Question

Write an assembly language program to input a string from the user. Your program should do these two things:

***** I AM POSTING THIS QUESTION FOR THE THIRD TIME NOW,I WANT IT DONE USING INCLUDE IRVINE32.INC*****

1. count and display the number of words in the user input string.

2. Flip the case of each character from upper to lower or lower to upper.

For example if the user types in:   "Hello thEre. How aRe yOu?"

Your output should be:

The number of words in the input string is: 5

The output string is : hELLO THeRE. hOW ArE YoU?

Answer 1

Ans :

Write an assembly language program to input a string from the user. Your program should do these two things:

1. count and display the number of words in the user input string.

2. Flip the case of each character from upper to lower or lower to upper.

For example if the user types in:   "Hello thEre. How aRe yOu?"

Your output should be:

The number of words in the input string is: 5

The output string is : hELLO THeRE. hOW ArE YoU?

Below is the C Code Program for the above question:

=======================

$ cat string_conversion.c
/*
* C Program to Count Number of Words in a given Text Or Sentence
*/
#include <stdio.h>
#include <string.h>

int main()
{
char s[200];
int count = 0, i;

printf("Enter the String\n");
scanf("%[^\n]s", s);
for (i = 0;s[i] != '\0';i++)
{
if (s[i] == ' ')
count++;
}
printf("Number of Words in Given String are: %d\n", count + 1);

printf("Old String is: %s\n", s);
for(int i=0; s[i]!='\0'; i++)
{

if (s[i]>='a' && s[i]<='z')
{
//Convert lowercase to uppercase
s[i] = s[i] - 32;
}
else if(s[i]>='A' && s[i]<='Z')
{
//Convert uppercase to lowercase
s[i] = s[i] + 32;
}

}
//print the converted string format
printf("New String is %s\n", s);
return 0;
}

==============================================

Write the above C Code in g++ compiler compatible operating systems.

Compile the C Code using g++ command

$ g++ -O string_conversion.c

Above linux command will generate a.out output file. Execute the ./a.out to know the results:

$ ./a.out
Enter the String
Hello thEre. How aRe yOu?
Number of Words in Given String are: 5
Old String is: Hello thEre. How aRe yOu?
New String is hELLO THeRE. hOW ArE YoU?

Convert C Code to Assembly Code using g++ command

$ g++ -S string_conversion.c

this will generate string_conversion.s assembly code and below are the contents

$ cat string_conversion.s

.LC0:

.string "Enter the String"

.LC1:

.string "%[^\n]s"

.LC2:

.string "Number of Words in Given String are: %d\n"

.LC3:

.string "Old String is: %s\n"

.LC4:

.string "New String is %s\n"

main:

push rbp

mov rbp, rsp

sub rsp, 224

mov DWORD PTR [rbp-4], 0

mov edi, OFFSET FLAT:.LC0

call puts

lea rax, [rbp-224]

mov rsi, rax

mov edi, OFFSET FLAT:.LC1

mov eax, 0

call scanf

mov DWORD PTR [rbp-8], 0

.L4:

mov eax, DWORD PTR [rbp-8]

cdqe

movzx eax, BYTE PTR [rbp-224+rax]

test al, al

je .L2

mov eax, DWORD PTR [rbp-8]

cdqe

movzx eax, BYTE PTR [rbp-224+rax]

cmp al, 32

jne .L3

add DWORD PTR [rbp-4], 1

.L3:

add DWORD PTR [rbp-8], 1

jmp .L4

.L2:

mov eax, DWORD PTR [rbp-4]

add eax, 1

mov esi, eax

mov edi, OFFSET FLAT:.LC2

mov eax, 0

call printf

lea rax, [rbp-224]

mov rsi, rax

mov edi, OFFSET FLAT:.LC3

mov eax, 0

call printf

mov DWORD PTR [rbp-12], 0

.L8:

mov eax, DWORD PTR [rbp-12]

cdqe

movzx eax, BYTE PTR [rbp-224+rax]

test al, al

je .L5

mov eax, DWORD PTR [rbp-12]

cdqe

movzx eax, BYTE PTR [rbp-224+rax]

cmp al, 96

jle .L6

mov eax, DWORD PTR [rbp-12]

cdqe

movzx eax, BYTE PTR [rbp-224+rax]

cmp al, 122

jg .L6

mov eax, DWORD PTR [rbp-12]

cdqe

movzx eax, BYTE PTR [rbp-224+rax]

sub eax, 32

mov edx, eax

mov eax, DWORD PTR [rbp-12]

cdqe

mov BYTE PTR [rbp-224+rax], dl

jmp .L7

.L6:

mov eax, DWORD PTR [rbp-12]

cdqe

movzx eax, BYTE PTR [rbp-224+rax]

cmp al, 64

jle .L7

mov eax, DWORD PTR [rbp-12]

cdqe

movzx eax, BYTE PTR [rbp-224+rax]

cmp al, 90

jg .L7

mov eax, DWORD PTR [rbp-12]

cdqe

movzx eax, BYTE PTR [rbp-224+rax]

add eax, 32

mov edx, eax

mov eax, DWORD PTR [rbp-12]

cdqe

mov BYTE PTR [rbp-224+rax], dl

.L7:

add DWORD PTR [rbp-12], 1

jmp .L8

.L5:

lea rax, [rbp-224]

mov rsi, rax

mov edi, OFFSET FLAT:.LC4

mov eax, 0

call printf

mov eax, 0

leave

ret

Write the above Assembly Code Language in 8085/8086 compiler compatible operating systems.

Compile and Execute the Assembly Code Language. Validate and Verify the results (with different input-strings)