Comparison Operators
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Understanding Comparison Operators
Comparison operators let you evaluate and compare values. One of the trickier aspects of these operators is remembering the correct order or arrangement of the symbols, like determining whether < or = should come first.
When these operators are used in a program, the outcome will be either true or false. In the context of programming, true is typically represented as 1, and false is represented as 0.
Main.c
1234567891011#include <stdio.h> int main() { printf("Expression 8 == 7 + 1 is %d\n", 8 == 7 + 1 ); printf("Expression 10 != 3 is %d\n", 10 != 3 ); printf("Expression 7 > 7 is %d\n", 7 > 7 ); printf("Expression 20 >= 19 is %d\n", 20 >= 19 ); printf("Expression 21 <= 21 is %d\n", 20 <= 21 ); return 0; }
You'll frequently see comparison operators in loops and conditional statements.
Operator Precedence
Grasping the order of operations, or operator precedence, is crucial.
When it comes to precedence, the increment (++) and decrement (--) operators are evaluated first. This is followed by the multiplication (*) and division (/) operators. Lastly, the addition (+) and subtraction (-) operators are evaluated.
main.c
123456789101112#include <stdio.h> int main() { int a = 5; int b = 3; int c = 7; int d = a * ++b * c-- + 4; printf("The value of d: %d", d); return 0; }
To make complex expressions easier to read, you can add parentheses to show grouping and operator precedence.
int d = ((a * (++b)) * (c--)) + 4;
Prefix increment applies before use, postfix decrement after evaluation, and multiplications precede + 4. In the end the d variable will be 144 (and afterward b = 4, c = 6).
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