#include <iostream>
using namespace std;


using namespace std;
const int MAX = 100;

struct DONTHUC{
    float heSo;
    int soMu;
};

struct DATHUC{
    int soPhanTu;
    DONTHUC arr[MAX];
};

void NhapDONTHUC(struct DONTHUC &DonThuc){
    cin >> DonThuc.heSo >> DonThuc.soMu;
}

DATHUC* Nhap(){
    DATHUC *DaThuc = new DATHUC;
    cin >> DaThuc->soPhanTu;
    for(int i=0;i<DaThuc->soPhanTu;i++){
        NhapDONTHUC(DaThuc->arr[i]);
    }
    return DaThuc;
}

void Xuat(struct DATHUC p){
    // in don thuc dau tien
    int i=0;
    while(i<p.soPhanTu && p.arr[i].heSo==0) i++;
    if(p.arr[i].heSo==-1) cout << "-";
    if(p.arr[i].heSo!=1 && p.arr[i].heSo!=-1) cout << p.arr[i].heSo;
    if(p.arr[i].soMu!=0 && p.arr[i].soMu!=1) cout << "x^" << p.arr[i].soMu;
    if(p.arr[i].soMu==1) cout << "x";
    // xet cac don thuc kia

    while(i<p.soPhanTu){
        i++;
        //if(p.arr[i].heSo==0) continue;
        if(p.arr[i].heSo > 0) cout << "+";
        if(abs(p.arr[i].heSo)!=1 && p.arr[i].heSo!=0) cout << p.arr[i].heSo;
        else if(p.arr[i].heSo == -1 && i+1>=p.soPhanTu) cout << "-1";
        else if (p.arr[i].heSo == -1 && i+1>=p.soPhanTu) cout << "-1";
        else if (p.arr[i].heSo == -1 && i+1<p.soPhanTu) cout << "-";
        if(p.arr[i].heSo!=0 && p.arr[i].soMu!=1 && p.arr[i].soMu!=0) cout << "x^" << p.arr[i].soMu;
        if(p.arr[i].heSo!=0 && p.arr[i].soMu==1) cout << "x";
    } i++;
}

int main() {
    DATHUC *A, *B;
    A = Nhap();
    B = Nhap();
    cout << "Da thuc A: "; Xuat(*A);
    cout << "\nDa thuc B: "; Xuat(*B);
    return 0;
}
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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
}