Common data type conversion problems and solutions in C
Introduction:
In C programming, conversions between different data types are often encountered question. Correct data type conversion is one of the keys to ensuring program correctness and performance. This article will introduce some common data type conversion problems and provide corresponding solutions and specific code examples.
1. Implicit type conversion
In C, there are many situations where the compiler will automatically perform type conversion. This conversion is called implicit type conversion. Implicit type conversion may cause data precision loss or operation errors. For example:
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In the above code, a and b are variables of int and double types respectively. The result of a / b is automatically converted to int type, causing the decimal part of the result to be truncated.
Solution:
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By using static_cast, we explicitly tell the compiler that a needs to be converted to double type.
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By converting b to double type, the calculation result will be the expected value.
2. String and numeric type conversion
In C, conversion between string and numeric types is common and important. Below are some common string and numeric type conversion problems and corresponding solutions.
Convert string to numeric type:
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Convert numeric type to string:
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Summary:
This article introduces common data type conversion problems in C and corresponding solutions. For implicit type conversions, we can use explicit conversions or optimize the order of calculation to avoid problems. For the conversion of string and numeric types, we can use stoi, stol, stof, stod to convert strings to numeric types, and use to_string to convert numeric types to strings. Correct data type conversion helps improve program correctness and performance. In the actual programming process, we should pay attention to potential problems with type conversion and choose appropriate methods for conversion.
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