AREA	ProperCase, CODE, READONLY
	IMPORT	main
	EXPORT	start

start
	LDR	R1, =testStr ;
	LDRB R2, [R1] 	; store first letter
	CMP R2, #'a'		; compare to lower case letter a to understand whether it is capital or lower case
	BLO endwhFirstLetter
checkFirstLetter
	CMP R2, #'Z'
	BHI firstLetter
	B endwhFirstLetter
firstLetter
	SUB R2, R2, #0x20;
	STRB R2, [R1]	;
endwhFirstLetter
	ADD R1, R1, #1	;
	LDRB R2, [R1]	;
	CMP R2, #0x0	; compare for null char,
	BEQ endLoop	; if null reached end loop
	CMP R2, #' '	;
	BEQ firstLetterAdd ;
	CMP R2, #'Z'	; to check if it is lowercase already
	BHI endwhFirstLetter
	CMP R2, #'a' 	;
	BLO	lowercaseLetter
lowercaseLetter
	LDRB R2, [R1] 	; store next letter
	ADD R2, R2, #0x20	;
	STRB R2, [R1]		;
	B endwhFirstLetter
firstLetterAdd
	ADD R1, R1, #1	;
	LDRB R2, [R1] 	;
	B checkFirstLetter
endLoop

stop	B	stop

	AREA	TestData, DATA, READWRITE

testStr	DCB	"hello WORLD", 0

	END