| Function | Use |
| strlen | Finds length of a string |
| strlwr | Converts a string to lowercase |
| strupr | Converts a string to uppercase |
| strcat | Appends one string at the end of another |
| strncat | Appends first n characters of a string at the end of another |
| strcpy | Copies a string into another |
| strncpy | Copies first n characters of one string into another |
| strcmp | Compares two strings |
| strncmp | Compares first n characters of two strings |
| strcmpi | Compares two strings without regard to case ("i" denotes that this function ignores case) |
| stricmp | Compares two strings without regard to case (identical to strcmpi) |
| strnicmp | Compares first n characters of two strings without regard to case |
| strdup | Duplicates a string |
| strchr | Finds first occurrence of a given character in a string |
| strrchr | Finds last occurrence of a given character in a string |
| strstr | Finds first occurrence of a given string in another string |
| strset | Sets all characters of string to a given character |
| strnset | Sets first n characters of a string to a given character |
| strrev | Reverses string |