#include <stdio.h>
#include <stdlib.h>

int main() {
    int arr[9]={1,10,20,30,40,50,60,70,80};
    int number;
    int i,j;
    int entry=-1;
    printf("please enter number that you are looking for: ");
    scanf("%d",&number);
    
    while(1)
    {
        for(int i=0;i<9;i++)
        {
            if(arr[i]==number)
            entry=i;
        }
        if(entry==-1)
        {
            printf("\n%d does not exist in the array",number);
        }
        else
        {
            printf("\n%d does exist in the array it is entry %d: ",number,entry+1);
        }
        printf("\nplease enter another number: ");
        scanf("%d",&number);
        entry==-1;
    }
    
    return 0;
}