Get three readings of gallons of fuels used and miles traveled by a vehicle and calculate the overall average of the miles traveled per gallon of fuel

#include<stdio.h>
#include<stdlib.h>
void line()
{
int i,j;
printf("\n");
for(i=1;i<=42;i++)
printf("=");
}
void header()
{
printf("\n");
printf("Built and Designed by Arslan Malik\n\n www.CworldbyAS.blogspot.com");
printf("\n");
}
int main()
{
line();
header();
line();


    int g,m,average,counter=1,total=0;
    while (counter<=3)
    {
        printf("Enter number of gallons : ");
        scanf("%d",&g);
        printf("Enter number of miles : ");
        scanf("%d",&m);
        counter++;
        total=total+m;
    }
    average=total/g;
    printf("Overall Average is : %d\n\n",average);


return 0;
}