将int值添加到char数组ASCII值C＃和JAVA

Question

in Java you can easily add an int value to a char array without defining it like this

String name = " maisam is my name ";
        char[] arr = name.toCharArray();

        for (int i = 0; i < arr.length; i++) {

            arr[i] += 100;

        }

but in c# you need to mention (char) while adding value

string name = " maisam is my name ";
        char[] arr = name.ToCharArray();

        for (int i = 0; i < arr.Length; i++) {

            arr[i] += (char) 100;
        }

I tried both ways in Java, worked perfectly , no error but in c# it gave me an error, why is that ? I searched everywhere didn't find any explanation regarding it !

Answer 1

This is more about what's going on behind the scenes rather than a syntax difference. You cast the same way in Java as you do in C#, but you just don't need to in this piece of Java code. In Java it automatically casts the int to a char type. But C# works differently, you must cast the value. It seems as though C# is a bit more strongly typed than Java.

Answer 2

this should work. c# implicitly casts char to int, but not int to char, so you have to cast the added int value to char before assigning to char array..

string name = " maisam is my name ";
char[] arr = name.ToCharArray();

for (int i = 0; i < arr.Length; i++) {
    arr[i] = (char)(arr[i] + 100);
}

EDIT: the code arr[i] += (char)100; also works fine. The above code is just an elaboration of the same code.

Answer 3

In simple words, there is no implicit conversion from int to char in C#

What you will have for C# int are,

int -> long , float, double, or decimal

See the other availability from this source .

Since you don't have an implicit conversion like

char c = 100 ;

But should use Explicit conversion

char c = (char) 100 ; 

Also here it is : C# char ( source )

Conversions

A char can be implicitly converted to ushort, int, uint, long, ulong, float, double, or decimal. However, there are no implicit conversions from other types to the char type.