C/C++ char[] 转换为 int

C/C++, 字符串，比如 char* ch ="123" 转化为整形 int

int char_to_int(char * ch){

	char c;
	int result =0;
	while(c = *ch++){
		result *= 10; 
		result += (int)(c-'0');
	}
	return result;
}