I didn't know I could simply the following: summing digits until the sum is a single digit.

while(sum > 9) {

tempsum = sum;

sum = 0;

do {

sum += tempsum%10;

tempsum /= 10;

} while(tempsum != 0);

}

to simply:

if(sum1%9==0)

sum1=9;

else sum1%=9;

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