代码中的问题是scanf。使用scanf阅读字符时，需要使用格式说明符%c，并使用&运算符提供存储字符的变量的地址：

#include <stdio.h>
#include <stdlib.h>

int main() // Changed from 'void' to 'int' as it is a good practice to return an integer from main
{
    char choice = 'y';
    while (choice != 'n')
    {
        printf("Enter choice(y/n):- \n");
        scanf(" %c", &choice); // Note the space before %c to consume any leading whitespace

        if (choice == 'y')
        {
            printf("Choice = y\n");
        }
        else if (choice == 'n') // Use 'else if' to check for 'n' after checking for 'y'
        {
            printf("Choice = n\n");
            exit(0); // Use exit(0) to indicate successful termination
        }
    }
    return 0; // Return 0 from main to indicate successful execution
}

字符串

#include <stdio.h>
#include <stdlib.h>
void main()
{
 char choice;
 do
  {
    printf("Enter choice(y/n):- \n");
    scanf(" %c", &choice);
    if(choice == 'y')
    {
        printf("Choice = y\n");
    }
    else if (choice == 'n')
    {
        printf("Choice = n");
        exit(0);
    }
  }while(choice != 'n');
}

字符串