How to perform decimal division operation in golang

In Golang, it is very common for division operations to produce decimals. So how to correctly perform division operations on decimals? Let's look together.

First of all, dividing integers in Golang will get the quotient of the integer part, not the result in decimal form. For example, for the expression 5 / 2, we want the result to be 2.5, but in fact the result of the expression is 2. So how can we get the quotient of decimals? The answer is to divide one of the operands by a floating point number of 1.0. The following is a code example:

a := 5      // 整数类型
b := 2      // 整数类型
result := float64(a) / 1.0 / float64(b) 
fmt.Printf("%.2f", result)  // 输出结果为2.50

This code first forces the two integers a and b into floating point types, and then divides one of the operands by 1.0 to get the result in decimal form. Next, let’s look at another example. This time we convert both the divisor and the dividend into floating point types:

a := 5.0    // 浮点类型
b := 2.0    // 浮点类型
result := a / b
fmt.Printf("%.2f", result)  // 输出结果为2.50

In this way, decimal division operations are relatively simple, because we do not need to manually convert Data type, there is no need to manually add the 1.0 operand.

In addition, accuracy problems may occur when performing decimal calculations. For example, our expected result is 0.1 0.2=0.3, but in fact the result of this expression is 0.30000000000000004. This is because the computer cannot accurately express the two decimals 0.1 and 0.2 when calculating binary decimals. Although the values ​​we calculate are very small, it may still reduce the robustness and reliability of the program, so we need to pay special attention when performing decimal calculations.

In short, when performing decimal division operations in Golang, there are two methods: one is to manually convert the operands to floating point types for operation; the other is to divide one of the operands by a floating point type. Point 1.0 to get the result in decimal form. In addition, it should be noted that decimal calculations may have accuracy problems, and we should pay attention to avoid this situation in our programs.

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