| string alltrim(string source) | Trim spaces at the beginning and end of the string |
| string toupper(string source) | Transfer the contents of the string to uppercase |
| string tolower(string source) | Transfer the contents of the string to lowercase |
| + | Matchmaking strings (concatenation) |
| = | Assigning the value to a string variable |
| += | Assigns the value of a variable by adding the line to its current content |
| string itoa(int value) | Translate integer value in string |
| string сtoa(char value) | Translate an integer value into a string in the form of a symbol |
| string sprintf(string format, double value) | Translate floating point number to a string |
| int strcontains(string source,string substr) | If the source string contains the substr returns 1 (otherwise 0) |
| cout << arg1 << arg2 << ... | Display the information in the message box |