C has six relational operators that you use to compare two values.
| Operator | Comparison |
|---|---|
| < | Is the left operand less than the right operand |
| <= | Is the left operand less than or equal to the right operand |
| == | Is the left operand equal to the right operand |
| != | Is the left operand not equal to the right operand |
| > | Is the left operand greater than the right operand |
| >= | Is the left operand greater than or equal to the right operand |
| Each of these operations results in a value of type int. The result of each operation is 1 if the comparison is true and 0 if the comparison is false. | |
| stdbool.h header defines the symbols true and false for 1 and 0 respectively. | |
| 2 != 3 results in true. | |
| The expressions 2 == 3 results in the value 0, which is false. |
These expressions are called logical expressions or Boolean expressions.
Boolean expressions returns just one of two values: either true or false.
You can store the result in a variable of type bool. For example:
bool result = 5 < 4; // result will be false
You can assign the result of an arithmetic expression to a bool variable and store true if it is nonzero and false otherwise.