reference transmision

[spank]

#include<stdio.h>
#include<stdlib.h>
typedef struct
{
        int grad;
        int a[20];
} poli;

void citire(poli *a)
{
        int i;
        scanf("%d",&a->grad);
        for(i=a->grad-1;i>=0;i--)
                scanf("%d",&a->a[i]);
}

void tipar(poli a)
{
        int i;
        for(i=a.grad-1;i>=0;i--)
                printf("%dX^%d ",a.a[i],i);
}
int main()
{
        poli a;
        citire(&a);
        tipar(a);
        return 0;

}

why do i use & in the bolded lines ? wouldn't be more logical to read without & while variable a is a pointer ?

[Salem]

a is a pointer, but a->grad isn't a pointer (and that's what you're trying to read into).
Since scanf needs a pointer to where it's going to store the answer, you need the &