In Java, why the output of int a=('a'+'b'+'c'); are different form System.out.println('a'+'b'+'c'+"")
java
Solution
- The first one does not compile, because you concatenate a String at the end which cause the value to be a String which can't be converted directly to int.
- The output of the second one is 150, because ASCII value for character 1,2,3 are 49,50,51 which return 150 when doing the addition.
- The output of the last one is 294, because you are doing an addition of char values in the ASCII table (97+98+99)
You can verify the values here for a,b and c (or any other character).
Edit : To explain why the last one output the correct value instead of throwing an error, you first sum all the values as explained before, then convert it to a String adding "" to the sum of the ASCII values of the chars. However, the println method expect a String which is why it does not throw any error.
The first one would work if you would do `Integer.parseInt('1' + '2' + '3' + "");`
Problem
the original question is like this. ``` public class test { public static void main(String[] args){ int i = '1' + '2' + '3' + ""; System.out.println(i); } } ``` and this gives me an error: ``` Exception in thread "main" java.lang.Error: Unresolved compilation problem: Type mismatch: cannot convert from String to int ``` then I changed the code like this: ``` public class test { public static void main(String[] args){ int i = '1' + '2' + '3'; System.out.println(i); } } ``` the out put is 150. but when I write my code like this: ``` public class test { public static void main(String[] args){ System.out.println('a'+'b'+'c'+""); } } ``` the output become 294. I wonder why.