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

#define NAMELENGTH 20

struct customer {		// both words are the data type
    char name[NAMELENGTH];
    float acctbal;
};				// semicolon required!
		// any variables included here would be global (== evil)

typedef struct customer custtype;	// make one word typename 

// problem in creating pointer to struct as a parameter type
// void read(struct customer *c);  // must pass by reference to change


void read(custtype * cr);	// must pass by reference to change

/* Works, but inefficient because copies all customer data
void print(custtype c)
{
	printf("%s\t$%.2f\n", c.name, c.acctbal);
}
*/

void print(const custtype * c)
{
    printf("%s\t$%.2f\n", c->name, c->acctbal);
}

int main(void)
{
    custtype c1, *cptr;		// variables of the new type using typedef
    struct customer carray[5];	// array of the new type w/long name

    strcpy(c1.name, "Jill");
    c1.acctbal = 10000;
	print(&c1);

    cptr = carray + 4;
    (*cptr).acctbal = 1000;
    cptr->acctbal = 1000;
	strcpy(cptr->name, "last");

    strcpy(carray[0].name, "Jack");

    read(&c1);
    print(&c1);

    read(&carray[2]);		// read(carray+1);
	carray[1] = c1;

    for (int i = 0; i < 5; i++)
	  print(carray + i);
    return 0;
}

//void read(struct customer * c)

void read(custtype * c)
{
    char balance[20];
    printf("enter name: ");
    gets((*c).name);
    printf("enter account balance: $");
    gets(balance);
    c->acctbal = atof(balance);
}