Data Structure in C++

A simple register machine,

Output I need:

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1. Note that your version will allow the use of any string as a register name, and will create new registers as required (or just crash if you request the value of a nonexistent register).

2. All the arithmetic/comparison commands should be able to take either a number or a register name as their first two arguments. e.g., the following are all valid commands:

add 1 2 a add a 2 b add 2 b c add b c d

3. Please add the required comments before classes and methods (as described in the coding standard).

Please fix the above problems.

This is my code below, but I need to fix the above problems(1, 2, 3).

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#include #include #include #include

// std::vector regval[4]; // 0:a, 1:b , 2:c, 3:d

class command { public: std::map rmap; void store(int val, string reg){ rmap[reg] = val; }

void print(string reg){ std::cout

void add(string r1, string r2, string result){ rmap[result] = rmap[r1] + rmap[r2]; }

void sub(string r1, string r2, string result){ rmap[result] = rmap[r1] - rmap[r2]; }

void mul(string r1, string r2, string result){ rmap[result] = (rmap[r1]) * (rmap[r2]); }

void cmp(string r1, string r2, string result){ if((rmap[r1] ) == (rmap[r2])){ rmap[result] = 0; } if((rmap[r1] ) > (rmap[r2])){ rmap[result] = 1; } if((rmap[r1] )

};

int main(){ using std::cin; using std::cout; using std::endl; string line; command execute = command(); while(true){ cout "; getline(cin,line); string word; // Have a buffer string std::stringstream ss(line); // Insert the string into a stream vector words; // Create vector to hold our words while (ss >> word) words.push_back(word);

if(words[0] == "store"){ int val = atoi(words[1].c_str()); // Change string into int execute.store(val, words[2]); }

else if(words[0] == "print"){ execute.print(words[1]); }

else if(words[0] == "add"){ execute.add(words[1], words[2], words[3]); }

else if(words[0] == "sub"){ execute.sub(words[1], words[2], words[3]); }

else if(words[0] == "mul"){ execute.mul(words[1], words[2], words[3]); }

else if(words[0] == "cmp"){ execute.cmp(words[1], words[2], words[3]); }

else if(words[0] == "stop"){ return 0; }

else{ cout store 1 a store 2 b print a print b add a b c print c comp a b d No command with that name exists cmp a b d print d stop Command Description store x r Store x into register r(a. b. c or d) print. r Print the value in register r add x y d Addxand yand store the result in d (xand ymay be either, but d must be a register) sub x y d Subtract y from Xand store the result in d mul x y d Multiply x and yand store the result in d Compare xand vand store into d cmp x y d b O if they are equal, -1 if a b. or 1 if a Note that the arithmetic add. sub mul) and comparison (cmp) commands can take either values or register names as their first two parameters. E.g., the following are all valid commands: add 1 2 a add a 2 b add 1 b c add b c d You may assume that command names and arguments are always separated by at least one space character. You should bear in mind that we might want to add new commands later on. so think about how to make your program easily extensible in that way (e.g., a huge if-else chain is not very extensible)