int numdigits(int num){

int len = 0;

while(num >= 10){
num = num/10;
len++;
}

return len;
}

This algorithm is used to count the number of digits but I can't understand it.
Someone explain it to me please :D

Thanks

Add print statements after each line to print out the values that were set/changed on that line. Then you'll be able to understand how it works.

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