C# Math.BigMul() – Examples
In this tutorial, we will learn about the C# Math.BigMul() method, and learn how to use this method to multiply big integers like Int32, Int64, etc., with the help of examples.
BigMul(Int32, Int32)
Math.BigMul(a, b) produces the full product of two 32-bit numbers a and b.
Syntax
The syntax of BigMul(a, b) method is
Math.BigMul(Int32 a, Int32 b)
where
| Parameter | Description |
|---|---|
| a | The first number of type Int32 to multiply. |
| b | The second number of type Int32 to multiply. |
Return Value
The method returns value of type Int64.
Example 1 – BigMul(a, b)
In this example, we will multiply two numbers, a and b, of type Int32 using Math.BigMul() method.
C# Program
using System;
class Example {
static void Main(string[] args) {
Int32 a, b;
Int64 result;
a = 285689659;
b = 799999992;
result = Math.BigMul(a, b);
Console.WriteLine($"BigMul({a},{b}) = {result}");
a = -28599634;
b = -8544192;
result = Math.BigMul(a, b);
Console.WriteLine($"BigMul({a},{b}) = {result}");
}
} Output
BigMul(285689659,799999992) = 228551724914482728 BigMul(-28599634,-8544192) = 244360764025728
BigMul(Int64, Int64, Int64)
Math.BigMul(a, b, low) produces the full product of two 64-bit numbers a and b.
Syntax
The syntax of BigMul(a, b, low) method is
Math.BigMul(Int64 a, Int64 b, out Int64 low)
where
| Parameter | Description |
|---|---|
| a | The first number to multiply. |
| b | The second number to multiply. |
| low | The low 64-bit of the product of the specified numbers. |
Return Value
The method returns Int64 value. The higher 64 bits of the product is returned and the lower 64 bits of the product is stored in low.
Example 2 – BigMul(a, b, low)
In this example, we will take two very large numbers in Int64 variables, and find their product using Math.BigMul() method.
C# Program
using System;
class Example {
static void Main(string[] args) {
Int64 a, b;
Int64 low, result;
a = 2856896599999999919;
b = 1856896599999987580;
result = Math.BigMul(a, b, out low);
Console.WriteLine($"result = {result}");
Console.WriteLine($"low = {low}");
}
} Output
result = 287582543666998578 low = 3922365799111403972
BigMul(UInt64, UInt64, UInt64)
Math.BigMul(a, b, low) produces the full product of two unsigned 64-bit numbers a and b.
Syntax
The syntax of BigMul(UInt64, UInt64, UInt64) method is
Math.BigMul(UInt64 a, UInt64 b, out UInt64 low)
where
| Parameter | Description |
|---|---|
| a | The first number to multiply. |
| b | The second number to multiply. |
| low | The low 64-bit of the product of the specified numbers. |
Return Value
The method returns high 64-bit of the product of the specified numbers, a value of type UInt64.
Example 3 – BigMul(a, b, low)
In this example, we will two unsigned long numbers and find their product using Math.BigMul() method.
C# Program
using System;
class Example {
static void Main(string[] args) {
UInt64 a, b;
UInt64 low, result;
a = 2856896599999999919;
b = 1856896599999987580;
result = Math.BigMul(a, b, out low);
Console.WriteLine($"result = {result}");
Console.WriteLine($"low = {low}");
}
} Output
result = 287582543666998578 low = 3922365799111403972
Conclusion
In this C# Tutorial, we have learnt the syntax of C# Math.BigMul() method, and also learnt how to use this method with the help of C# example programs.