無聊之下寫的程式，把程式碼當資料...

#include <stdio.h>

#include <stdlib.h>

#include <mem.h>


void funcA() {
    puts("hello\n");
}

void funcB() {}

int main() {
    void (*pfV)();

    size_t contextLength = (size_t)funcB - (size_t)funcA;
    printf("context length: %x\n", contextLength);
    pfV = (void(*)()) malloc(contextLength);
    memcpy((void*)pfV, (void*)funcA, contextLength);
    
    printf("%x\n", funcA);
    for (int i = 0; i < 16; ++i) {
        printf("%x,", ((char*)funcA)[i]);
    }
    puts("\n");

    printf("%x\n", pfV);
    for (int i = 0; i < 16; ++i) {
        printf("%x,", ((char*)pfV)[i]);
    }
    puts("\n");

    funcA();
    (*pfV)(); //segment exception

    return 0;
}