Technical Questions

* - any characters, aribitary among

? - single character

User thread

Kernel thread

Static RAM: no refreshing, 6 to 8 MOS transistors are required to form one memory cell, information stored as voltage level in flip flop. 

Dynamic RAM: refreshed periodically, 3 to 4 transistors are required to form one memory cell, information is  stored as a charge in the gate to substrate capacitance.

Flag is a flip-flop used to store the information about the status of a processor and the status of the insturction executed most recently.

A software or hardware mark that signals a particular condition or status. A flag is like a switch that can be either on or off. The flag said to be set when it is turned on.

Yes, single thread module

 #include<stdio.h>
int main(){
  int i=1,f=1,num;

  printf("Enter a number: ");
  scanf("%d",&num);

  while(i<=num){
      f=f*i;
      i++;
  }

  printf("Factorial of %d is: %d",num,f);
  return 0;
}

Sample output:
Enter a number: 5
Factorial of 5 is: 120

We encounter cycle stealing in the context of Direct Memory Access (DMA). Either the DMA controller can use the data bus when the CPU does not need it, or it may force the CPU to temporarily suspend operation. The latter technique is called cycle stealing. Note that cycle stealing can be done only at specific break points in an instruction cycle.

Output: 1 1 1 1 1 1
For loop will execute six times.

Note: continue keyword in do-while loop bring the program its while condition (while(0)) which is always false.