The string instrument that has only one string is the monochord. The monochord is a simple instrument consisting of a single string stretched over a resonating chamber. It is used to demonstrate principles of acoustics and music theory, such as the relationship between string length and pitch. The monochord has been used for centuries in various cultures for educational and experimental purposes. **

To create a new string from an existing string in Java, you can use the `+` operator to concatenate two strings together. For example, if you have two strings `str1` and `str2`, you can create a new string by using `String newString = str1 + str2;`. This will combine the contents of `str1` and `str2` and store the result in `newString`. Alternatively, you can also use the `concat()` method to concatenate two strings, like this: `String newString = str1.concat(str2);`. Both methods will create a new string from existing strings in Java. **

You can check if a string occurs in another string in C by using the `strstr()` function from the `<string.h>` library. This function searches for the first occurrence of a substring within a string and returns a pointer to the location where the substring is found. If the substring is not found, it returns NULL. You can use this function to determine if a string occurs in another string by checking if the return value is not NULL. **

In Java, a string cannot be converted to a string because a string is already a string data type. It is not necessary to convert a string to a string because it is already in the correct format. If there is a need to manipulate or modify the string, it can be done using various string manipulation methods provided by the String class in Java. Therefore, there is no need to convert a string to a string in Java. **

A standard tennis racket typically requires a string length of around 40 feet (12.2 meters). Therefore, a 122m string would be more than enough to string a tennis racket, with plenty of excess string left over. In fact, a 122m string could potentially be used to string multiple tennis rackets. **

To check for a specific character string in a string c, you can use the `find()` method in Python. This method returns the index of the first occurrence of the specified string within the given string. If the string is not found, it returns -1. You can use this index to determine if the specific character string exists in the string c. **

You can save the first word of a string in another string by using string manipulation functions. One way to do this is by using the split() function to separate the words in the string and then accessing the first element of the resulting array. Another way is to use the substring() function to extract the first word based on the position of the first space in the string. Once you have the first word, you can save it in another string variable for further use. **

A string is a sequence of characters stored in a data structure that includes information about the length of the string. In contrast, a C-string is a sequence of characters terminated by a null character ('\0') and is typically represented as an array of characters in C programming. C-strings do not store information about their length, so functions that operate on C-strings must rely on the null terminator to determine the end of the string. **