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Solution to the clumsy factorial problem in JavaScript
Normally, the factorial of a positive integer n is the product of all positive integers less than or equal to n. For example, factorial(10) = 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1.
We instead make a clumsy factorial: using the integers in decreasing order, we swap out the multiply operations for a fixed rotation of operations: multiply (*), divide (/), add (+) and subtract (-) in this order.
For example, clumsy(10) = 10 * 9 / 8 + 7 - 6 * 5 / 4 + 3 - 2 * 1. However, these operations are still applied using the usual order of operations of arithmetic: we do all multiplication and division steps before any addition or subtraction steps, and multiplication and division steps are processed left to right.
Let's write the code for this function in JavaScript −
Example
const clumsy = num => {
let k=num;
let res = 0, temp=1, i=0;
while(k>0){
temp = k;
if(k-1>0){
temp*=(k-1);
}
if(k-2>0){
temp/=(k-2);
}
if(k-3>0){
if(k===num){
temp+=(k-3);
}else{
temp-=(k-3);
}
}
if(k===num){
res = temp;
}else{
res = res-temp;
}
k = k-4;
}
return res;
};
console.log(clumsy(4));
console.log(clumsy(10));
console.log(clumsy(16));
console.log(clumsy(5));Output
The output in the console will be −
7 11.75 16.609523809523807 7.666666666666668
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