Thread: functions problem

First of all hello everyone I have a dilemma about displaying the max and the min using functions and arrays. As you can see I tried something but it doesn't work (the commented lines). Any comment is appreciated, thanks.

Code:

#include<stdio.h>
	char Name[30][50];
	float grades[30];
	


void DisplayTitle()
{
	printf("\tTitle\n");
	printf("\t---------------\n");
}

int ReadNBStudent()
 {
	 int nbstudent[50],I=0;
	 do
	 {
	printf("Enter the number of students ");
	 scanf("%i",&nbstudent);
	 }
	 while(nbstudent[I]>30 || nbstudent[I]<2);
	return nbstudent[I];
 }

int ReadAllStudent(int nb,int I=0)
{
	
	for(int I=0;I<nb;I++)
	{
	fflush(stdin);
	printf("Student %i\n",I+1);
	printf("Name ");
	gets(Name[I]);
	do {
	printf("Grade ");
	scanf("%f",&grades[I]);
	}
	while(grades[I]>100 || grades[I]<0);
	}
	return Name[I],grades[I];
}

int DisplayClass(int nb, int I=0)
{
	printf("The Class\n");
	printf("Students Names\tGrades\n");
	for(int I=0;I<nb;I++)
	{
	
	printf("%14s\t%6.2f\n",Name[I],grades[I]);
	}
	return Name[I],grades[I];
}

/*int DisplayMax(int Max, float grades[30])
{
	if (grades[0]>Max)
	Max=grades[0];
	return Max;
}

void Y(int nb,int I=0)
{
	for(int I=0;I<nb;I++)
	{
	printf("The winners are\n");
	printf("%s %.2f",Name[I],grades[I]);
	}
}*/

void main()
{
	int nb,Max;
	float grades[30];
	DisplayTitle();
	nb=ReadNBStudent();
	ReadAllStudent(nb);
	DisplayClass(nb);
	//Max=DisplayMax(Max,grades[30]);
	//Y(Max);

	
}

Should have put Grades[I] instead of [0], thank you for that, I didn't see it. Now I'm trying to display them in a function and then call the function in the main and I can't get it to work.

Normally it would be something like

Code:

Min=Max=Grades[0];
if(grades[I]>Max)
grades[I]=Max
else
grades[I]=Min
for(int I=0;I<nb;I++) 
{ printf("%s %.2f",Name[I],Grades[I]);
}

I can't understand how to put it in a function.

So I made some changes to it:

Code:

int DisplayMax(int Max,int I=0)
{
	if (grades[I]>Max)
	Max=grades[I];
	return Max;
}

void Y(int nb,int I=0)
{
	printf("The winners are\n");
	for(int I=0;I<nb;I++)
	{
	fflush(stdin);
	printf("%s %.2f",Name[I],grades[I]);
	}

void main()
{
	int nb,Max=0,I=0;
	float grades[30];
	DisplayTitle();
	nb=ReadNBStudent();
	ReadAllStudent(nb);
	DisplayClass(nb);
	grades[0]=Max;
	Max=DisplayMax(grades[I]);
	Y(Max);	

	
}

and that's what it shows...I'm lost