Summary - Operators

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.

Exercise 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.

Show example 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;
}

Test yourself

After x = 5; x += 3; what is x?
- 3
- 8
- 5
- 15
Show answer

8 — x += 3 means x = x + 3; 5 + 3 = 8.

Increment operator

int x = 5;
x____;
/* x is now 6 */

Show answer

int x = 5;
x++;
/* x is now 6 */

Match operator families

+

arithmetic
==

comparison
&&

logical
&

bitwise

Next lesson: printf formatting

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