morning everyone.
i hope someone out there could really help me.
im trying to store large numbers. as i need to complete my work under Dev-c++ environment but im not familiar with it as i just started using it recently.
the following is my initial coding for my work.
after i compile using Dev-C++, it shows this error description:
invalid conversion from 'char' to 'const char*'
initializing argument 1 of 'int atoi(const char*)'
i've tried all ways to modify my coding but i just cant get it.
really would be happy if someone could help me.
hope to receives some replies as soon as possible.thank you.
C++ Int To Const Char
Jul 10, 2010 A member function with the const qualifier can't amend a member variable. So what const cannot modify buffer but snprintf is attempting to do just that. You will need to remove the const qualifier. If, for whatever reason, you can't do that then create your own char. and return that then the calling function will need to assign it into buffer. 推荐：C编译遇到参数错误（cannot convert parameter. from 'const char.' to 'LPCWSTR'） 一看到上面的project configuration，有一个Character Set，因此我就对比了我上次编译通过的的工程配置和今天我新建的工程配置，下面是对比的图：第一幅图是今天.
Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. 'i' is not a character, it's a character array that basically decays to a pointer to the first element. You almost certainly want 'i'. Alternatively, you may actually want a lookup based on more than a single character, in which case you should be using 'i' but the type in that case is const char. rather than just char, both when defining c and in the base::lookup method. String literals are pointers to arrays of constant characters 'char const.'. Because of this, in your function 'Store( )', you're attempting to copy a pointer to constant data 'value' to a pointer to non-constant data 'a'. This violates const-correctness, and is therefore not allowed. Is there a way to convert from const char. to char. without casting away the const? I was warned that it could be dangerous and cause crashes (which I would agree with, since when I ran my program with constcast, it caused a segmentation fault). Alternatively, is there a way to convert from.
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Ancient Dragon5,243
My guess is the problem is in stack2.cpp. But since you did not post it there is no way to tell. Also please post the exact error message including file and line number
Is there a way to convert from const char * to char * without casting away the const? I was warned that it could be dangerous and cause crashes (which I would agree with, since when I ran my program with const_cast, it caused a segmentation fault). Alternatively, is there a way to convert from string to char * (not convert from string to const char *, as c_str() does)? Any suggestions would be greatly appreciated.
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Narue5,707
Arduino Const Char To Char
>Is there a way to convert from const char *
>to char * without casting away the const?
Short answer: No.
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>I was warned that it could be dangerous and cause crashes
It's const for a reason. For example, when you point to a string literal, the pointer should be declared as 'const char *' because string literals are stored in read-only memory. Casting away the const won't change the read-only nature of the data itself, and trying to modify it will probably cause a crash.
Convert Int To Const Char
You should only cast away const if you're so sure that the chamber is empty, you'd be willing to point the gun at your face and pull the trigger without any hesitation. In all other cases, work around the const. Make a copy, for example: