Write the assembly code in AT&T syntax for digits.c and height.c intended for people to be able to read it, not in assembly compiled and generated by a machine.

Question

Write the assembly code in AT&T syntax for digits.c and height.c intended for people to be able to read it, not in assembly compiled and generated by a machine. They are both in C. Write the assembly code for both as separate assignments.

Code:

digits.c

#include

//Global input variable

int input = 247; // 0<=input<1000

//Global output variable declarations

int ones = 0;

int tens = 0;

int hundreds = 0;

int main(){

int temp = input;

ones = temp%10;

temp /= 10;

tens = temp%10;

temp /= 10;

hundreds = temp;

printf("Input: %d\n",input);

printf("Ones: %d\n",ones);

printf("Tens: %d\n",tens);

printf("Hundreds: %d\n",hundreds);

}

height.c

#include

#include

#define g 9.8

//Global input variable

double velocity = 24.7; // unit: m/s

//Global output variable declarations

double height;

int main(){

//Formula used: height = (1/2) * (((velocity)^2)/g)

height = (1.0/2) * ((pow(velocity,2))/g);

printf("Initial Velocity: %lf m/s\n",velocity);

printf("Height: %lf m\n",height);

}

Answer 1

I hope you'll forgive me for posting this without actually assembling and testing it, but it should serve, at least, as an example of a solution. Here's digits.c in 32-bit X86 as assembler:

# digits.c

#

# #include <stdio.h>

.extern _printf

.data

# //Global input variable

# int input = 247; // 0<=input<1000

input: .word $247

# //Global output variable declarations

# int ones = 0;

ones: .word $0

# int tens = 0;

tens: .word $0

# int hundreds = 0;

hundreds:

.word $0

# int main() {

.text

.global _start:

pushl %ebp

movl %esp, %esp

# int temp = input;

movl input, %eax

# ones = temp%10;

# temp /= 10;

div $10

movl %edx, ones

# tens = temp%10;

# temp /= 10;

div $10

movl %edx, tens

# hundreds = temp;

movl %eax, hundreds

# printf("Input: %d\n",input);

.data

MsgInput:

.ascii "Input: %d\n", 0

.text

pushl input

pushl $MsgInput

call _printf

addl $8, %esp

# printf("Ones: %d\n",ones);

.data

MsgOnes:

.ascii "Ones: %d\n", 0

.text

pushl ones

pushl $MsgOnes

call _printf

addl $8, %esp

# printf("Tens: %d\n",tens);

.data

MsgTens:

.ascii "Tens: %d\n", 0

.text

pushl tens

pushl $MsgTens

call _printf

addl $8, %esp

# printf("Hundreds: %d\n",hundreds);

.data

MsgHundreds:

.ascii "Hundreds: %d\n", 0

.text

pushl hundreds

pushl $MsgHundreds

call _printf

addl $8, %esp

movl %ebp, %esp

popl %ebp

ret

# }