Addition is one of the four primary arithmetic operations. The operator + (plus) operates on two operands to produce the sum.
sum = operand1 + operand2;
sum: variable. Allowed data types: int, float, double, byte, short, long.
operand1: variable or constant. Allowed data types: int, float, double, byte, short, long.
operand2: variable or constant. Allowed data types: int, float, double, byte, short, long.
int a = 5;
int b = 10;
int c = 0;
c = a + b; // the variable 'c' gets a value of 15 after this statement is executedThe addition operation can overflow if the result is larger than that which can be stored in the data type (e.g. adding 1 to an integer with the value 32,767 gives -32,768).
If one of the numbers (operands) are of the type float or of type double, floating point math will be used for the calculation.
If the operands are of float / double data type and the variable that stores the sum is an integer, then only the integral part is stored and the fractional part of the number is lost.
float a = 5.5;
float b = 6.6;
int c = 0;
c = a + b; // the variable 'c' stores a value of 12 only as opposed to the expected sum of 12.1