Thread: Pointers and structures

I'm having a little trouble passing values from a structure to a function using pointers.

I have defined a structure as such:

Code:

struct Struct1 {
    short Shrt1;
    long Lng1;
    char Array1[60];
    double Doub1;
};

Then tried to declare a instance of this structure and a pointer to that as such:

Code:

    struct Struct1 inst1;
    struct Struct1 *ptr;
    ptr=&inst1;

I have then tried to pass values to a function and use them like this:

Code:

void function1(ptr)
{
    printf("\nShort integer 1: %d", ptr->Shrt1);
    printf("\nLong integer 1: %L", ptr->Lng1);
    printf("\nCharacter Array 1: %s", ptr->Array1);
    printf("\nDouble Precision Number 1: %d", ptr->Doub1);

return;
}

But I am getting an error saying that ptr is an invalid type argument. Any ideas where i'm going wrong? Do I need to post more of the code? should function use *ptr instead of ptr as an argument? I'm quite new to C and having trouble getting my head around the correct way to use pointers.

Ok, thank you. That now compiles ok, but I can't work out how to get the function to be called in the main body.

Code:

#include <stdio.h>
#include <stdlib.h>

struct Struct1 {
    short Shrt1;
    long Lng1;
    char Array1[60];
    double Doub1;
};

void function1(struct Struct1 *ptr);

int main()
{
    struct Struct1 inst1;
    struct Struct1 *ptr;
    ptr=&inst1;

    printf("Please enter short integer 1:");
    scanf("%d", &inst1.Shrt1);
    printf("Please enter long integer 1:");
    scanf("%d", &inst1.Lng1);
    printf("Please enter a character string:");
    scanf("%s", &inst1.Array1);
    printf("Please enter a double precision floating point number:");
    scanf("%f", &inst1.Doub1);

    function1();

    return 0;
}

void function1(struct Struct1 *ptr)
{
    printf("\nShort integer 1: %d", ptr->Shrt1);
    printf("\nLong integer 1: %L", ptr->Lng1);
    printf("\nCharacter Array 1: %s", ptr->Array1);
    printf("\nDouble Precision Number 1: %d", ptr->Doub1);

return;
}

I don't know what to put in for the arguments of function1 in main?

Oh ok, so should &inst1 work as the argument in the main body?

EDIT: Yea it does, I just have some type issues to correct. Thank you very much