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This section describes the following functions, macros and external variables:

• scanf - Formatted input from the standard input
• setbuf - Set input/output buffer
• setenv - Add or change environment variable
• setjmp - Set label for non-local jumps
• setlocale - Set/query locale
• setvbuf - Set input/output buffer
• signal - Signal processing control
• signbit - Macro to test the sign
• sin, sinf, sinl - Sine
• sinh, sinhf, sinhl - Hyperbolic sine
• sleep - Suspend a program for a fixed period of time
• snprintf - Formatted output to a string
• sprintf - Formatted output to a string
• sqrt, sqrtf, sqrtl - Square root
• srand - Initialize the random number generator
• sscanf - Formatted input from a string
• __STDC__ - Test for compliance with ANSI standard
• __STDC_ VERSION__ - Test for compliance with Amendment 1
• strcat - Concatenate strings
• strchr - First occurrence of a character in a string
• strcmp - Compare two strings
• strcoll - Compare two strings
• strcpy - Copy string
• strcspn - Compare strings and calculate segment length
• strerror - Return error message text
• strfill - Copy part of a string
• strftime - Locale-specific representation of date and time
• strlen - Determine length of a string
• strlower - Copy a string and convert to lowercase letters
• strncat - Concatenate strings
• strncmp - Compare two strings
• strncpy - Copy string
• strnlen - Determine length of a string up to a maximum length
• strpbrk - Search for a character in a string
• strptime - Convert a string into date and time
• strrchr - Last occurrence of a character in a string
• strspn - Compare strings and calculate segment length
• strstr - First occurrence of one string in another
• strtod, strtof, strtol - Convert a string into a floating-point number
• strtoimax - convert string to integer (intmax_t)
• strtok - Split a string into tokens
• strtol - Convert a string into a whole number (long int)
• strtoll - Convert a string into a whole number (long long int)
• strtoul - Convert a string into a whole number (unsigned long int)
• strtoull - Convert a string into a whole number (unsigned long long)
• strtoumax - convert string to integer (uintmax_t)
• strupper - Copy a string and convert to uppercase letters
• strxfrm - Transform a string
• swprintf - Formatted output to a wide character string
• swscanf - Formatted input from a wide character string
• system - Execute system command