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<p>Given the main() function below which calls 3 other functions, complete the body of the 3 other functions
   such that the output of the program will be <strong><tt>aabbaa</tt></strong> followed by a <strong>newline</strong>.</p>
   
   <p>Examine the order of the function calls and how the second call to f1 is composed of a call to f2.</p>
   
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Copied from problem cpp/functions/hypotenuse (author: redekopp@usc.edu)
Copied from problem cpp/functions/abs_func (author: redekopp@usc.edu)
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#include <iostream>
using namespace std;
void f1(char c);
char f2(char c);
void f3();
int main() 
{
    char c = 'a';
    f1(c);
    f1(f2(c));
    f1(c);
    f3();
    return 0;
}
void f1(char c)
{
   \[ 
      cout << c << c;
     ]\
}
char f2(char c)
{
   \[
    return c+1;
   ]\
}
void f3()
{
    cout << \[ endl ]\;
}
C++ test suite
json list of stdin/args tests
e.g. [{"stdin":"hi", "args":["4", "5"]},
{"stdin":"noargs"}]

to just run once with no input use [{}]
 
[
   {}
]
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Note: problems are open-source by default (see 'Public permissions'). Assumed license for open problems is Creative Commons 4.0 Attribution-ShareAlike unless specified in 'Remarks'.