c - main() 函数中简单程序的分段错误错误

Question

我刚刚开始自学C，并想用main((编写一个基本程序，该程序将接受用户输入的密码，使用正确的密码进行检查，并具有适当的输出。但是，程序开始运行并读取用户输入，但随后突然终止，出现错误分段错误(代码转储(。导致错误的代码有什么问题？

#include <stdio.h>
int main(void)
{
    printf("Enter the passwordn");
    char guess;
    scanf(" %c", &guess);
    char password[] = "Hello123";
    int correct = 0;
    while (correct != 1){
        if(strncmp(password,guess)==0){
            printf("Success! You have logged in with your password 
            %cn",guess);
            correct +=1; 
        }
        else
        {
            printf("Incorrect password. Try againn");
        }
    }
}

Answer 1

嘿，

我有幸重新编码了你的代码

#include <stdio.h>
#include <string.h>
int main(void)
{
    char *guess;
    const char password[] = "Hello123";
    int correct = 0;
    while (correct != 1){
        /*
         * Include the input prompt inside while loop
         */
        if (correct == 0){
            printf("Enter the passwordn");
            scanf(" %s", guess);
        }
        if(strncmp(password,guess, 10)==0){ //strncmp accept 3 params, set length e.g 10
            printf("Success! You have logged in with your password %sn",guess);
            correct = 1;
        }
        else
        {
            printf("Incorrect password. Try againn");
            correct = 0;
        }
    }
}