C 프로그래밍 언어를 이용해서 각종 프로그램을 작성하곤 합니다. 최근에 많이 사용되고 있는 C11과 같은 경우는 string 헤더 파일에 전역 함수로 stoi 함수를 포함해서 사용할 수 있게 해주었습니다. Stoi는 쉽게 말해 문자열을 숫자로 변환하는 함수입니다. In this post, we will discuss how to convert a string to int in C. The standard approach is to use std::stoi function to convert a string to a number. It was introduced in C11 and is defined in header. I've added C11 support in Code::Blocks by going to Settings - Compiler and tick Have g follow the C11 ISO language standard -std=c11. It compiles and runs fine in CB, but when I'm trying to compile manually in the command line i. When I try to compile a simple number game with cygwin 4.9.3-1, it says stoi was not declared in this scope. I don't know what I'm doing wrong, and cannot find a way to fix it.
- The C Standard Library
- C Standard Library Resources
- C Programming Resources
- Selected Reading
The C library function int atoi(const char *str) converts the string argument str to an integer (type int).
Following is the declaration for atoi() function.
str − This is the string representation of an integral number.
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This function returns the converted integral number as an int value. If no valid conversion could be performed, it returns zero.
The following example shows the usage of atoi() function.
Let us compile and run the above program that will produce the following result −