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multiply n by 567,then divide the result by 9 =n*567/9=n*63. Now a question may arise why this simplification is needed? Ans: If  n*567/9 is written then n*567 will be evaluated then this result will be divided by 9. but n*567 will produce a large value when the value of n is large. This large value will cause overflow error or give wrong output.

#include<stdio.h>
 
int main()
{
    int testCase;
    int n;
    scanf("%d",&testCase);
    while(testCase--)
    {
        scanf("%d",&n);
        n=(n*63+7492)*5-498;
        if(n<0)
            n=-n;
        n=n/10;
        printf("%d\n",n%10);
    }
    return 0;
}

 

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