go语言学习:数组/切片

Posted 2021-01-28 eilinge

学习区块链之后,发现还要学习加密,接触到的视频是:Go的crypto包,所以开始接触Go。因为和solidity有些相似,但是比solidity简单一些,就开始放松的心态去学习。
每天翻着go菜鸟教程,感觉简单的一批,可是当自己真要写代码的时候,就有点闷了.
--凡是还是得脚踏实地才行!

package main

import "fmt"

func main() {
    //var type_name []type
    /*
        切片:[]无参数
        数组:只能修改值,无法改变长度,无法添加新元素
            固定长度 [n]  [...] //根据元素的个数来设置数组的大小
    */
    var e []byte
    //var e []byte = make([]byte,len)
    //e := make([]byte,len)
    //var a = [5]byte //type [5]byte is not an expression,= []byte{}一定要加大括号
    var a [6]byte
    var b = [...]byte{0}
    var f byte = b[0]
    //var c [...]byte //use of [...] array outside of array literal
    //b = append(b, byte(1)) //first argument to append must be slice; have [0]byte
    fmt.Println(a, b, e, f)
    padding([]byte{1, 2, 3, 4, 4, 4, 4, 5}, 3)
}

//简单DES加密初识
func padding(src []byte, blockSize int) []byte {
    number := int(len(src)) % blockSize
    fmt.Println(blockSize)
    //e := blockSize
    d := make([]byte, blockSize)
    fmt.Println(d)
    var i int
    var newByte []byte
    //newByte = append(newByte, byte(0))
    for i = 0; i < blockSize; i++ {
        //return newByte[i] = 0
        newByte = append(newByte, byte(blockSize))
        //fmt.Println(i)
    }
    fmt.Println(newByte)
    if number == 0 {
        //src = append(src, [blockSize]byte{0})
        return src
    }
    fmt.Println(number)
    return src
}