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| CAXPY Subroutine | Computes a constant times a vector plus a vector. |
| CCOPY Subroutine | Copies vector X to Y. |
| CGBMV Subroutine | Performs matrix-vector operations with general banded matrices. |
| CGEMM Subroutine | Performs matrix-matrix operations on general matrices. |
| CGEMV Subroutine | Performs matrix-vector operation with general matrices. |
| CGERC Subroutine | Performs the rank 1 operation. |
| CGERU Subroutine | Performs the rank 1 operation. |
| CHBMV Subroutine | Performs matrix-vector operations using a Hermitian band matrix. |
| CHEMM Subroutine | Performs the rank 1 operation. |
| CHEMV Subroutine | Performs matrix-vector operations using a Hermitian band matrix. |
| CHER Subroutine | Performs the Hermitian rank 1 operation. |
| CHER2 Subroutine | Performs the Hermitian rank 2 operation. |
| CHER2K Subroutine | Performs Hermitian rank 2k operations. |
| CHERK Subroutine | Performs Hermitian rank k operations. |
| CHPMV Subroutine | Performs matrix-vector operations using a packed Hermitian matrix. |
| CHPR Subroutine | Performs the Hermitian rank 1 operation. |
| CHPR2 Subroutine | Performs the Hermitian rank 2 operation. |
| CROTG Subroutine | Constructs Givens plane rotation. |
| CSCAL Subroutine | Scales a vector by a constant. |
| CSROT Subroutine | Applies a plane rotation. |
| CSSCAL Subroutine | Scales a vector by a constant. |
| CSWAP Subroutine | Interchanges vectors X and Y. |
| CSYMM Subroutine | Performs matrix-matrix matrix operations on symmetric matrices. |
| CSYR2K Subroutine | Performs symmetric rank 2k operations. |
| CSYRK Subroutine | Perform symmetric rank k operations. |
| CTBMV Subroutine | Performs matrix-vector operations using a triangular band matrix. |
| CTBSV Subroutine | Solves system of equations. |
| CTPMV Subroutine | Performs matrix-vector operations on a packed triangular matrix. |
| CTPSV Subroutine | Solves systems of equations. |
| CTRMM Subroutine | Performs matrix-matrix operations on triangular matrices. |
| CTRMV Subroutine | Performs matrix-vector operations using a triangular matrix. |
| CTRSM Subroutine | Solves certain matrix equations. |
| CTRSV Subroutine | Solves system of equations. |
| calloc Subroutine | Provides a memory allocator. |
| can_change_color Subroutine | Color manipulation functions and external variables for color support. |
| catclose Subroutine | Closes a specified message catalog. |
| catgets Subroutine | Retrieves a message from a catalog. |
| catopen Subroutine | Opens a specified message catalog. |
| cbreak Subroutine | Puts the terminal into or out of CBREAK mode. |
| cbrt Subroutine | Computes square root and cube root functions. |
| ccsidtocs Subroutine | Provides conversion between coded character set IDs (CCSID) and code set names. |
| ceil Subroutine | Rounds floating-point numbers to floating-point integer values. |
| ceill Subroutine | Rounds floating-point numbers to floating-point integer values. |
| cfgetispeed Subroutine | Gets and sets input and output baud rates. |
| cfgetospeed Subroutine | Gets and sets input and output baud rates. |
| cfsetispeed Subroutine | Gets and sets input and output baud rates. |
| cfsetospeed Subroutine | Gets and sets input and output baud rates. |
| chacl Subroutine | Changes the permissions on a file. |
| chdir Subroutine | Changes the current directory. |
| _check_lock Subroutine | Conditionally updates a single word variable atomically. |
| chmod Subroutine | Changes file access permissions. |
| chown Subroutine | Changes file ownership. |
| chownx Subroutine | Changes file ownership. |
| chpass Subroutine | Changes file access permissions. |
| chroot Subroutine | Changes the effective root directory. |
| chssys Subroutine | Modifies the subsystem objects associated with the SubsystemName parameter. |
| ckuserID Subroutine | Authenticates the user. |
| ckuseracct Subroutine | Checks the validity of a user account. |
| _class Subroutine | Determines classifications of floating-point numbers. |
| class Subroutine | Determines classifications of floating-point numbers. |
| clear Subroutine | Clears a window. |
| clearerr Macro | Checks the status of a stream. |
| _clear_lock Subroutine | Stores a value in a single word variable atomically. |
| clearok Subroutine | Terminal output control subroutines. |
| clock Subroutine | Reports central processing unit (CPU) time used. |
| close Subroutine | Closes the file associated with a file descriptor. |
| closedir Subroutine | Performs operations on directories. |
| closelog Subroutine | Controls the system log. |
| clrtobot Subroutine | Erases the current line from the logical cursor position to the end of the window. |
| clrtoeol Subroutine | Erases the current line from the logical cursor position to the end of the line. |
| color_content Subroutine | Color manipulation functions and external variables for color support. |
| compare_and_swap Subroutine | Conditionally updates or returns a single word variable atomically. |
| compile Subroutine | Compiles and matches regular-expression patterns. |
| confstr Subroutine | Gets configurable variables. |
| conv Subroutine | Translates characters. |
| conv Subroutine (Japanese) | Translates predefined Japanese character classes. |
| copysign Subroutine | Computes certain binary floating-point arithmetic functions. |
| copywin Subroutine | Copies a region of a window. |
| cos Subroutine | Computes the trigonometric functions. |
| cosh Subroutine | Computes hyperbolic functions. |
| coshl Subroutine | Computes hyperbolic functions. |
| cosl Subroutine | Computes the trigonometric functions. |
| creat Subroutine | Opens a file for reading or writing. |
| creat64 Subroutine | Opens a file for reading or writing. |
| crypt Subroutine | Encrypts or decrypts data. |
| cs Subroutine | Compares and swaps data. |
| csid Subroutine | Returns the character set ID (charsetID) of a multibyte character. |
| cstoccsid Subroutine | Provides conversion between coded character set IDs (CCSID) and code set names. |
| ctermid Subroutine | Generates the path name of the controlling terminal. |
| ctime Subroutine | Converts the formats of date and time representations. |
| ctime_r Subroutine | Converts the formats of date and time representations. |
| ctype Subroutine | Classifies characters. |
| ctype Subroutine (Japanese) | Classify characters. |
| curs_set Subroutine | Sets the cursor visibility. |
| cuserid Subroutine | Gets the alphanumeric user name associated with the current process. |
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