Assignment, Comparison, Not Equal To
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We've learned how to store data in variables, organize data into arrays, and display data as strings. Yet, we haven't explored how to modify or manipulate that data.
Assignment Operator (=)
We're already familiar with this operator. It assigns the value on the right to the variable on the left:
int x = 5; // Assigns the value 5 to variable `x`
int y = 8; // Assigns the value 8 to variable `y`
x = y; // Assigns the value of `y` to `x` (so now, `x` is 8)
Comparison Operators (!=, ==)
Let's delve into how these work:
int result = (50 != 2);
The expression (50 != 2) evaluates to either true (1) or false (0), depending on the validity of the comparison.
The != operator stands for "not equal".
If 50 isn't equal to 2, then (50 != 2) evaluates to true.
In computing, the notions of "true" and "false" are numerically represented as 1 (true) and 0 (false):
1representstrue;0representsfalse.
Note
The binary values
0and1can also represent states. We've already encountered these values when discussing byte states in a previous lesson.
For instance, with the != operator:
Main.c
12345678910#include <stdio.h> int main() { int result = (50 != 2); printf("%d", result); return 0; }
The expression (50 != 2) evaluates to true, or 1.
The == operator checks for equality.
For instance:
Main.c
12345678910#include <stdio.h> int main() { int result = (50 == 2); printf("%d", result); return 0; }
The expression (50 == 2) is false, or 0, because 50 is not equal to 2.
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