在C中动态创建函数

#include<stdio.h>

int add(int a, int b) {
    return a + b;
}

int main() {
    int (*func_ptr)(int, int) = add;
    int result = func_ptr(1, 2);
    printf("Result: %d\n", result);
    return 0;
}

#include<stdio.h>
#include <dlfcn.h>

int main() {
    void *handle;
    double (*cosine)(double);
    char *error;

    handle = dlopen("libm.so.6", RTLD_LAZY);
    if (!handle) {
        fprintf(stderr, "%s\n", dlerror());
        exit(1);
    }

    cosine = dlsym(handle, "cos");
    error = dlerror();
    if (error != NULL) {
        fprintf(stderr, "%s\n", error);
        exit(1);
    }

    double result = (*cosine)(2.0);
    printf("Result: %f\n", result);

    dlclose(handle);
    return 0;
}