以 C 风格编写的 C++ 程序无法使用 C 编译器编译

Question

这个问题已经有答案了:

Does C support overloading? (9 个回答)

已关闭 5 年前。

我是一名学生，开始学习 C++，之前有一些 C 知识。我有一个以 C 风格编写的工作 C++ 代码，它有一个用于输入 double 的重载函数。或string :

#include "stdio.h"
#include "string.h"
#include "ctype.h"

const int STR_LEN = 7;
int try_to_input(double* real_number);
int try_to_input(char (*string)[STR_LEN]);//line 16

int main()
{
    return 0;
}

int try_to_input(double* real_number) {//line 35
    int attempts_for_input = 3;
    //stops when == 0
    while (attempts_for_input) {
        //if input unsuccessful
        if (scanf_s("%lf", real_number) == 0) {
            puts("Invalid input! Try again.");
            attempts_for_input--;
            //flush stdin
            int tmp;
            while ((tmp = getchar()) != EOF && tmp != '\n');
            //extra '\n' after that for some reason
        }
        else return 0;
    }
    return -1;
}

int try_to_input(char (*string) [STR_LEN] ) { //line 53
    int attempts_for_input = 3;

    while (attempts_for_input) {
        if (gets_s(*string, STR_LEN) == NULL) {
            puts("Invalid input! Try again.\n");
            attempts_for_input--;
            //flush stdin
            int tmp;
            while ((tmp = getchar()) != EOF && tmp != '\n');
        }
        else return 0;
    }
    return -1;

}

但是当我将其编译为 C 时，它给出了以下错误:

(16): warning C4028: formal parameter 1 different from declaration(35): warning C4028: formal parameter 1 different from declaration(53): error C2084: function 'int try_to_input(double *)' already has a body(35): note: see previous definition of 'try_to_input'

<小时/>可能是什么问题呢？我的重载出了什么问题？

Answer 1

I have a working C++ code written in C style, that has an oveloaded function [..]

停下来!

C 确实不支持函数重载，因此会出现编译错误。阅读更多 Does C support overloading?