Stoi Was Not Declared In This Scope Dev C Youtube C Stoi Was Not Declared In This Scope I'm trying to use stoi to convert a string to an integer, however it says it's not declared. I'm working with strings (#include ) and want to convert a string into an int using stoi I've gone through my code several times and I don't think there is anything wrong with it. However I have read about compilers and there might be an issue / incompatibility with mine. For info I'm on windows 7 64 bit, using Dev-C version 4.9.9.1.
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Description
The C library function int atoi(const char *str) converts the string argument str to an integer (type int).
Declaration
Following is the declaration for atoi() function.
Parameters
str − This is the string representation of an integral number.
Return Value
This function returns the converted integral number as an int value. If no valid conversion could be performed, it returns zero.
Example
The following example shows the usage of atoi() function.
Let us compile and run the above program that will produce the following result −