A register is a group of 1- bit memory cells. To make a N-bit register we need N 1-bit memory cells. Register with parallel load: We can represent a simple 4-bit register as: We can give the values to be stored at input and we get that value stored at the next clock pulse. But […]
Tag: memory
Flip flop = 1 bit Memory
1-bit Memory Cell: We know that flip-flop can store either zero or one permanently until a change is made in the inputs. Hence flip-flop would work as 1-bit memory cell.
Frame Pointer
Q- How are variables accessed within a frame in the stack? Ans: Well as there is a pointer known as stack pointer to manage different operations on stack, the same way there is a frame pointer to access different variables with a frame. The stack pointer points to the top of the stack while the […]
Q5: Memory allocation
As address of the variable y is returned and which gets stored in x and the memory block of function abc() is de-allocated. Next we try to store a value in the memory which has been de-allocated. As memory has been de-allocated and hence operating system may have allocated this memory to some other process. […]
Q4: Memory Allocation
What is the output of the following code? (a) 3 (b) 5 (c) Can’t say Ans: Many would answer it as 3 but it is wrong. The way we have tried to do it is wrong. As we enter into main we have a memory allocated for variable x and then function abc is called. Now […]
Q3: Memory allocation
Consider the C code Explain the allocation of memory in stack for the above program. Ans: firstly a frame in stack is created and memory is allocated to store variable x with value 3. And then function call is made to function fun() and a new frame is created in the stack. Firstly return address to […]
Q2: Memory Allocation
Consider the C code: Now we have to picturize the whole scenario in HEAP and STACK memory. Ans: We have no dynamically allocated variables in this program. Hence there is not much role of HEAP memory. We analyze the memory allocation and de-allocation in STACK on next page. We know stack memory is used to […]
Q1: Memory allocation
Now we have the following statements and we see how STACK & HEAP memory is allocated to different variables. We have the empty HEAP memory & STACK memory as: NOTE: For this question we have used a heap memory & allocated space serially while in real, memory is allocated randomly by operating system. char* x; x= […]
Processor Memory
A Computer system can be classified into following groups: Internal memory Primary memory Secondary memory INTERNAL MEMORY refers to the registers of CPU which hold temporary results. These registers are very fast. PRIMARY MEMORY is the storage area where all the programs are executed. The CPU can directly access only those items that are stored in primary […]