Summary - Operators
- C course
- Beginner
- Lesson 29/116
- 5 min
Combine arithmetic, comparison and bitwise operators to build a grade calculator.
Summary: Operators
In this group you saw five operator families:
- Arithmetic:
+ - * / % - Assignment:
= += -= ++ -- - Comparison:
== != < > <= >= - Logical:
&& || ! - Bitwise:
& | ^ ~ << >>
Comparison and logical operators return 1 or 0. Bitwise operators work on the bits of numbers. Let's combine them in a short exercise.
Practice Mixed operator exercise
Define int a = 10, b = 3;. With four printf calls print a + b, a % b, a > b and a & b on separate lines. Output should be 13, 1, 1, 2.
Starter code
#include <stdio.h>
int main(void) {
int a = 10, b = 3;
/* print a + b, a % b, a > b, a & b */
return 0;
}Sample solution
#include <stdio.h>
int main(void) {
int a = 10, b = 3;
printf("%d\n", a + b);
printf("%d\n", a % b);
printf("%d\n", a > b);
printf("%d\n", a & b);
return 0;
}Expected output
13 1 1 2
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 After x = 5; x += 3; what is x?
- 3
- 8 Correct answer
- 5
- 15
Explanation: x += 3 means x = x + 3; 5 + 3 = 8.
2 Increment operator
Question
int x = 5;
x____;
/* x is now 6 */
Answer
int x = 5;
x++;
/* x is now 6 */Explanation: Answer is ++. x++; makes x 6.
3 Match operator families
| Term | Meaning |
|---|---|
+ |
arithmetic |
== |
comparison |
&& |
logical |
& |
bitwise |