Thread: Grouping

No Matrix Total Grade
1 BK20001 84 A
2 BK20002 62 B-
3 BK20003 75 A-
4 BK20004 81 A
5 BK20005 70 B+
6 BK20006 39 D
7 BK20007 78 A-
8 BK20008 69 B
9 BK20009 49 C-


how do i group 1 BK20001 84 A together so when i sort the matrix the total and grade will follow?what code do i use to group them?

You could use the index sort I posted for you, previously.

Stand by and I'll go back to that program, and do it another way. Have you been taught pointers yet?

Originally Posted by Adak

You could use the index sort I posted for you, previously.

Stand by and I'll go back to that program, and do it another way. Have you been taught pointers yet?

yes i have been taught but i dont really know how to use it confuse me.

nvm u can try tell me how to point then i try find a way out of it.. if cant then i will just use another method

Try something like this. It sorts according to totals now, but you can change it to any records.member you want.

Code:

void Sorter(void)   {
   int i, j;   //these are just used for counting, nothing fancy
   Record *ptr1;
   Record *ptr2;
   Record *ptrtemp;  

   for(i = 0; i < 10-1; i++)  {
      for(j = i+1; j < 10; j++)  {
         ptr1 = &records[i];
         ptr2 = &records[j];
         if(ptr1->total < ptr2->total)  {
            *ptrtemp = *ptr1;
            *ptr1 = *ptr2;
            *ptr2 = *ptrtemp;
         }
      }
   }
}

Originally Posted by Adak

Try something like this. It sorts according to totals now, but you can change it to any records.member you want.

Code:

void Sorter(void)   {
   int i, j, gar;   //these are just used for counting, nothing fancy
   Record *ptr1;
   Record *ptr2;
   Record *ptrtemp;  

   for(i = 0; i < 10-1; i++)  {
      for(j = i+1; j < 10; j++)  {
         ptr1 = &records[i];
         ptr2 = &records[j];
         if(ptr1->total < ptr2->total)  {
            *ptrtemp = *ptr1;
            *ptr1 = *ptr2;
            *ptr2 = *ptrtemp;
            gar++;
         }
      }
   }
}

i want to short by matrix number.. so i just change the part

i

Code:

f(ptr1->total < ptr2->total)    {
            *ptrtemp = *ptr1;
            *ptr1 = *ptr2;
            *ptr2 = *ptrtemp;
            gar++;
         }

to

i

Code:

f(ptr1->matrix <ptr2 ->matrix {
strcpy(*ptrtemp, *ptr1);
strcpy(*ptr1, *ptr2);
strcpy(*ptr2, *ptrtemp);
gar++;
}

Originally Posted by Adak

Try something like this. It sorts according to totals now, but you can change it to any records.member you want.

Code:

void Sorter(void)   {
   int i, j;   //these are just used for counting, nothing fancy
   Record *ptr1;
   Record *ptr2;
   Record *ptrtemp;  

   for(i = 0; i < 10-1; i++)  {
      for(j = i+1; j < 10; j++)  {
         ptr1 = &records[i];
         ptr2 = &records[j];
         if(ptr1->total < ptr2->total)  {
            *ptrtemp = *ptr1;
            *ptr1 = *ptr2;
            *ptr2 = *ptrtemp;
         }
      }
   }
}

do i put this under main?

i try this fuction in main after the calculate part?i get alot error by doing so..

I had it in it's own function called Sorter();

You need to add the prototype for the function:
void Sorter(void);

Before main();

Then you call the Sorter function with this:
Sorter();
in main(), after you do the calculations to get the total.

I don't know what "matrix number" is. You can sort it according to any of these things:

Code:

typedef struct {
   char student[30];
   int no;
   int q1;
   int q2;
   int q3;
   int proj;
   int mid;
   int final;
   int total;
}

and nothing else (unless you change it).

i still get error ok this is what i did

Code:

#include<stdio.h>
#include<string.h>

void Sorter(void)

then after the calculation part i do this.

Code:

sorter();

void Sorter(void)   {
   int i, j;  
   Record *ptr1;
   Record *ptr2;
   Record *ptrtemp;  

   for(i = 0; i < 10-1; i++)  {
      for(j = i+1; j < 10; j++)  {
         ptr1 = &records[i];
         ptr2 = &records[j];
         if(ptr1->total < ptr2->total)  {
            *ptrtemp = *ptr1;
            *ptr1 = *ptr2;
            *ptr2 = *ptrtemp;
         }
      }
   }
}

but i still get alot of error, what i did wrong?

You called Sorter, "sorter", and that won't fly. Change it to Sorter();

Originally Posted by archriku

i still get the same error after i change it..

after calculation

Code:

Sorter(void);

   Sorter(void)   {
   int i, j;   
   Record *ptr1;
   Record *ptr2;
   Record *ptrtemp;  

   for(i = 0; i < 10-1; i++)  {
      for(j = i+1; j < 10; j++)  {
         ptr1 = &records[i];
         ptr2 = &records[j];
         if(ptr1->student[30] < ptr2->student[30])  {
            *ptrtemp = *ptr1;
            *ptr1 = *ptr2;
            *ptr2 = *ptrtemp;
         }
      }
   }
}

alot of the error came out as missing { or ( something like that.. i m thinking izzit the void Sorter fuction came in wrong place?

void Sorter(void);

Goes up on top (outside) of main().

I'm really confused. What do want to sort these records by?

First it was "total", then it was "matrix number" (whatever that is), and now you're here with "student"

You can't compare strings in C, like that. You have to use strcmp(string1, string2) == 0, or is > 0, or is < 0, to compare strings.

Originally Posted by Adak

void Sorter(void);

Goes up on top (outside) of main().

I'm really confused. What do want to sort these records by?

First it was "total", then it was "matrix number" (whatever that is), and now you're here with "student"

You can't compare strings in C, like that. You have to use strcmp(string1, string2) == 0, or is > 0, or is < 0, to compare strings.

nono dont need to sort with total.. the student is actually matrix number but i just declare it as student something like that..

So the first two letters are like the initials of the student or teacher, and the number that follows it is the students "matrix number"?

Is that right?

Originally Posted by Adak

So the first two letters are like the initials of the student or teacher, and the number that follows it is the students "matrix number"?

Is that right?

yea BK08110110 something like a person ID

Originally Posted by archriku

yea BK08110110 something like a person ID

So is that persons matrix number BK08110110 or is it just 08110110?