修复这个if，else语句 [英] Fixing this if,else statements

问题描述

问题似乎在

第18行：警告：指针和整数之间的比较

第22行：error：'else'之前的预期表达式

Line 18: warning: comparison between pointer and integer
Line 22: error: expected expression before 'else'

我做错了什么？有更好的方法吗？

What am I doing wrong? Is there a better way of doing this?

#include <stdio.h>

int main(void)
{
    char pname[25];
    char Y[1];
    char N[1];
    char choice[1];

    printf("when responding to Yes or No questions use Y/N.\n");
    printf("Hello,traveler Welcome to the Castle of Atal...."
            "What is your name?\n");
    scanf("%s", &pname);

    printf("Greeting's %s What bring's you to the kingdom of Tharnos?\n",
            pname);
    printf("I see how intresting do you wish to enter %s ?\n", pname);
    scanf("%c", &choice);

    if (choice == 'Y');
        printf("Enter %s...\n", pname);
    else (choice == 'N');
        printf("Farewell lost soul!\n");

    return 0;
}

推荐答案

char Y [1];
char N [1];
char choice[1];

到

 char Y;
 char N;
 char choice;

否则，使用当前定义， choice 表示数组（1个元素），

Otherwise, with the current definition, choice represents an array (of 1 element), which

• char 将会正常工作。


• 会触发执行 ，因为你不能比较数组与 == 运算符。

• is not required here, a single char will work just fine.
• will trigger the warning for doing choice == 'Y', because, you cannot compare array with == operator.

也就是说，

1. scanf（％c，& choice） code>应该 scanf（％c，& choice）; 以避免以前的换行符 。


2. scanf（％s，& pname）; 应为 scanf ，pname）; 以避免缓冲区溢出。



1. scanf ("%c",&choice); should be scanf (" %c",&choice); to avoid the previous newline.
2. scanf ("%s",&pname); should be scanf ("%24s",pname); to avoid buffer overrun.

： @iharob ，

3>

1. if（choice =='Y'）; ）（; 已移除），否则如果语句实际上无用。


2. else 没有条件表达式计算。但你可以使用 else if（choice =='N'）。

1. if (choice == 'Y');should be if (choice == 'Y') (the ; removed), otherwise, the if statement is effectively useless.
2. There is no conditional expression evaluation for else. You can make use of else if(choice == 'N'), though.

这篇关于修复这个if，else语句的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！