如何解决字符串代码 [英] How to solve the string code

问题描述

#include<conio.h>
#include<stdio.h>
int main()
{
char *str="India";
str[1]='D';
printf("%s",str);
return 0;
}

以上代码中的申报问题

任何其他错误请说我



我尝试了什么：



i尝试过包括string.h但它是给出运行时错误

declaration problem in above code
any other mistakes please say me

What I have tried:

i have tried including string.h but it is giving an runtime error

推荐答案

那应该是：

That should be:

#include <stdio.h>
int main()
{
  char str[] = "India";
  str[1]='D';
  printf("%s\n", str);
  return 0;
}

您的序列

Your sequence

引用：

char * str =India;

str [1] ='D';

char *str="India";
str[1]='D';

错误，因为没有分配可写内存 str 仅指向只读内存（字符串文字India） 。

is wrong, because there is no writable memory allocated for str that merely points to read-only memory (the string literal "India").

str 是指向 string literal - cppreference.com [ ^ ]。修改此类文字的内容会导致未定义的行为。



而是使用

str is a pointer to a string literal - cppreference.com[^] . Modifying the content of such literals results in undefined behavior.

Instead use

char str[] = "India";

这将创建一个数组，并将字符串文字的内容复制到该数组。

This will create an array and copies the content of the string literal to that array.

Quote：

上面代码中的声明问题

这可以是任何东西，具体取决于你的编译器和版本。

给出错误信息和位置。

This can be anything depending on your compiler and the version.
Give error messages and positions.

引用：

任何其他错误请说我

调试器将显示你的代码所做的事情。



当你不明白你的代码在做什么或为什么它做它做的时候，答案是调试器。

使用调试器查看代码正在执行的操作。只需设置断点并查看代码执行情况，调试器允许您逐行执行第1行并在执行时检查变量，这是一个令人难以置信的学习工具。



调试器 - 维基百科，免费的百科全书 [ ^ ]

掌握Visual Studio 2010中的调试 - 初学者指南 [ ^ ]

使用Visual Studio 2010进行基本调试 - YouTube [ ^ ]



调试器在这里向您展示您的代码在做什么你的任务是与它应该做的事情进行比较。

调试器中没有魔法，它没有发现错误，它只是帮助你。当代码没有达到预期的效果时，你就会接近一个错误。

The debugger will show you what your code does.

When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute, it is an incredible learning tool.

Debugger - Wikipedia, the free encyclopedia[^]
Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Basic Debugging with Visual Studio 2010 - YouTube[^]

The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.

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