The assignment is to read in the source code of a C++ program (two are provided)

Question

The assignment is to read in the source code of a C++ program (two are provided) and find all of the assignment statements '='. From each of these you should extract the variable to the left of the = operator and all of the variables in the expression on the right-hand side. You may assume that no variable contains an embedded blank and that each statement is on a line by itself.

Input

1. From the user (keyboard): the name of the input file to process.

2. From the input file: a syntactically correct C++ program.

Output

Print out each assignment statement, and next to it the variables that you have extracted. The labeled output should be printed to a file called "Parse_out.txt".

Sample Output:

ASSIGNMENT STATEMENTS LEFT RIGHT

one = data; one data

x = 5.6; x

test = sqrt(x + 5.4) + one/x; test x, one, x

x = rec + num * (age - 10); x rec, num, age

Deliverables

1. A list of your program..

2. Parse_out.txt

Explanation / Answer

Parsing variables:

string S=" S1="one", S2="data", s3,s4;  
cout<<S<<endl;
cout<<left;
cout<<setw(40)<<S1;
cout<<right;
cout<<setw(40)<<S2<<endl;

S="x = 5.6";
cout<<S<<endl;
S1="x";
cout<<left;
cout<<setw(40)<<S1;
cout<<right;
cout<<setw(40)<<endl;

S="test = sqrt(x + 5.4) + one/x";
cout<<S<<endl;
S1="test",S2="x";S3="one";
cout<<left;
cout<<setw(40)<<S1;
cout<<right;
cout<<setw(40)<<S2<<","<<S3<<","<<S2<<endl;

S="x = rec + num * (age - 10)";
cout<<S<<endl;
S1="x",S2="rec",S3="num";S4="age";
cout<<left;
cout<<setw(40)<<S1;
cout<<right;
cout<<setw(40)<<S2<<","<<S3<<","<<S4<<endl;    

______________________________________________________________________

//To output

ifstream In;

In.open("Parse_out.txt");

In>>one>>data;

ofstream Out("Parse_out.txt");

out.close();

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