C++ Interpreter

Design and implement an interpreter in C++ that executes the code written in LAO language (the name of our own programming language). The statements in LAO language are:

• ::= REM | REM
• ::= =
• ::= PRINT | PRINT | PRINT | PRINT
• ::= READ
• ::= IF THEN
• ::= END.

Where:

::= |

::= a-z | A-Z

::= |

::= | < unsign integer>

::= |

::= |

::=

::= .

::=

::= e | E

::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

::= + | -

::= "" | ""

::=

::= .gt. | .lt. | .eq. | .ge. | .le. | .ne.

::= .or. | .and. | .not.

::= | |

CAN PLEASE FIX IT

#include

#include

using namespace std;

void stringI(int j)

{

if(j+1)

{

cout<<"string";

}else

cout<< "Invalid input"<

}

void statement(int input)

{

switch(input)

{

case 0:

cout<<"command statement"<

break;

case 1:

cout<<"if statement"<

break;

case 2:

cout<<"then statement"<

break;

case 3:

exit;

break;

case 4:

cout<<"read statement"<

break;

case 5:

cout<<"print statement"<

break;

default:"Invalid input";

}

}

int main()

{

char input[]="";

string keyword[]={"REM","IF","THEN","END.","READ","PRINT"};

/*char lLetter[]={"a","b","c","d","e","f","g","h","i","j",

"k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"};

char uLetter[]={"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O",

"P","Q","R","S","T","U","V","W","X","Y","Z"};*/

cout<<"Enter:";

cin>>input;

int size=sizeof(input);

for(int i=0;i<5;i++)

{

if(input==keyword[i])

{

statement(i);

}

}

if(input[0]== *("\"") && input[size-1]==*("\""))

{

cout<<"string";

}

return 0;

}