Convert string to corresponding escape seq character (Eg "\n" to '\n')

StringToEscSeq.cpp

#include<iostream>
using namespace std;

#include<stdexcept>

#include<string.h>

char strToEscSeq(const char str[])
{

	//short int ctr = 0;
	if (str[0]=='\\')	//it itself is an escape sequence, which means single backslash'\'

	switch(str[1])
	{
		case 'a': return '\a';
		case 'b': return '\b';
		case 'n': return '\n';
		case 'r': return '\r';
		case 't': return '\t';
		case 'v': return '\v';
		
		default : throw runtime_error("Invalid string arguement");
	}
	else
	throw runtime_error("Invalid string arguement");
}

int main(int argc, char * argv[])
{
	char res;
	char inputString[3] = "\\n";
	/*
	char inputString[2];
	inputString[0] = '\\';
	inputString[1] = 'n';
	*/
	//Both ways work

	try
	{
		res = strToEscSeq(inputString);
	}
	catch(runtime_error err)
	{
		cout<<err.what();
		return 1;
	}
	cout<<res<<' '<<(int)res<<"!!";
}