Posted in c_programming

Demystifying Relational Operators in C Programming

   January 1, 2024

Relational operators are essential components of C programming that allow you to compare values and make decisions based on the results. In this article, we’ll explore the basics of C programming’s relational operators, including == (equal to), != (not equal to), < (less than), > (greater than), <= (less than or equal to), and >= (greater than or equal to). Through real-world examples and output demonstrations, you’ll gain a firm grasp of how to use these operators effectively. Relational operators are indispensable tools in C programming, enabling you to make decisions based on comparisons between values. In this article, we’ve explored the basic relational operators (==, !=, <, >, <=, and >=) with real-world examples and output demonstrations. Armed with this knowledge, you’re well-equipped to write more complex C programs that involve decision-making and conditional statements.

Equal To (==)

The == operator is used to compare two values for equality. If the values are equal, it returns true; otherwise, it returns false. Let’s illustrate this with an example:

#include <stdio.h>
int main() {
    int num1 = 10;
    int num2 = 5;
    if (num1 == num2) {
        printf("num1 is equal to num2\n");
    } else {
        printf("num1 is not equal to num2\n");
    }
    return 0;
}

Output:

num1 is not equal to num2

Not Equal To (!=)

The != operator is used to check if two values are not equal. If they are not equal, it returns true; otherwise, it returns false. Here’s an example:

#include <stdio.h>
int main() {
    int num1 = 10;
    int num2 = 5;
    if (num1 != num2) {
        printf("num1 is not equal to num2\n");
    } else {
        printf("num1 is equal to num2\n");
    }
    return 0;
}

Output:

num1 is not equal to num2

Less Than (<) and Greater Than (>)

The < and > operators are used to compare values to check if one is less than or greater than the other. Let’s examine both operators with examples:

#include <stdio.h>
int main() {
    int num1 = 10;
    int num2 = 5;
    if (num1 < num2) {
        printf("num1 is less than num2\n");
    } else {
        printf("num1 is not less than num2\n");
    }
    if (num1 > num2) {
        printf("num1 is greater than num2\n");
    } else {
        printf("num1 is not greater than num2\n");
    }
    return 0;
}

Output:

num1 is not less than num2
num1 is greater than num2

Less Than or Equal To (<=) and Greater Than or Equal To (>=)

The <= and >= operators are used to check if one value is less than or equal to or greater than or equal to another value, respectively. Let’s see how they work in practice:

#include <stdio.h>
int main() {
    int num1 = 10;
    int num2 = 10;
    if (num1 <= num2) {
        printf("num1 is less than or equal to num2\n");
    } else {
        printf("num1 is not less than or equal to num2\n");
    }
    if (num1 >= num2) {
        printf("num1 is greater than or equal to num2\n");
    } else {
        printf("num1 is not greater than or equal to num2\n");
    }
    return 0;
}

Output:

num1 is less than or equal to num2
num1 is greater than or equal to num2
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