Software Design Using C++
Review of Functions and Parameters
Answering the Question
First, we repeat the description of the problem:
Write a reasonable test program for the C++ function shown below.
If you need to review how to use C++ functions first,
go to the Complex Functions section of these web pages.
/* Given: NumGrade A numeric grade (whole number).
Task: To find the corresponding letter grade.
Return: This letter grade in the function name.
*/
char LetterGrade(int NumGrade)
{
if (NumGrade > 100)
return 'I';
else if (NumGrade >= 90)
return 'A';
else if (NumGrade >= 80)
return 'B';
else if (NumGrade >= 70)
return 'C';
else if (NumGrade >= 60)
return 'D';
else if (NumGrade >= 0)
return 'F';
else
return 'I';
}
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Begin by outlining a test program and supplying its documentation. Also, copy in the LetterGrade
function and supply a function prototype for it. This gives the following outline. Can you
now write the code for the main function?
/* Filename: decision.cpp
Author: Br. David Carlson
Date: December 20,2003
This is a test program that takes several numeric grades and converts
them into letter grades. The numeric grades are hard-coded into the
program. The numeric grades and corresponding letter grades are displayed
on the screen.
*/
#include <iostream>
using namespace std;
// Function prototypes:
char LetterGrade(int NumGrade);
int main(void)
{
// Code needs to be supplied here.
return 0;
}
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/* Given: NumGrade A numeric grade (whole number).
Task: To find the corresponding letter grade.
Return: This letter grade in the function name.
*/
char LetterGrade(int NumGrade)
{
if (NumGrade > 100)
return 'I';
else if (NumGrade >= 90)
return 'A';
else if (NumGrade >= 80)
return 'B';
else if (NumGrade >= 70)
return 'C';
else if (NumGrade >= 60)
return 'D';
else if (NumGrade >= 0)
return 'F';
else
return 'I';
}
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