tmp09
asked on
What's wrong with this?
Here is what I have so far. I am beginning to write a program.
#include<stdio.h>
#include<conio.h>
#include<iomanip>
#include<time.h>
#include<stdlib.h>
int randarray[];
int full;
int main(){
printf("Enter the number of integers you wish to sort.\n");
scanf("%d",&full);
for(int i = 0; i < full; i++)
{
randarray[i] = rand();
printf("%d\n",randarray[i]
}
return 0;
}
Why is it giving me this external error??
lab1.obj : error LNK2001: unresolved external symbol "int * randarray" (?randarray@@3PAHA)
Debug/letsgo.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
letsgo.exe - 2 error(s), 0 warning(s)
#include<stdio.h>
#include<conio.h>
#include<iomanip>
#include<time.h>
#include<stdlib.h>
int randarray[];
int full;
int main(){
printf("Enter the number of integers you wish to sort.\n");
scanf("%d",&full);
for(int i = 0; i < full; i++)
{
randarray[i] = rand();
printf("%d\n",randarray[i]
}
return 0;
}
Why is it giving me this external error??
lab1.obj : error LNK2001: unresolved external symbol "int * randarray" (?randarray@@3PAHA)
Debug/letsgo.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
letsgo.exe - 2 error(s), 0 warning(s)
ASKER
I don't want to give the array a specific size. The user needs to determine the size of the array. So how do I define it without giving it a size?
ASKER
Does it even matter?? Will the computer just allocate more memory if it needs it?
Or will it lock up if it runs out of array space?
Or will it lock up if it runs out of array space?
>>Will the computer just allocate more memory if it needs it?
Not automatically, you have to tell the computer to do it .. through malloc() etc .
/abhijit/
Not automatically, you have to tell the computer to do it .. through malloc() etc .
/abhijit/
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You'll also have to seed the random number generator using a call to randomize() or srand().Otherwise,you'll get the same values everytime.
you can use int a[] only when you initialize the values in the declaration itself.
for e.g.
int a[]={1,2,3,4};
it will automatically allocate an array of size 4.
but when u dont initialize the values,you have to provide the array size,or use a pointer and allocate mem. dynamically using malloc.
you can use int a[] only when you initialize the values in the declaration itself.
for e.g.
int a[]={1,2,3,4};
it will automatically allocate an array of size 4.
but when u dont initialize the values,you have to provide the array size,or use a pointer and allocate mem. dynamically using malloc.
Hi,
you cannot define an array without giving it a size. so following are the way by which you can declare an array.
1) directly give some size.
int randarray[256];
2) thorugh #define
#define SIZE 256
int randarray[SIZE];
if you want to do run time allocation
3) through malloc
printf("Enter the number of integers you wish to sort.\n");
scanf("%d",&full);
int *ranarray = (int *)malloc(sizeof(int) * full) ;
4)If you are working in linux or compiler which support C99 standard.
printf("Enter the number of integers you wish to sort.\n");
scanf("%d",&full);
int array[full] ;
But I suggest you tio make use of method 3.
or if you are working in C++ you can use vectors its a dynamic array
Dennis
you cannot define an array without giving it a size. so following are the way by which you can declare an array.
1) directly give some size.
int randarray[256];
2) thorugh #define
#define SIZE 256
int randarray[SIZE];
if you want to do run time allocation
3) through malloc
printf("Enter the number of integers you wish to sort.\n");
scanf("%d",&full);
int *ranarray = (int *)malloc(sizeof(int) * full) ;
4)If you are working in linux or compiler which support C99 standard.
printf("Enter the number of integers you wish to sort.\n");
scanf("%d",&full);
int array[full] ;
But I suggest you tio make use of method 3.
or if you are working in C++ you can use vectors its a dynamic array
Dennis
What was wrong with my answer?
int randarray[100];
or, even better
#define MAXRANDS 100
int randarray[MAXRANDS];
If you want, you can also allocate space dynamically, see your manual on malloc() or calloc();