C library functions (Ctalk)

C library functions

C Library Functions

You can assign the result of a C library function to a Ctalk object, provided that the return type of the function has a corresponding Ctalk class.

All C functions must have prototypes. The library functions in this section already have their prototypes defined in the C library headers. If a function in a program does not have a prototype, Ctalk prints an error and exits.

Generally, if Ctalk has a method that is analogous to a C library function, you can use the method with Ctalk objects, although in many cases you can mix objects and C variables. Of course, you can still use any C library function with C data types.

There are some incompatibilities with more specialized libraries. For example, you should take care when using the X Window System Xt widgets in Ctalk programs, because the widget classes use the some of the same class names as the Ctalk library.

The following sections describe the C library functions that Ctalk can use directly.

• abs:
• acos:
• acosh-asinh-atanh:
• asctime:
• asin:
• atexit:
• atof:
• atoi:
• atol:
• atoll:
• calloc:
• cbrt:
• ceil:
• chdir:
• clock:
• copysign:
• cos:
• cosh:
• ctime:
• difftime:
• erf:
• erfc:
• exp:
• expm1:
• fabs:
• fclose:
• fegetround:
• feholdexcept:
• feof:
• ferror:
• fesetround:
• fetestexcept:
• fflush:
• fgetc:
• fgetpos:
• fgets:
• floor:
• fmod:
• fopen:
• fprintf:
• fputc:
• fputs:
• fread:
• free:
• freopen:
• frexp:
• fscanf:
• fseek:
• fsetpos:
• fstat:
• ftell:
• fwrite:
• getc:
• getchar:
• getcwd:
• getenv:
• getpid:
• gmtime-localtime:
• index-function:
• isalnum-isxdigit:
• labs:
• llabs:
• llrint:
• llround:
• log:
• log10:
• log1p:
• lrint:
• lround:
• malloc:
• memchr:
• memcmp:
• memcpy:
• memmove:
• memset:
• mkdir:
• modf:
• nearbyint:
• perror:
• pow:
• printf:
• raise:
• rand:
• realloc:
• remove:
• rename:
• rindex:
• rint:
• rmdir:
• round:
• scanf:
• sin:
• sinh:
• snprintf:
• sprintf:
• sqrt:
• srand:
• sscanf:
• strcat-strcpy:
• strchr:
• strcoll:
• strspn:
• strerror:
• strftime:
• strlen:
• strncat-strncpy:
• strpbrk:
• strrchr:
• strstr:
• strtod:
• strtok:
• strtoll:
• strxfrm:
• system:
• tan:
• tanh:
• tmpnam:
• tolower:
• toupper:
• trunc:
• ungetc:
• vfprintf:
• vfscanf:
• vprintf:
• vscanf:
• vsnprintf:
• vsprintf:
• vsscanf: