Define a struct
struct array
{
int *data;
int capacity;
int size;
};
Initialize it
void initialize(struct array *p)
{
p->capacity=1;
p->data=(int*)malloc(p->capacity*sizeof(int));
p->size=0;
}
Expand the capacity once size=capacity
The call to realloc grows the array to the new size, preserving the existing elements, and returns a pointer to it or NULL if there isn't enough memory.
void expand(struct array *p,int a)
{
if(p->size == p->capacity)
{
p->capacity=p->capacity*2;
p->data=realloc(p->data,p->capacity*sizeof(int));
}
p->data[p->size++]=a;
}
Never forget FREE
void FREE(struct array *p)
{
free(p->data);
p->size=0;
p->capacity=1;
}
main part
int main()
{
struct array a;
int i,x;
initialize(&a);
printf("Enter the number\n");
while(1)
{
if(scanf("%d",&x) ==EOF)
{
printf("End of input\n");
break;
}
else
expand(&a,x);
}
for(i=0;i<a.size;i++)
{
printf("%d",a.data[i]); // notice here, a.data[i]
}
FREE(&a);
return 0;
}
View complete code here.
