read marks up to random times and calculate average

  #include <stdio.h>

int main() {
    int std,marks,count=1,total=0;
    int sum=0;
    while(count){
        printf("enter marks  :");
        scanf("%d",&marks);
      
      sum=sum+marks;
      count++;
      total++;
      if(marks==888)
      break;
    }
   int avg=(sum-888)/total;
    printf("average is : %d",avg);
}