Use the atoi function to convert 128 into a string as a code point. According to the public information about query, C language provides several standard library functions, which can convert any type of numbers (integer, long integer, floating point, etc. ) in a string. The method and description of each function are listed below. Itoa (): Converts an integer value to a string. If you don't use library functions such as atoi or sprintf, you can convert them into char types by adding 0 to each digit of an integer and storing them in a character array. However, it should be noted that the method of string inversion is needed.