Thread: inputting multimensional arrays

Try a structure for the records. Keep all the data togather as you collect it.

Say

Code:

typedef struct
{
        char	Surname[64];
        char	Firstname[64];
        char	Address[128];
	long    PhoneNum;
}  PHONE_RECORD_STRUCT;

//for non dynamic array
PHONE_RECORD_STRUCT  PhoneNum[1000];

If you have done it use dynamic memory allocation with malloc(), calloc() realloc() ect. Allocate one record and as more are added, realloc another.

If you are not using a struct I would not worry about the dynamic mem allocation.

Using the struc declared before

Code:

//declare a pointer to the data type needed 
PHONE_RECORD_STRUCT  *pPhoneNum;
//malloc the first record
pPhoneNum=(PHONE_RECORD_STRUCT *) malloc( sizeof (PHONE_RECORD_STRUCT) );

//fill in first record, when asked for second record iNumRecords++;

//realloc for next record
// iNumRecords is the number of records
pPhone=(PHONE_RECORD_STRUCT *) realloc( pPhone, sizeof (PHONE_RECORD_STRUCT) * iNumRecords );

//To input record details, iIndex is zero based array reference (0 to iNumRecords-1)
pPhone[iIndex].PhoneNum=lInputBuffer;
sprintf(pPhone[iIndex].SurName,"%s",sInputBuffer);
//ect

But I would not worry about this at the moment.
Use
#define MAX_RECORDS 1000//handy number to define
char InName[MAX_RECORDS][]; //or similar

> #define MAX_RECORDS 1000//handy number to define
> char InName[MAX_RECORDS][]; //or similar

I'd opt for the 'or similar' approach:

char *InName[MAX_RECORDS];

Read the name into a buffer, then allocate space for it and copy it there.

InName[x] = malloc( strlen( buffer ) +1 );

Quzah.

Just to clarify for BR7

>> strlen( buffer ) +1 (amount of memory to allocate)

char buffer[64]={"hello\0"};

strlen(buffer)=5 [not 64 or 6 (misses out the '\0')]

strlen() returns the length without the terminator '\0' so need to add 1 to ensure enough space

As each string (element) of the array (ie InBuffer[2] or InBuffer[3]) has no memory each must be malloc()'ed individually as used.

realloc() is not needed unless the element that has already been malloc()'ed is changed and more (or less) memory is needed [realloc() can only be used on an element that has been previously alloc()'ed]

can simply do without any dynamic memory allocation

char InBuffer[MAX_RECORDS][64];//less than 64Kb of mem