Oct 23, 2018 In C language, there are three methods to convert a char type variable to an int. These are given as follows − sscanf atoi Typecasting; Here is an example of converting char to int in C language, Example. A string and an int are two incompatible types of things. You can't concatenate them. You must first convert the int to a string. You can have cout do it for you: cout and use a string stream.
Convert String To Int C
C++ provides following two types of string representations −
The C-Style Character String
The C-style character string originated within the C language and continues to be supported within C++. This string is actually a one-dimensional array of characters which is terminated by a null character '0'. Thus a null-terminated string contains the characters that comprise the string followed by a null.
The following declaration and initialization create a string consisting of the word 'Hello'. To hold the null character at the end of the array, the size of the character array containing the string is one more than the number of characters in the word 'Hello.'
If you follow the rule of array initialization, then you can write the above statement as follows −
Following is the memory presentation of above defined string in C/C++ −
Actually, you do not place the null character at the end of a string constant. The C++ compiler automatically places the '0' at the end of the string when it initializes the array. Let us try to print above-mentioned string −
When the above code is compiled and executed, it produces the following result −
C++ supports a wide range of functions that manipulate null-terminated strings −
Following example makes use of few of the above-mentioned functions −
When the above code is compiled and executed, it produces result something as follows −
The String Class in C++
The standard C++ library provides a string class type that supports all the operations mentioned above, additionally much more functionality. Let us check the following example −
When the above code is compiled and executed, it produces result something as follows −
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.
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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
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