starC.cpp

// starC.cpp, 4/21/18, Mason Corey, A demonstration of ASCII Art printing C characters

#include <iostream>
#include <cstdlib>
#include <string>
using namespace std;

void assertEquals(string expected, string actual, string message);
string starC(int width, int height);
void runTests(void);

// Write starC per specifictions in the lab writeup
// so that internal tests pass, and submit.cs system tests pass


string starC(int width, int height)
{
  string result="";
  if(width>=2 && height>=3) {
    for(int i=0; i<width; i++)  {
      result+="*";
    }
    result+="\n";
    for(int k=2; k<height; k++) {
      result+="*";
      for(int j=1; j<width; j++)  {
        result+=" ";
      }
      result+="\n";
    }
    for(int i=0; i<width; i++)  {
      result+="*";
    }
    result+="\n";
  }
  return result;
}

// Test-Driven Development; check expected results against actual

void runTests(void) {

  // The following line works because in C and C++ when string literals
  // are separated only by whitespace (space, tab, newline), they 
  // automatically get concatenated into a single string literal

  string starC34Expected = 
    "***\n"
    "*  \n"
    "*  \n"
    "***\n";
  
  assertEquals(starC34Expected,starC(3,4),"starC(3,4)");

  string starC53Expected =     
    "*****\n"
    "*    \n"
    "*****\n";

  
  assertEquals(starC53Expected,starC(5,3),"starC(5,3)");

  assertEquals("",starC(2,1),"starC(2,1)");
  assertEquals("",starC(2,2),"starC(2,2)");

  string starC23Expected =     
    "**\n"
    "* \n"
    "**\n";
  
  assertEquals(starC23Expected,starC(2,3),"starC(2,3)");
}

// Test harness

void assertEquals(string expected, string actual, string message="") {
  if (expected==actual) {
    cout << "PASSED: " << message << endl;;
  } else {
    cout << "   FAILED: " << message << endl << "   Expected:[\n" << expected << "] actual = [\n" << actual << "]\n" << endl;
  }
}


// Main function

int main(int argc, char *argv[])
{
  
  if (argc!=3) {
    cerr << "Usage: " << argv[0] << " width height" << endl;
    exit(1);
  }
  
  int width = atoi(argv[1]);
  int height = atoi(argv[2]);
  // If the program is executed with parameters -1 -1 unit test
  // the starL() function using our automated test framework
  if (width==-1 && height==-1) {
    runTests();
    exit(0);
  }

  cout << starC(width,height);
  return 0;
}