Remove an element from a vector in C - c

Question

How can I remove an element from a vector in C without changing my print_vector function?
1) Here's the code that I made for removing an element on a position given from the keybord:
void remove_a_cost(int a)
{
int nr, c;
printf("Give the number of cost for remove: ");
scanf("%d", &nr);
if(nr>a)
{
printf("The remove is impossible!\n");
}
else
{
for(c=nr;c<=a;c++)
{
chelt[c]=chelt[c+1];
}
}
}
2)This is the print function
void print_costs(int a)
{
int i;
if(a>0 && a<=n)
{
for(i=1;i<=a;i++)
{
printf("\nCost %d\n\n",i);
printf("Day: %s\n", chelt[i].day);
printf("Sum: %d\n", chelt[i].sum);
printf("Type: %s\n", chelt[i].type);
}
}
}
3) Here's the add_new_cost() function
int add_new_cost()
{
int a,i;
printf("Nr of costs = ");
scanf("%d", &a);
if(a>0 && a<=n)
{
for(i=1;i<=a;i++)
{
printf("\nType the attributes for cost %d",i);
printf("\nDay = ");
scanf("%s",chelt[i].day);
printf("Sum = ");
scanf("%d", &chelt[i].sum);
printf("Type = ");
scanf("%s",chelt[i].type);
}
}
return a;
}
4) This is the main function
int main()
{
setbuf(stdout,NULL);
int b,choice;
do
{
printf("\nMenu\n\n");
printf("1 - Add a cost\n");
printf("2 - Print a cost\n");
printf("3 - Update a cost\n");
printf("4 - Delete a cost\n");
printf("5 - Exit\n\n");
printf("Command = ");
scanf("%d",&choice);
switch (choice)
{
case 1: b=add_new_cost();
break;
case 2: print_costs(b);
break;
case 3: update_cost(b);
break;
case 4: remove_a_cost(b);
break;
case 0: printf("Goodbye\n");
break;
default: printf("Wrong Choice. Enter again\n");
break;
}
} while (choice != 0);
return 0;
}
Example:
If I have 4 elements on the vector:
1)Type the attributes for cost
Day = luni
Sum = 2
Type = dsasa
Type the attributes for cost 2
Day = marti
Sum = 23
Type = adsds
Type the attributes for cost 3
Day = miercuri
Sum = 23
Type = asd
Type the attributes for cost 4
Day = joi
Sum = 232
Type = asdas
and I try to delete, let's say the 3rd element, this is what I receive when I print:
Cost 1
Day: luni
Sum: 20
Type: maradf
Cost 2
Day: marti
Sum: 23
Type: afas
Cost 3
Day: joi
Sum: 45
Type: sdfadsf
Cost 4
Day:
Sum: 0
Type:
The element(COST 4) appears when it should've been deleted. Is there a solution for deleting the element WITHOUT changing the print function?

Answer 1

After updating of question, everything is clear, do these modifications:
int remove_a_cost(int a)
{
int nr, c;
printf("Give the number of cost for remove: ");
scanf("%d", &nr);
if (nr > a)
{
printf("The remove is impossible!\n");
}
else
{
for (c = nr; c <= a; c++)
{
chelt[c] = chelt[c + 1];
}
a--; // decrease a
}
return a; // return new size
}
And
switch (choice)
{
case 1: b = add_new_cost();
break;
case 2: print_costs(b);
break;
case 3: update_cost(b);
break;
case 4: b = remove_a_cost(b); // <- store returned value in b
break;
case 0: printf("Goodbye\n");
break;
default: printf("Wrong Choice. Enter again\n");
break;
}

Answer 2

Your code is a bit messy. You should try to give meaningful names to your variables.
But, for what I understand, the print_costs function receives the value of the last 'cost' that it should print.
Perhaps you're passing it the wrong value after you remove a 'cost'.