code for calculating average

#include"stdio.h"
#include"conio.h"
int avg,i,j,a[50][2],sum=0,count=0;
void main()
{
    for(i=0;i<50;i++)
    {
        printf("Enter id number on %d: ",i );
        scanf("%d",&a[i][0]);
        if(a[i][0]<0)
            break;
        else
        {
        printf("Enter expensive on %d: ",j);
        scanf("%d",&a[i][1]);
        }
        sum+=a[i][1];
        count++;
    }
    avg=sum/count;
    printf("Avrege is %d :",avg);
    getch();
}

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