A

/*-----------------Students write their subroutine here--------------------*/
PUSH {LR};

LDR R0,=WelcomeString; //Print welcome msg
BL printf;
BL cr;

LDR R0,= Prompt;       //prepare inital size prompt

prompt:
BL printf;             //print prompt
BL cr;

BL getstring;

PUSH {R0}
BL value;              //print value
BL cr;
POP {R0};

CMP R0, 0x3;           //test for val<3, load prompt and branch if invalid
ITT LT;
LDRLT R0,= Prompt3;
BLT prompt;

CMP R0,10;             //test for val>10, load prompt and branch if invalid
ITT GT;
LDRGT R0,= Prompt4;
BGT prompt;

STR R0, [SP, 4];         //store size on stack
.equ outAdd, 0x20001000; //output array address
LDR R1,= outAdd;
PUSH {R0-R1};             //this is just moving size and address over
POP {R1-R2};              //so R0 is unnocupied / unneccessary

loop:
LDR R0,= Prompt1;         //start of the loop loads main prompt
CMP R1, 0x1;              //or prompt for last input
IT EQ;
LDREQ R0,= Prompt2;
PUSH {R1-R2};

keyPrompt:          //seperate branch so I can print without loading original prompts
BL printf;          //print prompt
BL cr;
BL getstring;

PUSH {R0};
BL value;           //print value
BL cr;
POP {R0};

CMP R0, 0x0;        //checks for negative value
IT LT;              //loads invalid prompt and branches back if invalid
LDRLT R0,= Prompt5;
BLT keyPrompt;

POP {R1-R2};        //output value to array
STR R0, [R2], 0x4;

SUB R1, 0x1;        //subtract from size, check if all inputs have been grabbed
CMP R1, 0x0;
BNE loop;

POP {LR};
BX LR;
/*-------Code ends here ---------------------*/