VECTOR

 

USING VECTOR CLASS

Note: std::cout, std::cin, std::endl are used to resolve compilation error, you can use cout, cin, endl instead of that.

#include <iostream>
#include <vector>
using namespace std;

void display(vector<int> &v){
	
	std::cout<<"Displaying the vector: ";
	for (int i=0;i< v.size();i++)
	{
		std::cout << v[i] <<"  ";
	// std::cout << v.at(i) <<" ";
	}
	std::cout << "" << std::endl;
}

int main()
{
	std::cout<<std::endl<<"\t\tZero length vector"<<std::endl;
	vector<int> vec1; 
	int element,size=5; 	//cplusplus vector methods
	
	std::cout << "Enter the size of your vector: ";
	std::cin>>size;

	std::cout<<std::endl<<"\t\tpush_back in vector"<<std::endl;
	for(int i=0; i<size; i++)
	{
		std::cout << "Enter an element to add to the vector: ";
		std::cin>>element;
		vec1.push_back(element);
	}

	std::cout << "" << std::endl;
	display(vec1);

	std::cout<<std::endl<<"\t\tpop_back in vector"<<std::endl;
	vec1.pop_back();
	display(vec1);

	std::cout<<std::endl<<"\t\titerator in vector"<<std::endl;
	vector<int> :: iterator iter=vec1.begin();
	vec1.insert(iter, 566); // oth 
	//vec1.insert(iter+1, 566); 1st position
	//vec1.insert(iter+1,5, 566); 5 for copy 5copy
	display(vec1);

	std::cout<<std::endl<<"\t\t4 element int vector"<<std::endl;
	vector<int> vec2(4); 
	//vector<char> vec2(4); //  4 element Char vector
	vec2.push_back(5);
	display(vec2);

	std::cout<<std::endl<<"\t\tvector from vector"<<std::endl;
	vector<int> vec3(vec2); // vector from vec3
	display(vec3);
	
	std::cout<<std::endl<<"\t\trepeat value in vector"<<std::endl;
	vector<int> vec4(6,3); // 6 element vector (repeat, value)
	display(vec4);

	return 0;
}

INPUT / OUTPUT :

		Zero length vector
Enter the size of your vector: 2

		push_back in vector
Enter an element to add to the vector: 1
Enter an element to add to the vector: 2

Displaying the vector: 1  2  

		pop_back in vector
Displaying the vector: 1  

		iterator in vector
Displaying the vector: 566  1  

		4 element int vector
Displaying the vector: 0  0  0  0  5  

		vector from vector
Displaying the vector: 0  0  0  0  5  

		repeat value in vector
Displaying the vector: 3  3  3  3  3  3  

CREATE OWN VECTOR:

Create own vector class to represent the vector (series of float value) include member functions to perform the following:
a) To create the vector
b) To modify the vector of the given element.
c) To multiply by a scalar.
d) Display vector in the form(10, 20, 30, …)

PROGRAM:

#include <iostream>
#include <stdlib.h>

class vector{
	
	int a[3], i;
	public:
	void create(){
	std::cout<<"Enter 3 value into array: "<<std::endl;
	for(i=0;i<3;i++)
	{
		std::cout<<"Enter value: ";
		std::cin>>a[i];
	}
	}
	
	void modify()
	{
		std::cout<<"Do you want to modify the Vector?(Y/N): ";
		char c;
		std::cin>>c;
		if(c=='Y'||c=='y'){
			std::cout<<"Enter the position of the value you want to modify: ";
			int n;
			std::cin>>n;
			std::cout<<"Enter the new value: ";
			int k; std::cin>>k;
			a[n-1]=k;
		}

	}

	void mult()
	{
		std::cout<<"Enter the scalar value: ";
		int s;
		std::cin>>s;
		for(i=0; i<3; i++)
		{
			a[i]=a[i]*s;
		}
	}
	
	void display(void){
		std::cout<<"The vector is: " <<std::endl;
		std::cout<<"( ";
		for(int i=0;i<3;i++){
			if (i<2)
				std::cout<<a[i]<< ", ";
			else	
				std::cout<<a[i];
				}

		std::cout<<" )";
	}

};

int main()
{
	vector v;
	char b;
	int x;
	v.create();
	do{

	std::cout<<std::endl;
	std::cout<<"1. Modify the vector"<<std::endl;
	std::cout<<"2. Multiply the vector"<<std::endl;
	std::cout<<"3. Display the vector"<<std::endl;
	std::cout<<"4. Exit"<<std::endl;
	std::cout<<"Enter your choice: "<<std::endl;
	std::cin>>x;
	switch(x){
	case 1:
		v.modify();
		v.display();
		break;
	case 2:
		v.mult();
	case 3:
		v.display();  break;
	case 4:
		exit(1); 
	default:
		std::cout<<"Invalid Input"<<std::endl;
	}
	std::cout<<std::endl<<"Do you want to continue? (Y/N): "; std::cin>>b;

	}while(b=='y'||b=='Y');

return 0;
}

INPUT / OUTPUT :

Enter 3 value into array: 
Enter value: 1
Enter value: 2
Enter value: 3

1. Modify the vector
2. Multiply the vector
3. Display the vector
4. Exit
Enter your choice: 
3
The vector is: 
( 1, 2, 3 )
Do you want to continue? (Y/N): y

1. Modify the vector
2. Multiply the vector
3. Display the vector
4. Exit
Enter your choice: 
2
Enter the scalar value: 5
The vector is: 
( 5, 10, 15 )
Do you want to continue? (Y/N): y

1. Modify the vector
2. Multiply the vector
3. Display the vector
4. Exit
Enter your choice: 
1
Do you want to modify the Vector?(Y/N): y
Enter the position of the value you want to modify: 2
Enter the new value: 4
The vector is: 
( 5, 4, 15 )
Do you want to continue? (Y/N): n

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