c++ - C++中的Strcpy不起作用

Question

谁能说出为什么这段代码中的 strcpy 返回一个空字符串？

#include <iostream>

char* strcpy(char* dest, const char* from) {
    for ( ; *from; dest++, from++) {
        *dest = *from;
    }

    return dest;
}

int main() {
    char a[] = "aba";
    char b[] = "hello";
    std::cout << strcpy(a, b);
    return 0;
}

我使用的编译器是 GNU G++11 4.9.2

更新:这也不管用 #包括

char* strcpy(char* dest, const char* from) {
    for ( ; *from; dest++, from++) {
        *dest = *from;
    }

    *dest = '\0';

    return dest;
}

int main() {
    char a[] = "abaaa";
    char b[] = "hello";
    std::cout << strcpy(a, b);
    return 0;
}

Answer 1

尝试使用临时指针:

char* strcpy(char* dest, const char* from) {
    char *tmp = dest;
    for ( ; *from; tmp++, from++) {
        *tmp = *from;
    }
    *tmp = '\0';

    return dest;
}

同时考虑为具有适当字符数的目标分配内存。