C and C++

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Help with a Beginning C Program

Help with a Beginning C Program

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tristangreer	2 Jun, 2008 - 04:19 PM Post #1
New D.I.C Head Joined: 2 Jun, 2008 Posts: 4	I need help with a beginning C program. It's a program designed to take numerical grades and convert them to letter grades, and then output both the numerical and letter grades. In addition, it has a loop which should allow someone to type y and enter another grade. If they hit n, it should stop. The program I've coded has a couple of issues. First, any numerical grade I enter gives me a letter grade of 70 (which isn't even a letter!) How do I fix this? In addition, when I press y to enter a new grade, it takes me back to the "do you want to enter another grade?" statement. I'm not sure how I screwed up the loop on this one. Any help you could give would be greatly appreciated. CODE #include<stdio.h> #pragma warning(disable:4996) int getNumGrade (); int calcLetterGrade(); int main (void) { int numgrade = 0; int lettergrade = 0; char cgoAgain = 'y'; printf ("Enter numerical grade value now:"); numgrade = getNumGrade (); lettergrade = calcLetterGrade(); printf ("\n When numerical grade is %d,",numgrade); printf ("letter grade is %d.", lettergrade); while (cgoAgain =='y' \|\| cgoAgain == 'Y') { printf("\nDo you want to enter another grade?"); scanf("%c%c",&cgoAgain); } return 0; } int getNumGrade() { int numgrade = 0; scanf("%d%c",&numgrade); return numgrade; } int calcLetterGrade (numgrade) { int lettergrade; if (numgrade < 60) lettergrade = 'F'; else if (numgrade < 70) lettergrade = 'D'; else if(numgrade < 80) lettergrade = 'C'; else if (numgrade <90) lettergrade = 'B'; else if (numgrade <100) lettergrade = 'A'; return lettergrade; }
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Amadeus	RE: Help With A Beginning C Program 2 Jun, 2008 - 04:43 PM Post #2
g++ -o drink whiskey.cpp Joined: 12 Jul, 2002 Posts: 12,229 Thanked: 40 times Dream Kudos: 25 My Contributions	You get a letter grade of 70 because you are setting the letter grade value as an integer data type - I expect you actually wish to use a char variable type. Your loop is functioning exactly as designed - what functionality did you want in the loop? Currently, all you do in the loop is prompt for user input.
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tristangreer	RE: Help With A Beginning C Program 2 Jun, 2008 - 04:48 PM Post #3
New D.I.C Head Joined: 2 Jun, 2008 Posts: 4	I wanted the loop to basically repeat the whole getNumGrade function again. I wanted to be able to type "y" and enter a new numerical grade, which basically repeats the whole process again. so instead of int calcLetterGrade and int lettergrade they should be char calcLetterGrade and char lettergrade?
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skater_00

RE: Help With A Beginning C Program
2 Jun, 2008 - 05:23 PM

Post #4

D.I.C Head

Joined: 30 Apr, 2008
Posts: 173

Windows

Thanked: 4 times
Dream Kudos: 50
My Contributions

The code below is C++, but it does what you want your program to do. Just convert it to C.

cpp


#include <iostream>

using namespace std;

int main()
{
	short int numgrade(0);
	char lettergrade, input('y');

	while (input == 'y' || input == 'Y') {
		cout << "Enter a numeric grade (0 - 100): ";
		cin >> numgrade;
		
		if (numgrade >= 0 && numgrade <= 100) {
			if (numgrade >= 0 && numgrade < 60) lettergrade = 'F';
			else if (numgrade >= 60 && numgrade < 70) lettergrade = 'D';
			else if (numgrade >= 70 && numgrade < 80) lettergrade = 'C';
			else if (numgrade >= 80 && numgrade < 90) lettergrade = 'B';
			else if (numgrade >= 90 && numgrade <= 100) lettergrade = 'A';
			cout << endl << "For a numeric grade of " << numgrade << ", the corresponding letter grade is " << lettergrade << "." << endl << endl;
		} else
			cout << endl << "Invalid numeric grade! Please try again." << endl << endl;

		while (true) {
			cout << "Do you want to enter another numeric grade? (y/n) ";
			cin >> input;
			cout << endl;
			
			if (input == 'y' || input == 'Y')
				main();
			else if (input == 'n' || input == 'N')
				break;
			else {
				cout << endl << "Invalid entry! Please try again." << endl << endl;
				continue;
			}
		}
	}

	return 0;
}

Hope this helps.

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Whizzy	RE: Help With A Beginning C Program 2 Jun, 2008 - 05:34 PM Post #5
Unregistered	and by the way Tristangreer, Welcome to our little family here at Dream in Code.
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tristangreer	RE: Help With A Beginning C Program 2 Jun, 2008 - 05:50 PM Post #6
New D.I.C Head Joined: 2 Jun, 2008 Posts: 4	It does help, but I'm totally new to C, and I've never touched C++. Is there a way to convert it easily?
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skater_00

RE: Help With A Beginning C Program
2 Jun, 2008 - 06:12 PM

Post #7

D.I.C Head

Joined: 30 Apr, 2008
Posts: 173

Windows

Thanked: 4 times
Dream Kudos: 50
My Contributions

I don't know C so I hope the code below is C. It's only the first part of the program though. The second part loves to battle me.


#include <stdio.h>

int main()
{
	short int numgrade(0);
	char lettergrade, input('y');

	while (input == 'y' || input == 'Y') {
		printf("Enter a numeric grade (0 - 100): ");
		scanf_s("%d", &numgrade);
		
		if (numgrade >= 0 && numgrade <= 100) {
			if (numgrade >= 0 && numgrade < 60) lettergrade = 'F';
			else if (numgrade >= 60 && numgrade < 70) lettergrade = 'D';
			else if (numgrade >= 70 && numgrade < 80) lettergrade = 'C';
			else if (numgrade >= 80 && numgrade < 90) lettergrade = 'B';
			else if (numgrade >= 90 && numgrade <= 100) lettergrade = 'A';
			printf("\nFor a numeric grade of %d, ", numgrade);
			printf("the corresponding letter grade is %c.\n\n", lettergrade);
		} else
			printf("\nInvalid numeric grade! Please try again.\n\n");
	}

	return 0;
}

This post has been edited by skater_00: 2 Jun, 2008 - 06:12 PM

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tristangreer	RE: Help With A Beginning C Program 2 Jun, 2008 - 06:52 PM Post #8
New D.I.C Head Joined: 2 Jun, 2008 Posts: 4	We're getting close. I can feel it, but that code doesn't look quite right. Could anyone tweak my code?
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