How to pass array of structure as a parameter of int function - c

Question

I would like to pass array of structure as a parameter of int function but every time I try to do it. I get the [Error] expected ';', ',' or ')' before '.' token on line 19 where the int function name add is. If I change to int add(int totalCost,struct items *input,int quantity) there will be [Warning] passing argument 2 of 'add' makes pointer from integer without a cast.
#include<stdio.h>
#include<string.h>
struct items
{
int No;
char singleitem[29];
int cost;
};
struct items input[5] = { {0, "Aluminium-air battery",355}, { 1, "Bunsen cell",500}, { 2, "Dry cell",550 }, { 3,"Galvanic cell",350},
};
struct items* ptr = input;
int main()
{
int nonRechargeableBatteries,i=0,choice,c=1,a[10],totalCost=0,quantity=0;
int add(int totalCost,struct items input[i].cost,int quantity)
{
totalCost+=input[i].cost*quantity;
return totalCost;
}
for(i=0; i<5; i++)
a[i]=0;
do
{
//C is 1 by default
if(c==1)
{
printf("\npress number in front of command that you would like to do\n");
printf("1 - non-rechargeable batteries\n2 - cart summary\n");
printf("Enter : ");
scanf("%d",&choice);
switch(choice)
{
case 1:
{
int nonRechargeableBatteries;
printf("\nselect various kind of battery to buy\n1 - Aluminium–air battery\n2 - Bunsen cell\n3 - Dry cell\nAny other number to exit\n");
scanf("%d",&nonRechargeableBatteries);
switch(nonRechargeableBatteries)
{
case 1:
{
int num;
printf("You chose Aluminium–air battery.\nPress 1 to add to the cart.\nAny other number to cancel\n");
scanf("%d",&num);
if(num==1)
{
printf("enter how many items you want : ");
scanf("%d",&quantity);
a[0]+=quantity;
totalCost = add(totalCost,input[0].cost,quantity);
}
break;
}
.
.
.
}
break;
}
case 2:
{
printf("No\tItems%-21sQuantity\tCost\n"," ");
for(i = 0 ; i<5 ; i++,ptr++)
{
if(a[i]!=0)
{
printf("%d\t%s%-4s%d\t\t%d\n",input[i].No,input[i].singleitem," ",a[i],(input[i].cost*a[i]));
}
}
printf("\nTotal Cost\t\t\t\t\t%d\n",totalCost);
printf("continue shopping Enter\n1 to Add Item\n2 to Delete Items\n3 Add or subtract existing item(s) in cart \nAny other number to Exit\n");
scanf("%d",&c);
}
default:
{
if(c==1)
printf("Enter Valid Categories Choice\n");
else;
break;
}
}
if(choice>0&&choice<2)
{
printf("No\tItems%-21sQuantity\tCost\n"," ");
for(i=0; i<5; i++)
{
if(a[i]!=0)
{
printf("%d\t%s%-4s%d\t\t%d\n",input[i].No,input[i].singleitem," ",a[i],(input[i].cost*a[i]));
}
}
printf("\nTotal Cost\t\t\t\t\t%d\n",totalCost);
printf("continue shopping Enter\n1 to Add Item\n2 to Delete Items\n3 Add or subtract existing item(s) in cart \nAny other number to Exit\n");
scanf("%d",&c);
}
else;
}
}
while(c==1 || c==2 ||c==3);
printf("Your total cost is %d\n",totalCost);}

Answer 1

If I change to int add(int totalCost,struct items *input,int quantity) there will be [Warning] passing argument 2 of 'add' makes pointer from integer without a cast.
Of course if you declare the function parameter input to be of type struct items *, you must not pass an int argument input[0].cost, but a struct items * as declared:
totalCost = add(totalCost, input, quantity);