var_dump in C

var_dump.c

#include <stdio.h>
#include <stdarg.h>
#include <stdbool.h>

#define VAR_DUMP(var) _var_dump(#var, var)

void _var_dump(const char *var_name, ...);

int main() {
    int i = 42;
    float f = 3.14f;
    double d = 2.71828;
    char c = 'A';
    bool b = true;

    VAR_DUMP(i);
    VAR_DUMP(f);
    VAR_DUMP(d);
    VAR_DUMP(c);
    VAR_DUMP(b);

    return 0;
}

void _var_dump(const char *var_name, ...) {
    va_list args;
    va_start(args, var_name);

    char format_specifier = *va_arg(args, char *);

    switch (format_specifier) {
        case 'i':
            printf("%s: int(%d)\n", var_name, va_arg(args, int));
            break;
        case 'f':
            printf("%s: float(%f)\n", var_name, va_arg(args, double));
            break;
        case 'd':
            printf("%s: double(%lf)\n", var_name, va_arg(args, double));
            break;
        case 'c':
            printf("%s: char(%c)\n", var_name, va_arg(args, int));
            break;
        case 'b':
            printf("%s: bool(%s)\n", var_name, va_arg(args, int) ? "true" : "false");
            break;
        default:
            printf("%s: unknown type\n", var_name);
            break;
    }

    va_end(args);
}