How does a program know to add two values when '+' sign is put in between them?

Question

int a=2;int b=3; a+b= int c; then c is 5
how does a program identify the operator and does the function related to that sign?

Answer 1

a and b both are integer here not strings. That's why '+' sign add the two values instead of concating them.

a="2"; b="3"; c=a+b; // c=23

because a and b both are strings here.

Answer 2

One more thing, these things are also common in PHP and JavaScript

Answer 3

For compiled program : they are transformed in binary files so the + is changed by the binary message of the addition for the processor.
For interpreted programs : quit the same but it is the interpreter which read the + that run its functionality which was transformed in the binary message for addition.

Answer 4

thanks for correcting my mistake

Answer 5

what if both are integers?