Day: September 20, 2015

Arrays Introduction

Problem Statement

An array is a series of elements of the same type placed in contiguous memory locations that can be individually referenced by adding an index to a unique identifier.

Declaration:Movie Fifty Shades Darker (2017)

int arr[10]; //Declares an array named arr of size 10, i.e; you can store 10  integers.

Accessing elements of an array:

Indexing in arrays starts from 0.So the first element is stored at arr[0],the second element at arr[1]...arr[9]

You’ll be an given array of N integers and you have to print the integers in the reverse order.

Input Format

The first line of the input contains N,where N is the number of integers.The next line contains N integers separated by a space.

Constraints

1<=N<=1000

1<=Ai<=10000, where Ai is the ith integer in the array.

Output Format

Print the N integers of the array in the reverse order in a single line separated by a space.

Sample Input

4
1 4 3 2

Sample Output

2 3 4 1

Solution

  
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n,i,a[max];
    cin>>n;
    for(i=0;i<n;i++)
        cin>>a[i];
    for(i=n-1;i>=0;i--)
        cout<<a[i]<<" ";
    return 0;
}

Input and Output

Problem Statement

For any program that we write the basic things that we need to do is take the input and print the expected output.

In C++ you can take the input using cin and print the output using cout.Unlike C where you need the format specifier in printf and scanf, here you can use cin and cout.

Taking Input:

If you want to input a number: cin>>n ,  where n is the number.
If you want to input a number and a string: cin>>n>>s, where s is the string.

Printing output:

If you want to output a single number: cout<<n
If you want to output a number and a string separated by a new line: cout<<n<<endl<<s (where endl moves the pinter to the new line and then string gets printed.)

Take three numbers as inputs and print the sum of the three numbers.

Input Format

The first line of the input contains three integers A,B and C.

1≤A,B,C≤1000

Output Format

In a single line print the sum of the three numbers.

Sample Input

1 2 7

Sample Output

10

Explanation

Sum of the three numbers 1,2 and 7 is 10.

Solution

  
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    int a,b,c;
    cin>>a>>b>>c;
    cout<<a+b+c;
    return 0;
}