Modulo is an arithmetic operation that gives the remainder of a division. This operation is widely used in computer programming to solve various mathematical problems and to manipulate data. In C programming language, the modulo operation is performed using the modulo operator (%). However, there might be situations when you need to perform the modulo operation without using the modulo operator. This article will explain how to perform modulo in C without using the modulo operator and also provide some code examples for your reference.
Method 1: Using the Division Operator
One of the most straightforward ways to perform the modulo operation without using the modulo operator in C is by using the division operator (/). By dividing the numerator by the denominator and taking the remainder, you can get the modulus value. Here’s how to do it:
int numerator = 22;
int denominator = 7;
int quotient = numerator/denominator;
int remainder = numerator – denominator*quotient;
printf("remainder = %d
", remainder);
Note: In the above example, the numerator value is 22, and the denominator value is 7. We divide the numerator by the denominator and calculate the quotient. Then, we calculate the remainder by multiplying the denominator with the quotient and subtracting the product from the numerator.
Method 2: Using Bitwise Operators
Another approach to perform modulo in C without using the modulo operator is by using bitwise operators. Specifically, the bitwise AND operator (&) can be used to perform the modulo operation when the denominator is a power of two. Here’s how:
int numerator = 22;
int denominator = 8;
int remainder = numerator & (denominator – 1);
printf("remainder = %d
", remainder);
Note: In the above example, the denominator value is 8, which is a power of 2. We subtract 1 from the denominator and use the result as a bit mask. We then apply the bitwise AND operator between the numerator and the bit mask to get the remainder.
Method 3: Using Recursion
Another method to perform modulo in C without using the modulo operator is by using recursion. This method can be used for any situation, but it’s not very efficient for large inputs. Here’s how:
int mod(int numerator, int denominator)
{
if (numerator < denominator)
return numerator;
return mod(numerator – denominator, denominator);
}
Note: In the above example, we define a recursive function that takes a numerator and denominator as inputs. If the numerator is less than the denominator, we return the numerator itself, otherwise, we call the same function recursively by subtracting the denominator from the numerator until the numerator is less than the denominator.
Method 4: Using Ternary Operator
The last method to perform modulo in C without using the modulo operator is by using the ternary operator. This method is more efficient and straightforward than recursion and can be used for any input value. Here’s how:
int numerator = 22;
int denominator = 7;
int remainder = (numerator >= 0) ? numerator % denominator : denominator – (numerator % denominator);
printf("remainder = %d
", remainder);
Note: In the above example, we use the ternary operator to check if the numerator is positive or negative. If the numerator is positive, we use the modulo operator to get the remainder. Otherwise, we take the absolute value of the numerator, calculate the remainder using the modulo operator, subtract it from the denominator, and get the final result.
Conclusion
In conclusion, the modulo operation is an essential arithmetic operation that plays a critical role in computer programming. In C programming language, the modulo operation is typically performed using the modulo operator. However, there might be situations when you need to perform the modulo operation without using the modulo operator. This article explored four different methods to perform modulo in C without using the modulo operator. The methods include using the division operator, bitwise operators, recursion, and ternary operators. You can choose any of these methods based on your specific requirements and constraints and optimize your code accordingly.
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Popular questions
Sure! Here are 5 questions and answers regarding how to perform modulo in C without using the modulo operator:

What is the modulo operator in C?
The modulo operator in C is the percent symbol (%), and it returns the remainder of a division operation. 
Why might you need to perform modulo without using the operator?
You might need to perform modulo without using the operator if the modulo operator is not available in the language you are using or if using the modulo operator in your code would result in a performance issue. 
What is one way to perform modulo without using the operator in C?
One way to perform modulo without using the operator in C is to use the division operator (/) and subtraction to calculate the remainder. 
What is another way to perform modulo without using the operator in C?
Another way to perform modulo without using the operator in C is to use bitwise operators, particularly the bitwise AND operator (&), when the denominator is a power of two. 
What is a third way to perform modulo without using the operator in C?
A third way to perform modulo without using the operator in C is to use recursion, by creating a recursive function that takes the numerator and denominator as parameters and then subtracting the denominator from the numerator recursively until the numerator is less than the denominator.
Tag
Moduloization