How a program is executed?

The CPU executes a program that is stored as a sequence of machine language instructions in main memory. It does this by repeatedly reading, or fetching, an instruction from memory and then carrying out, or executing, that instruction. … The PC stores the address of the next instruction that the CPU should execute.

How is a program executed in the CPU?

How Does a Program Run? The CPU runs instructions using a «fetch-execute» cycle: the CPU gets the first instruction in the sequence, executes it (adding two numbers or whatever), then fetches the next instruction and executes it, and so on.

What is execution of a program?

Execution in computer and software engineering is the process by which a computer or virtual machine reads and acts on the instructions of a computer program. … Programs for a computer may be executed in a batch process without human interaction or a user may type commands in an interactive session of an interpreter.

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What happens when a program is executed?

Once the program begins execution it is entirely copied to the RAM. Then the processor retrive a few instructions (it depends on the size of the bus) at a time, puts them in registers and executes them.

How a program is executed in a computer explain it with an example?

Programs are stored on secondary storage devices such as hard disks. When you install a program on your computer, the program is actually copied to your hard disk. But when you execute a program, the program is copied (loaded) from your hard disk to the main memory, and that copy of the program is executed.

What is a running program called?

An executable is a file that contains a program — that is, a particular kind of file that is capable of being executed or run as a program in the computer. In a Disk Operating System or Windows operating system, an executable file usually has a file name extension of . bat, .com, or .exe.

Does a compiler execute a program?

A compiler takes the program code (source code) and converts the source code to a machine language module (called an object file). … So, for a compiled language the conversion from source code to machine executable code takes place before the program is run.

Is a program in execution in memory?

When the CPU executes a program, that program is stored in the computer’s main memory (also called the RAM or random access memory). … The CPU executes a program that is stored as a sequence of machine language instructions in main memory.

What are steps for execution of a complete instruction?


  1. Six steps are involved in execution of an instruction by OS :-
  2. Step 1: Fetch instruction.
  3. Step 2: Decode instruction.
  4. Step 3: Perform ALU operation.
  5. Step 4: Access memory.
  6. Step 5: Update Register File.
  7. Step 6: Update the PC (Program Counter)
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What is required in each C program?

3) What is required in each C program? The program must have at least one function. The program does not require any function.

What happens when you run a program under an OS?

Once you run a program, the operating system allocates a runtime process for the program to utilize. This process helps allocate memory for the program, setup any resources that are needed, and begin execution of the program on the CPU using a thread. … Once a program is finished, the opposite happens.

Where does the execution of the program starts?

The main function serves as the starting point for program execution. It usually controls program execution by directing the calls to other functions in the program. A program usually stops executing at the end of main, although it can terminate at other points in the program for a variety of reasons.

What does a program counter contain?

A program counter is a register in a computer processor that contains the address (location) of the instruction being executed at the current time. As each instruction gets fetched, the program counter increases its stored value by 1.

What is the difference between hardware and software?

A computer system is divided into two categories: Hardware and Software. Hardware refers to the physical and visible components of the system such as a monitor, CPU, keyboard and mouse. Software, on the other hand, refers to a set of instructions which enable the hardware to perform a specific set of tasks.

What are examples of computer programs?

Five Computer Programs We Use Every Day

  • Microsoft Windows. While not strictly a computer program (it’s what is known as an operating system), Windows is likely to be the face that greets you every day as you turn on your PC. …
  • Microsoft Internet Explorer. …
  • Microsoft Office and Outlook. …
  • McAfee Antivirus. …
  • Adobe PDF.
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