In this lab, we will develop a small utility program that can fix indentation in C or C++ source code files. It will have some limitations, but it will be able to cover a significant subset of valid C++ programs. Specifically, given a file with messed up indentation style:

 int main(){ // Hi, I'm a program! int x = 1; for(int i = 0; i < 10; i++) { cout << i; cout << endl; } } 

It will output a well-formatted program:

int main(){ // Hi, I'm a program! int x = 1; for(int i = 0; i < 10; i++) { cout << i; cout << endl; } } 

Task A. Removing indentation

Before we make a program that indents source code files, lets make a program that unindents them.

Start by writing a function

string removeLeadingSpaces(string line); 

that takes one line of code as input and returns its copy without leading spaces and tabs:

removeLeadingSpaces(" int x = 1; ") == "int x = 1; " 

Make use of the function isspace defined in to check if a character is a whitespace. Your function should probably iterate over the input string, skip all spaces, and after it finds the first non-space character, start accumulating the characters into a new string, which will be returned.

Write a program unindent.cpp that reads input from cin and prints out each input line with leading spaces removed.

Example:

To test, create a badly indented file, for instance, called bad-code.cpp:

 int main(){ // Hi, I'm a program! int x = 1; for(int i = 0; i < 10; i++) { cout << i; cout << endl; } } 

Since our unindent program reads its input from cin, the badly indented text can be fed into it using standard input redirection:

$ ./unindent < bad-code.cpp int main(){ // Hi, I'm a program! int x = 1; for(int i = 0; i < 10; i++) { cout << i; cout << endl; } }