main 中引用的未解析的外部符号

Question

我必须创建一个程序，它有一个函数 charster()，它接受三个参数：一个字符和两个整数。它将每 y 行打印字符输入 x 次。我收到语法错误 LNK2019 和 LNK1120 在 main.xml 中引用的未解析的外部符号。并且 IDK 我做了什么导致这个或做什么来纠正它。

这是我的代码：

#include <stdio.h>

void charster(char n, int n_char, int n_lines);

int main(void)
{
    char n;
    int n_lines, n_chars;

    printf("Please enter a character to be printed, the amount of times it should appear, and the amount of lines that should appear: ");

    while (scanf("%c, %d, %d", &n, &n_chars, &n_lines) == 3)
    {
        charster(n, n_chars, n_lines);
    }
    return 0;


    void charster(char n, int n_char, int n_lines);
    {
        int count; 

        for (count = 0; count < n_lines; count++)
        {
            putchar(n);
        }
    }
}

Answer 1

首先，C 语言不支持嵌套函数。所以你必须在主函数之外编写函数charster()。

你可以写在主函数的上面或下面，因为原型已经声明了。

请看下面的代码：

#include<stdio.h>

void charster(char n, int n_char, int n_lines);

int main(void)
{
    char n;
    int n_lines, n_chars;

    printf("Please enter a character to be printed, the amount of times it should appear, and the amount of lines that should appear: ");

    while (scanf("%c %d %d", &n, &n_chars, &n_lines) == 3)
    {
        charster(n, n_chars, n_lines);
    }
    return 0;
}

void charster(char n, int n_char, int n_lines)
{
    int times; 
    int lines;
    for (lines = 0; lines < n_lines; lines++)
    {
        for(times=0;times<n_char;times++){
            printf("%c ", n);
        }
        printf("\n");
    }
}