How to perform type conversion in c language

The C language provides two types of type conversion: implicit conversion (automatic) and explicit conversion (manual). Explicit conversion methods include the cast operator (type), sprintf()/sscanf() functions, atoi()/atof() functions, and strtol()/strtod() functions. Note that explicit conversions may result in data loss or loss of precision, and the special operator * applies to pointer types.

Type conversion in C language

C language provides two types of conversion: implicit conversion and Explicit conversion.

Implicit conversion

When two different types of data need to be operated, the compiler will automatically convert the low-precision data type to a high-precision data type . For example:

int a = 5;
float b = 2.5;
float c = a + b; // a 会隐式转换为 float

Explicit conversion

When you need to manually convert one data type to another data type, you can use the cast operator(type). For example:

int a = 5;
float b = (float)a; // a 显式转换为 float

In addition to cast, there are several other explicit type conversion methods:

• ##sprintf() and sscanf() functions: Convert data from string to number or from number to string.
• atoi() and atof() functions: Convert a string to an integer or floating point number.
• strtol() and strtod() functions: Convert a string to an integer or floating point number in the specified base.

Example

Suppose we have an integer variable

a and a floating point variable b. We can use the following code for type conversion:

// 使用强制类型转换将 b 转换为 int
int c = (int)b;

// 使用 sprintf() 函数将 a 转换为字符串
char str[10];
sprintf(str, "%d", a);

// 使用 atoi() 函数将 str 转换为 int
int d = atoi(str);

Note

Explicit type conversion may result in data loss or reduced precision.
• When performing type conversion, please ensure that the target type has enough space to accommodate the converted data.
• For pointer type conversion, you need to use the special pointer type conversion operator
• *.

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