使用C预处理器将类型名转换为单个标记

#include <stdio.h>

#define TYPE_INT 1
#define TYPE_FLOAT 2
#define TYPE_CHAR 3

#define CONVERT_TYPE(type) \
    _Generic((type), \
        int: TYPE_INT, \
        float: TYPE_FLOAT, \
        char: TYPE_CHAR \
    )

int main() {
    int num = 10;
    float pi = 3.14;
    char ch = 'A';

    int convertedNum = CONVERT_TYPE(num);
    int convertedPi = CONVERT_TYPE(pi);
    int convertedCh = CONVERT_TYPE(ch);

    printf("Converted num: %d\n", convertedNum);
    printf("Converted pi: %d\n", convertedPi);
    printf("Converted ch: %d\n", convertedCh);

    return 0;
}