#include<iostream>
#include<stdio.h>
#include<math.h>
#include<sys/time.h>
#include<fstream>
#include<string.h>
	
using namespace std;
int LinearSearch(int arr[], int n, int x);
int BinarySearch(int arr[], int l, int r, int x);
int main()
{

	long timedif;
	struct timeval tpstart;
	struct timeval tpend;
	struct timeval now;
	int i;
	int A[100],B[1000],C[10000];
	long double hun,tho,tent,result[2][3];

    ifstream inFile;
    inFile.open("data.txt",ios::in);
    for (i = 0; i < 100; i++) 
    inFile >> A[i];
    for (i = 0; i < 1000; i++) 
    inFile >> B[i];
    for (i = 0; i < 10000; i++) 
    inFile >> C[i];
    inFile.close(); 
   

    //			LINEAR SEARCH ANALYSIS
	now.tv_sec=000000000;
	now.tv_usec=000000;
	gettimeofday(&tpstart, NULL);
	LinearSearch(A,100,7);
	gettimeofday(&tpend, NULL);
	hun = 1000000 * (tpend.tv_sec - tpstart.tv_sec) + tpend.tv_usec - tpstart.tv_usec;
	
	now.tv_sec=000000000;
	now.tv_usec=000000;
	gettimeofday(&tpstart, NULL);
	LinearSearch(B,1000,7);
	gettimeofday(&tpend, NULL);
	tho = 1000000 * (tpend.tv_sec - tpstart.tv_sec) + tpend.tv_usec - tpstart.tv_usec;
	
	now.tv_sec=000000000;
	now.tv_usec=000000;
	gettimeofday(&tpstart, NULL);
	LinearSearch(C,10000,7);
	gettimeofday(&tpend, NULL);
	tent = 1000000 * (tpend.tv_sec - tpstart.tv_sec) + tpend.tv_usec - tpstart.tv_usec;
	result[0][0]=hun;
	result[0][1]=tho;
	result[0][2]=tent;
	
	cout<<"LINEAR SEARCH "<<result[0][0]<<" "<<result[0][1]<<" "<<result[0][2]<<endl;
	
	//			BINARY SEARCH ANALYSIS
	now.tv_sec=000000000;
	now.tv_usec=000000;
	gettimeofday(&tpstart, NULL);
	BinarySearch(A,0,100,7);
	gettimeofday(&tpend, NULL);
	hun = 1000000 * (tpend.tv_sec - tpstart.tv_sec) + tpend.tv_usec - tpstart.tv_usec;
	
	now.tv_sec=000000000;
	now.tv_usec=000000;
	gettimeofday(&tpstart, NULL);
	BinarySearch(B,0,1000,7);
	gettimeofday(&tpend, NULL);
	tho = 1000000 * (tpend.tv_sec - tpstart.tv_sec) + tpend.tv_usec - tpstart.tv_usec;
	
	now.tv_sec=000000000;
	now.tv_usec=000000;
	gettimeofday(&tpstart, NULL);
	BinarySearch(C,0,10000,7);
	gettimeofday(&tpend, NULL);
	tent = 1000000 * (tpend.tv_sec - tpstart.tv_sec) + tpend.tv_usec - tpstart.tv_usec;
	result[1][0]=hun;
	result[1][1]=tho;
	result[1][2]=tent;
	
	cout<<"BINARY SEARCH "<<result[1][0]<<" "<<result[1][1]<<" "<<result[1][2]<<endl;

}

int LinearSearch(int arr[], int n, int x)
{
    int i;
    for (i = 0; i < n; i++)
        if (arr[i] == x)
            return i;
    return -1;
}

int BinarySearch(int arr[], int l, int r, int x)
{
    if (r >= l) {
        int mid = l + (r - l) / 2;
  
        if (arr[mid] == x)
            return mid;
  
        if (arr[mid] > x)
            return BinarySearch(arr, l, mid - 1, x);
  
        return BinarySearch(arr, mid + 1, r, x);
    }
    return -1;
}

C++ Online Compiler

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Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

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

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

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.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

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 
}

5. Do-While:

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 {  
 // code 
} while (condition);

Functions

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.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}