Can you give me the output of this code? //C file #include #include #include #in

ID: 3721973 • Letter: C

Question

Can you give me the output of this code?

//C file

#include

// struct to be returned

struct Token{

char token[26];

char lexeme[26];

bool closed;

};

struct Token nextToken(FILE *fp) {

// Empty struct that will be used to reset the returnedToken

static const struct Token Empty;

struct Token returnedTOKEN;

// Variables that will hold the cases,

// some variables will hold numbers and some char arrays

int state = 1;

int numBuffer = 0;

char alphaBuffer[20];

alphaBuffer[0] = '';

char ch;

// Getting a single char from the stream

ch = fgetc(fp);

bool skipped = false;

while (true) {

if (ch == EOF && !skipped) { // EOF

skipped = true;

}

else if (skipped) {

// EOF was reached

// setting the boolean variable in the struct to true

// and closing the stream

fclose(fp);

returnedTOKEN = Empty;

returnedTOKEN.closed = true;

return returnedTOKEN;

}

switch (state) {

// Finding single tokens or spaces.

case 1:

switch (ch) {

case '(':

returnedTOKEN = Empty;

strcpy(returnedTOKEN.token, "LP");

strcpy(returnedTOKEN.lexeme, "(");

return returnedTOKEN;

case ')':

returnedTOKEN = Empty;

strcpy(returnedTOKEN.token, "RP");

strcpy(returnedTOKEN.lexeme, ")");

return returnedTOKEN;

case '{':

returnedTOKEN = Empty;

strcpy(returnedTOKEN.token, "LB");

strcpy(returnedTOKEN.lexeme, "{");

return returnedTOKEN;

case '}':

returnedTOKEN = Empty;

strcpy(returnedTOKEN.token, "RB");

strcpy(returnedTOKEN.lexeme, "}");

return returnedTOKEN;

case ' ':

case '':

case ' ':

ch = fgetc(fp); // spaces can be ignored

continue;

case ';':

returnedTOKEN = Empty;

strcpy(returnedTOKEN.token, "semicolon");

strcpy(returnedTOKEN.lexeme, ";");

return returnedTOKEN;

case '+':

returnedTOKEN = Empty;

strcpy(returnedTOKEN.token, "add_operator");

strcpy(returnedTOKEN.lexeme, "+");

return returnedTOKEN;

case '=':

ch = fgetc(fp);

state = 6;

continue;

case '-':

ch = fgetc(fp);

state = 7;

continue;

case '~':

ch = fgetc(fp);

state = 9;

continue;

case '<':

ch = fgetc(fp);

state = 10;

continue;

case '>':

ch = fgetc(fp);

state = 11;

continue;

case '*':

returnedTOKEN = Empty;

strcpy(returnedTOKEN.token, "mul_operator");

strcpy(returnedTOKEN.lexeme, "*");

return returnedTOKEN;

case '/':

returnedTOKEN = Empty;

strcpy(returnedTOKEN.token, "div_operator");

strcpy(returnedTOKEN.lexeme, "/");

return returnedTOKEN;

default:

state = 2;

continue;

}

// The case for when a number is scanned

case 2:

if (isdigit(ch)) {

numBuffer = 0;

numBuffer += (ch-'0');

state = 3;

ch = fgetc(fp);

}

else {

state = 4;

}

continue;

// Number is found

case 3:

if (isdigit(ch)) {

numBuffer *= 10;

numBuffer += (ch - '0');

ch = fgetc(fp);

}

else{

returnedTOKEN = Empty;

strcpy(returnedTOKEN.token, "literal_integer");

// integer to char

sprintf(returnedTOKEN.lexeme, "%d", numBuffer);

return returnedTOKEN;

}

continue;

// A Letter/invalid character has been identified

case 4:

// Clearing the array

memset(&alphaBuffer[0], 0, sizeof(alphaBuffer));

if (isalpha(ch) || ch == '_') {

strncat(alphaBuffer, &ch,1);

state = 5;

ch = fgetc(fp);

}

else {

strncat(alphaBuffer, &ch, 1);

returnedTOKEN = Empty;

strcpy(returnedTOKEN.token, "Invalid:");

strcpy(returnedTOKEN.lexeme, alphaBuffer);

return returnedTOKEN;

}

continue;

// Keyword is found or a variable

case 5:

if (isalpha(ch) || isdigit(ch) || ch == '_') {

strncat(alphaBuffer, &ch, 1);

ch = fgetc(fp);

}

else {

// The ID/Keyword has been identified

// We need to put the last character taken

// back in the stream

// and reset the state

state = 1;

ungetc(ch, fp);

// Reassignnig the token to be return

// Just in case that it contains unwanted token/lexeme

returnedTOKEN = Empty;

if (strcmp(alphaBuffer, "int") == 0) {