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C Basics

bookAssignment, Comparison, Not Equal To

You're already familiar with this operator. It assigns the value on the right to the variable on the left.

main.c

main.c

copy

              
1234567

            
#include <stdio.h>

int main() {
    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)
}

The assignement operator can be easily mistaken for the comparison one, but they do different things: = assigns; == compares and returns true/false. In conditions use == because = would modify the variable and the expression becomes that value.

Main.c

Main.c

copy

              
123456789

            
#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. You can see this by running the code yourself.

Note
Note

The binary values 0 and 1 can also represent states and can be use instead of true or false.

For inequality, you can use !=, which is true when the values differ. For example, 50 != 2 is true. In C, booleans are integers, so true is 1 and false is 0, meaning that expression evaluates to 1.

Main.c

Main.c

copy

              
123456789

            
#include <stdio.h>

int main() {
	int result = (50 != 2);

	printf("%d", result);

	return 0;
}
question mark

What is the output of the next code?

Select the correct answer

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Sektion 3. Kapitel 1

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bookAssignment, Comparison, Not Equal To

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You're already familiar with this operator. It assigns the value on the right to the variable on the left.

main.c

main.c

copy

              
1234567

            
#include <stdio.h>

int main() {
    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)
}

The assignement operator can be easily mistaken for the comparison one, but they do different things: = assigns; == compares and returns true/false. In conditions use == because = would modify the variable and the expression becomes that value.

Main.c

Main.c

copy

              
123456789

            
#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. You can see this by running the code yourself.

Note
Note

The binary values 0 and 1 can also represent states and can be use instead of true or false.

For inequality, you can use !=, which is true when the values differ. For example, 50 != 2 is true. In C, booleans are integers, so true is 1 and false is 0, meaning that expression evaluates to 1.

Main.c

Main.c

copy

              
123456789

            
#include <stdio.h>

int main() {
	int result = (50 != 2);

	printf("%d", result);

	return 0;
}
question mark

What is the output of the next code?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 3. Kapitel 1
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