CPP

c++ is string a number

bool isStringNumber(string str){
for(int i=0;i<str.length();i++){
if(str[i]<'0'||str[i]>'9'){
return false;
}
}
return true; 
}
//Beleive in Allah!
//just my slogan

c++ function for checking if a sting is a number

bool isParam (string line)
{
    if (isdigit(atoi(line.c_str())))
        return true;

    return false;
}

check if a string has numbers cpp

if (stringVariable.find_first_not_of("0123456789.-") == std::string::npos){
	return true;
}
else {
	return false;
}

c++ function for checking if a sting is a number

bool is_number(const std::string& s)
{
    std::string::const_iterator it = s.begin();
    while (it != s.end() && std::isdigit(*it)) ++it;
    return !s.empty() && it == s.end();
}