>
#include <sstream>
using namespace std;
// Give the user 6 chances to guess the secret number n (0-10). If they get it,
// say so and return true. Else say so and return false.
bool play_game(int n){
printf("Welcome to my number guessing game\n\n");
int x;
for (int i = 1; i <= 6; i++){
printf("Enter your guess: ");
string s;getline(cin, s);
istringstream iss(s);
iss >> x;printf("\n");
printf("You entered: %d\n", x);
if (x==n){
printf("You found it in %d guess(es).\n", i);
return true;
}
}
printf("\nI'm sorry. You didn't find my number.\n");
printf("It was %d\n\n", n);
return false;
}
double etox(double x, size_t n){
double ans = 0;
double X = 1.0;
double fac = 1.0;
for (size_t i = 0; i < n; i++){
if (i!=0) fac *= i;ans += X/fac;X *= x;
}
return ans;
}
// Return the number of occurrences of char c in string s
size_t count_chars(string s, char c) {
size_t occur = 0;
for(size_t i = 0;i<s.length();i++){
if(s[i] == c){
occur += 1;
}
}
return occur;
}
// Use Euclid's algorithm to calculate the GCD of the given numbers
size_t gcd(size_t a, size_t b) {
if (a == 0)
return b;
if (b == 0)
return a;
if (a == b)
return a;
if (a > b)
return gcd(a-b, b);
return gcd(a, b-a);
}
// Return a string of the form n1,n2,n3,... for the given AP.
string get_ap_terms(int a, int d, size_t n) {
string ap = "";
int currentTerm;
for (size_t i=0; i<n; i++) {
currentTerm = a+(i)*d;
ap = ap + to_string(currentTerm) + ",";
}
ap = ap.substr(0,ap.size()-1);
return ap;
}
// Return a string of the form n1,n2,n3,... for the given GP.
string get_gp_terms(double a, double r, size_t n) {
string gp="";
ostringstream ss2;
for(size_t i=1;i<=n-1;i++){
ostringstream ss1;
ss1<<a;
gp.append(ss1.str());
gp.append(",");
ss1.clear();
a=a*r;
}
ss2<<a;
gp.append(ss2.str()) ;
return gp;
}
double get_nth_fibonacci_number(size_t n) {
size_t first=0;
size_t second=1;
size_t count = 0;
if(n==0)return first;
else if(n==1) return second;
while(count<n){
int t = second;
second = second+first;
first=t;
count++;
}
return second;
}
int main()
{
cout << "Hello, World!";
// Declarations of the functions in looping_functions.cpp
cout<< "game: "<< play_game(3)<< "\n";
cout << "etox: " << etox( 2, 4)<< "\n";
cout << "size: "<< count_chars("stars",'s')<< "\n";
cout << "GCD..."<< gcd(16 ,2)<< "\n";
cout << "ap_terms: "<< get_ap_terms(1, 3,6)<< "\n";
cout<<"ap_terms: "<< get_gp_terms(4 , 0.5, 6)<< "\n";
cout<< "fib.."<< get_nth_fibonacci_number(6);
return 0;
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cout << "Hello " << name;
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C++ is a widely used middle-level programming language.
When ever you want to perform a set of operations based on a condition If-Else is used.
if(conditional-expression) {
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}
else {
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}
You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to If-Else-If ladder.
switch(conditional-expression){
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For loop is used to iterate a set of statements based on a condition.
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//code
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While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while (condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
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} while (condition);
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
// code
}