Hi all + need help with code

**Team GB** · 11-25-2005

Hi all this is my first time posting and I thought Id join this forum as I need some help now and again when I have problems with C. Also there seems to be alot of nice people on here

.

I am trying to create a program with user inputting studentID,name and there unit mark. Outputting Student ID,name, average mark and Highest and lowest mark.
Any ideas on highest and lowest mark?

Code:

# include <stdio.h>
int main ()
		/* declare variables */
{
		int studentID, n, max_value;
		float total_mark = 0, unit_mark = 0, average_mark, array;

		/*Input ID*/
		printf ("Enter your student ID: ");
		scanf("%d",& studentID);

		/*Input 12 marks + divide by 12 for average*/
		for (n = 0;  n < 12 ; n++)
	{
		printf("Enter your unit mark: ");
		scanf("%f",&unit_mark);
		total_mark = total_mark + unit_mark;
	}
	average_mark = total_mark /12;

	/*Work out highest and lowest mark*/
	max_value = array[0];
		for (n = 0;  n < 12 ; n++)
	{
		if (array[n] > max_value)
		{
			max_value = array[n];
		}
	}




	
	printf("The student %d got a total mark of %6.2f and an average mark of %6.2f, ", studentID, total_mark, average_mark);
}

I have tried highest mark but it has a pointer error which I sort of know what it is.

Any help, thanks

**Silfer** · 11-25-2005

Your array variable isn't an array, it is a float. Thus, this all falls into pieces. Declare array as one with 12 slots, and I think your code will work better.

**Team GB** · 11-25-2005

O ic,

so instead of float something like this:-

char array[12];

but it still says C:\Program Files\PellesC\Projects\week5\week6a.c(37): warning #2096: Missing return value.
?
or do I need something like

int[] array = new int[12];

**jamie85** · 11-25-2005

Originally Posted by Team GB

but it still says C:\Program Files\PellesC\Projects\week5\week6a.c(37): warning #2096: Missing return value.
?
or do I need something like

int[] array = new int[12];

You declare main as an int, but you dont return anything at the end of the function.

so instead of float something like this:-

char array[12];

try this

Code:

float array[12];

**NoUse** · 11-25-2005

Originally Posted by Team GB

O ic,

so instead of float something like this:-

char array[12];

but it still says C:\Program Files\PellesC\Projects\week5\week6a.c(37): warning #2096: Missing return value.
?
or do I need something like

int[] array = new int[12];

C doesn't dynamically allocate memory with new. Just as the guy above me said, main() has a return type of int, but I don't see anything being returned.

**Silfer** · 11-25-2005

Originally Posted by Team GB

O ic,

so instead of float something like this:-

char array[12];

but it still says C:\Program Files\PellesC\Projects\week5\week6a.c(37): warning #2096: Missing return value.
?
or do I need something like

int[] array = new int[12];

Arrays in C can be declared like this: type name[size];

So you would want a float array[12];

the keyword new does not exist in C - your Java days are over, and yes, it is a hard transfer.

IMHO, you should google some basics - on arrays and pointers in C, for example.

Best regards,

**dwks** · 11-25-2005

You should return 0 from main() if nothing went wrong (you can use other numbers to indicate different errors):

Code:

int main(void) {
    return 0;
}

**Silfer** · 11-25-2005

Oh, and also, when you read the numbers, you are not storing them in the array currently - you should if you want to keep them and want to find the highest/lowest.

**Team GB** · 12-02-2005

Now that the arrays are sorted out I know I need to put my unit marks into it, but im not sure how.

Ive got the loop figured out to find the max_value.

Code:

# include <stdio.h>
int main ()

		/* declare variables */
{
		int studentID, n;
		float total_mark = 0, unit_mark = 0, average_mark, max_value = 0;
		int array[11];


		/*Input ID*/
		printf ("Enter your student ID: ");
		scanf("%d",& studentID);

		/*Input 12 marks + divide by 12 for average*/
		for (n = 0;  n < 12 ; n++)
	{
		printf("Enter your unit mark: ");
		scanf("%f",&unit_mark);
		total_mark = total_mark + unit_mark;
	}
	average_mark = total_mark /12;
	
	




	/*Work out highest and lowest mark*/

		for (n = 0;  n < 12 ; n= n + 1)
	{
		if (array[n] > max_value)
		{
			max_value = array[n];
		}
	}




	
	printf("The student %d got a total mark of %6.2f and an average mark of %6.2f ", studentID, total_mark, average_mark);

	printf("The highest mark for student %d was %6.2f ", studentID, max_value);
}

**spydoor** · 12-02-2005

To store the values in the array....

Code:

    for (n = 0;  n < 12 ; n++)
    {
        printf("Enter your unit mark: ");
        scanf("%f",&unit_mark);

        total_mark = total_mark + unit_mark;
        array[n] = unit_mark;
    }

also your array size should be 12
even though you are counting from 0 to 11 (which is correct) you are still storing 12 elements

You are reading in floats so your array should be float

Btw you really don't need the second loop. you can just keep track of the max in your first loop. Though then there'd be no need for the array at all.

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