任意进制转换
js
/**
* 其他进制转10进制
* @param {Number} num
* @param {Number} n
*/
function otherToTen(num, n) {
let sum = 0;
let a = 'a'.charCodeAt()
let zero = '0'.charCodeAt()
for (let i = num.length - 1; i >= 0; i--) {
let char = num.slice(i, i + 1)
let az = /[a-z]/
let t = 0
if (az.test(char)) {
t = char.charCodeAt() - a + 10
} else {
t = char.charCodeAt() - zero
}
if (t >= n) {
throw new Error('error num')
}
sum += ~~(t * Math.pow(n, num.length - 1 - i))
}
return sum
}
/**
* 十进制转其它进制
* @param {Number} num
* @param {Number} n
*/
function tenToOther(num, n) {
let zero = '0'.charCodeAt()
let a = 'a'.charCodeAt()
let res = ''
while (num) {
let t = num % n
if (t >= 0 && t < 10) {
res = String.fromCharCode(t + zero) + res;
} else {
t -= 10
res = String.fromCharCode(t + a) + res;
}
num /= n
num = ~~num
}
return res
}
console.log(otherToTen('1001011', 2)); // 75
console.log(tenToOther('9999', 16)); // 270f
/**
* 其他进制转10进制
* @param {Number} num
* @param {Number} n
*/
function otherToTen(num, n) {
let sum = 0;
let a = 'a'.charCodeAt()
let zero = '0'.charCodeAt()
for (let i = num.length - 1; i >= 0; i--) {
let char = num.slice(i, i + 1)
let az = /[a-z]/
let t = 0
if (az.test(char)) {
t = char.charCodeAt() - a + 10
} else {
t = char.charCodeAt() - zero
}
if (t >= n) {
throw new Error('error num')
}
sum += ~~(t * Math.pow(n, num.length - 1 - i))
}
return sum
}
/**
* 十进制转其它进制
* @param {Number} num
* @param {Number} n
*/
function tenToOther(num, n) {
let zero = '0'.charCodeAt()
let a = 'a'.charCodeAt()
let res = ''
while (num) {
let t = num % n
if (t >= 0 && t < 10) {
res = String.fromCharCode(t + zero) + res;
} else {
t -= 10
res = String.fromCharCode(t + a) + res;
}
num /= n
num = ~~num
}
return res
}
console.log(otherToTen('1001011', 2)); // 75
console.log(tenToOther('9999', 16)); // 270f