How to perform forced type conversion in C language

In C language, you can perform forced type conversion through the "(type_name) expression" statement. The parameter "type_name" represents the name of the new type. For example, "(float)100" converts the value 100 of the int type. It is of float type. Forced type conversion is a type conversion that is explicitly proposed by the programmer and needs to be specified through code in a specific format. When programming, it is a good programming habit to use the forced type conversion operator whenever type conversion is needed. .

The operating environment of this tutorial: windows7 system, c99 version, Dell G3 computer.

Data type conversion is to convert data (variables, values, expression results, etc.) from one type to another.

C language has two data type methods:

• Automatic type conversion: It is the data type conversion performed silently, implicitly, and secretly by the compiler. This This conversion does not require programmer intervention and occurs automatically.

• Forced type conversion

Let’s take a closer look at the forced type conversion in C language.

Forced type conversion

Automatic type conversion is the result of the compiler's own judgment based on the context of the code. Sometimes it is not so "intelligent" ” cannot meet all needs. If necessary, programmers can also explicitly propose type conversion in the code themselves, which is called forced type conversion.

Automatic type conversion is a type conversion performed silently and implicitly by the compiler and does not need to be reflected in the code; forced type conversion is explicitly proposed by the programmer and needs to be performed through code in a specific format. Specifies a type conversion. In other words, automatic type conversion does not require programmer intervention, while forced type conversion requires programmer intervention.

The format of forced type conversion is:

(type_name) expression

• ##type_name is the new type name

• expression is an expression

(float) a;  //将变量 a 转换为 float 类型
(int)(x+y);  //把表达式 x+y 的结果转换为 int 整型
(float) 100;  //将数值 100（默认为int类型）转换为 float 类型

#include <stdio.h>
 
int main()
{
   int sum = 17, count = 5;
   double mean;
 
   mean = (double) sum / count;
   printf("Value of mean : %f\n", mean );
 
}

Type conversion is only temporary

#include <stdio.h>
int main(){
    double total = 400.8;  //总价
    int count = 5;  //数目
    double unit;  //单价
    int total_int = (int)total;
    unit = total / count;
    printf("total=%lf, total_int=%d, unit=%lf\n", total, total_int, unit);
    return 0;
}

Extended knowledge: Commonly used arithmetic conversions

#include <stdio.h>
 
int main()
{
   int  i = 17;
   char c = &#39;c&#39;; /* ascii 值是 99 */
   float sum;
 
   sum = i + c;
   printf("Value of sum : %f\n", sum );
 
}

Value of sum : 116.000000

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