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Write a main program that uses these system calls to echo the typed characters. The pseudo code will look something like:
void traphandler () {
if (R0 == 0) { // read system call
R1 = getchar(); // poll the status register of the IO terminal until a char is available then load it into R1
} else if (R0 == 1) { // write system call
putchar(R1); // just store R1 to memory location 0xfff0
}
enableInterrupts();
void main() {
char c;
while (1) {
c = read(); // set R0 to 0 can issue the 'trap' instruction, result will be in R1
write(c); // set R0 to 1 and set R1 to 'c' and issue the 'trap' instruction
Q: What are User Defined data types? C supports an extraordinary feature known as "type definition" that permits users to define an identifier that would represent an existing
There are ''n'' ants on a ''n+1'' length rod. The ants are numbered from 1 to n and are initially placed at positions starting from position 1 till position n. They are moving eith
Introduction to C++ C++ was developed by Bjarne Stroustrup at Bell Laboratories in 1983. Originally, it was known as " C with class". C+ as an enhancement to the C language was
Aim: To implement a program for dynamic data structure(linked list). Code: class node { int data; node *next;
Rule: To determine the canonical form we should OR the min terms. A min term is defined as a Boolean equation of the input if the output is logic '1'. If the input is logic '1'
Define Pure Virtual Function? Why & when it is used?
A: They present a degree of freedom in the interface design options. Member functions & friend functions are equally privileged (100% vested). The major difference is that a fri
how to write
Ask4. Write a query to display the columns listed below. The query should list each customer in which the video rental is overdue. The Days_Overdue column should calculate the numb
A function f is defined by the rule that f(n) = n if 0≤n≤3 and f(n) = f(n - 1) + 2f(n - 2) + 3f(n - 3) if n> 3. (a) Write a procedure that computes f by means of a recursive pro
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