Structure

[Skript]

Hello, i've done the most part of my task.
But there is 1 more thing to do
Need to find the "avarege mark of the student with entered surname"

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

	struct Student
	{
		char code[15];
		char surname[30];
		char disciplin[50];
		int mark;
	};
	int main()
	{
	

		int n;
		printf("Enter number students: ");
		scanf("%i", &n);

		Student *st=new Student[n];
		for (int i=0; i<n; i++)
		{
			printf("-----%i-----\n", i+1);
	
		printf("Student Code:");
		getchar();
		gets(st[i].code);
		printf("Surname: ");
		gets(st[i].surname);
		printf("Discipline: ");
		gets(st[i].disciplin);
		printf("Mark: ");
		scanf("%i", &st[i].mark);
		st[i].mark;

		}
		
			for (int i=0; i<n; i++)
				printf("\n%i %s %s %i\n", i+1, st[i].surname, st[i].disciplin, st[i].mark);
			{
		float sum=0;
		for (int i=0; i<0; i++)
		sum+=st[i].mark;
		sum/=n;
		printf("Averege mark=%f\n", sum);
			}
	getch();
	return 0;
	}