Add R←X+Y

Y must be numeric.  X must be numeric.  R is the arithmetic sum of X and Y.  R is numeric. This function is also known as Plus.

Examples

      1 2 + 3 4
4 6
 
      1 2 + 3,⊂4 5
4  6 7
 
      1J1 2J2 + 3J3
4J4 5J5
 
      ¯5 + 4J4 5J5
¯1J4 0J5