#include <iostream>
#include <fstream>
#include <math.h>
using namespace std;
#define N 35 // The number of values of h
#define PI 3.14159
#define M 600 // The number of samples in t
int main(){
double h[N], t[M], x[M], y[M]; // The arrays for h,t,x,y
double tmax = 0.06, dt = 0.0001; // To find t
// Changes the values of f, a to get different x(t) signals
double f = 2000, a = 100; // The frequency in Hz, amplitude
// Calculates the values of h
h[0] = 361.922; h[34] = h[0];
h[1] = 589.000; h[33] = h[1];
h[2] = 52.556; h[32] = h[2];
h[3] = -538.095; h[31] = h[3];
h[4] = -58.657; h[30] = h[4];
h[5] = 499.472; h[29] = h[5];
h[6] = -251.531; h[28] = h[6];
h[7] = -785.168; h[27] = h[7];
h[8] = 381.999; h[26] = h[8];
h[9] = 812.822; h[25] = h[9];
h[10] = -934.419; h[24] = h[10];
h[11] = -1082.725; h[23] = h[11];
h[12] = 1547.666; h[22] = h[12];
h[13] = 1083.109; h[21] = h[13];
h[14] = -3229.928; h[20] = h[14];
h[15] = -1275.738; h[19] = h[15];
h[16] = 10268.660; h[18] = h[16];
h[17] = 17571.900; h[17] = h[17];
// Calculates the values of t
int j=0;
for(double tt = 0; tt < tmax; tt += dt)
t[j++] = tt;
// Compute x[n]
for(int i=0;i<M;i++)
x[i] = a*sin(2*PI*f*t[i]);
//Storing x[n] to file
ofstream xfile;
xfile.open ("filex.txt");
for(int i=0;i<M;i++)
xfile <<x[i]<<endl;
xfile.close();
//View x[n] in console
for(int i=0;i<M;i++)
cout<<"n = "<<i<<", x= "<<x[i]<<endl;
// Compute y[n]
for(int n = 0; n < M; n++){
double sum = 0;
for(int k = 0; k <= min(N-1,n); k++)
sum += x[n-k] * h[k];
y[n] = sum;
}
// Storing y[n] to file
ofstream yfile;
yfile.open ("filey.txt");
for(int i=0;i<M;i++)
yfile <<y[i]<<endl;
yfile.close();
cout<<"----------------------------------------"<<endl;
//view y[n] in console
for(int i=0;i<M;i++)
cout<<"n = "<<i<<", y= "<<y[i]<<endl;
return 0;
}

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

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
}