Siddhartha Mahapatra

If you are using UNIX based system, you can use terminal commands with the help of the system() function. Try the below code example: #include "iostream" using namespace std; int main() { system("ls -lrt"); return 0; } system() in C/C++ system() is used to invoke an operating system command from a C/C++ program. int system(const char *command); Note: stdlib.h or cstdlib needs to be included to call system. Using system(), we can execute any command that can run on terminal if operating system allows. For example, we can call system(“dir”) on Windows and system(“ls”) to list contents of a directory. Writing a C/C++ program that compiles and runs other program? We can invoke gcc from our program using system(). See below code written for Linux. We can easily change code to run on windows. // A C++ program that compiles and runs another C++ // program #include "bits/stdc++.h" using namespace std; int main () { char filename[100]; cout << "Enter file name to compile "; cin.getline(filename, 100); // Build command to execute. For example if the input // file name is a.cpp, then str holds "gcc -o a.out a.cpp" // Here -o is used to specify executable file name string str = "gcc "; str = str + " -o a.out " + filename; // Convert string to const char * as system requires // parameter of type const char * const char *command = str.c_str(); cout << "Compiling file using " << command << endl; system(command); cout << "\nRunning file "; system("./a.out"); return 0; } Thanks.

How do I get different compilers for different languages like C, CPP, Java, and Python in a single desktop application or website like Hacker Rank?

The desktop application you are talking about has a name, and it is called as an ‘IDE’ (Integrated Development Environment). This an application or a software that acts similar as text editors like sublime and atom. These IDE’s contain advanced options than a simple text editor such as debugger,syntax highlighter and many more. There are many IDE’s out there in the market.Among them some of my favorite are Eclipse,Netbeans and Codeblocks. It is better to try each of them and find the one that best suits you. Happy Coding :)

A simple priority queue will do the job. You can define each node in the queue to hold the task as well as the priority level. Enqueueing will be no different that regular queues and will happen at the rear. Dequeueing however, will not always take place at the front but will rather happen to the node with least priority level in the queue, regardless of location. Have a look at priority queues, learn what they are and have fun implementing them. I assure you, it’s easy to do and you learn a lot! Round Robin Scheduling Each process is provided a fix time to execute called quantum. Once a process is executed for given time period. Process is preempted and other process executes for given time period. Context switching is used to save states of preempted processes. See below attached image1 for your reference. CODE: #include "stdio.h" main() { int n; printf("Enter the no. of processes: "); scanf("%d",&n); int id[n],bt[n],rt[n],wt[n],tat[n],st[n],ft[n],q,i,time=0,btsum=0; for(i=0;iq) { time+=q; bt[i]-=q; wt[i]=wt[i]+st[i]-ft[i]; ft[i]=time; } else if(bt[i]<=q && bt[i]!=0) { time+=bt[i]; wt[i]=wt[i]+st[i]-ft[i]; bt[i]=0; } } for(i=0;i

The C Program is written for implementation of STACK using Array, the basic operations of stack are PUSH(), POP() and DISPLAY(). PUSH function in the code is used to insert an element to the top of stack, POP function used to remove the element from the top of stack. Finally display function used to print the values at any time. All stack functions are implemented in C Code. The same implementation of stack using c is written using pointers: Stack operations using pointers in c //stack using array #include "stdio.h" #include "conio.h" int stack[100],choice,n,top,x,i; void push(); void pop(); void display(); void main() { //clrscr(); top=-1; printf("\n Enter the size of STACK[MAX=100]:"); scanf("%d",&n); printf("\n\t STACK OPERATIONS USING ARRAY"); printf("\n\t--------------------------------"); printf("\n\t 1.PUSH\n\t 2.POP\n\t 3.DISPLAY\n\t 4.EXIT"); do { printf("\n Enter the Choice:"); scanf("%d",&choice); switch(choice) { case 1: { push(); break; } case 2: { pop(); break; } case 3: { display(); break; } case 4: { printf("\n\t EXIT POINT "); break; } default: { printf ("\n\t Please Enter a Valid Choice(1/2/3/4)"); } getch(); } } while(choice!=4); } void push() { if(top>=n-1) { printf("\n\tSTACK is over flow"); getch(); } else { printf(" Enter a value to be pushed:"); scanf("%d",&x); top++; stack[top]=x; } } void pop() { if(top<=-1) { printf("\n\t Stack is under flow"); } else { printf("\n\t The popped elements is %d",stack[top]); top--; } } void display() { if(top>=0) { printf("\n The elements in STACK \n"); for(i=top; i>=0; i--) printf("\n%d",stack[i]); printf("\n Press Next Choice"); } else { printf("\n The STACK is empty"); } } OUTPUT: Enter the size of STACK[MAX=100]:10 STACK OPERATIONS USING ARRAY -------------------------------- 1.PUSH 2.POP 3.DISPLAY 4.EXIT Enter the Choice:1 Enter a value to be pushed:12 Enter the Choice:1 Enter a value to be pushed:24 Enter the Choice:1 Enter a value to be pushed:98 Enter the Choice:3 The elements in STACK 98 24 12 Press Next Choice Enter the Choice:2 The popped elements is 98 Enter the Choice:3 The elements in STACK 24 12 Press Next Choice Enter the Choice:4 EXIT POINT

Constructor: A constructor is a special member function used in a class in order to Initialize the objects of a class. The name of the constructor should be same as that of the class name. Constructors does not have any return type not even void In Object oriented programming we have 3 types of constructors they are: 1. default constructor: The constructor which does not have any arguments are known as default constructors. Syntax: Class_name() { --------------//arguments } 2. parameterized constructor: The constructors which passes arguments is known as a parameterized constructor. Syntax: Class_name(parameters) { -------------------//arguments } 3. copy constructor: The constructor which creates an object by initializing it with an object of the same class which was created prior is known as a copy constructor. Now let us see a program to generate a Fibonacci serious using constructor to in Action l an object. #include "iostream" using namespace std; class fib //class declaration { int n; public: //access specifier fib() //default constructor { cout<<"enter the number until which you want the fibonacci series to come"<>n; } int fib_op(int x) // function declaration and definition { if(x==0) return 0; else if(x==1) return 1; else return(fib_op(x-1)+fib_op(x-2)); } void display() //function to display the output { for(int i=0;i<=n;i++) { cout<