Multiply a number by 3.5 without using *, /, % operators

How would you multiply a number by 3.5 without using * , / or % , operators?

The number may be signed or unsigned.

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添加次数= n双和= 0;

for(int i=0;i<n;i++)
{
sum=sum+3.5;
}

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Math.log(Math.pow(Math.exp(x), 3.5))

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