C Programming
C Programming
Guides, references and tools
Everything in the C Programming section, organized by topic.
Browse all →
DTData Types ExExamples FuFunctions OpOperators TNThings Not To Do VaVariables
Python
Python
Guides, references and tools
Everything in the Python section, organized by topic.
Browse all →
FuFunctions SSSequence Slicing StString
SQL
SQL
Guides, references and tools
Everything in the SQL section, organized by topic.
Browse all →
ClClause
Tools
Tools
Guides, references and tools
Everything in the Tools section, organized by topic.
Browse all →
BaBase64 CMCss Minifier HEHtml Encoder HMHtml Minifier JBJs Beautifier JMJs Minifier JFJson Formatter JJJson Js JTJson Tree JXJson Xml JDJwt Decoder UEUrl Encoder UGUuid Generator YJYaml Json
Go Back

Scroll Down to See All▾

abort abs asctime asctime_r asin assert atan atan2 atexit atof atoi atol bsearch btowc calloc catclose catgets catopen ceil clearerr clock cos cosh ctime ctime_r difftime div erf erfc exit exp fabs fclose fdopen feof ferror fflush fgetc fgetpos fgets fgetwc fgetws fopen fprintf fputc fputws fread free freopen frexp fscanf fseek fsetpos ftell fwide fwprintf fwrite fwscanf getc getchar getenv getwc getwchar gmtime gmtime_r hypot isalnum isalpha isascii isblank iscntrl isdigit isgraph islower isprint ispunct isspace isupper iswalnum iswalpha iswblank iswcntrl iswctype iswdigit iswgraph iswlower iswprint iswpunct iswspace iswupper iswxdigit isxdigit j0 j1 jn labs ldexp ldiv localeconv localtime localtime_r log log10 longjmp malloc mblen mbrlen mbrtowc mbsinit mbsrtowcs mbstowcs mbtowc memchr memcmp memcpy memmove memset mktime modf nextafter nextafterl nexttoward nexttowardl nl_langinfo perror pow printf putc putchar putenv puts putwc putwchar qsort quantexpd32 quantexpd64 quantexpd128 quantized32 quantized64 quantized128 samequantumd32 raise rand rand_r realloc regcomp regerror regexec regfree remove rename rewind scanf setbuf setjmp setlocale setvbuf signal sin sinh snprintf sprintf sqrt srand sscanf strcasecmp strcat strchr strcmp strcoll strcpy strcspn strerror strfmon strftime strlen strncasecmp strncat strncmp strncpy strpbrk strptime strrchr strspn strstr strtod strtod32 strtod64 strtod128 strtof strtok strtok_r strtol strtold strtoul strxfrm swprintf swscanf system tan tanh time time64 tmpfile tmpnam toascii tolower toupper towctrans towlower towupper ungetc ungetwc va_arg va_copy va_end va_start vfprintf vfscanf vfwprintf vfwscanf vprintf vscanf vsprintf vsnprintf vsscanf vswprintf vswscanf vwprintf vwscanf wcrtomb wcscat wcschr wcscmp wcscoll wcscpy wcscpy wcsftime wcslen wcsncat wcsncmp wcsncpy wcspbrk wcsptime wcsrchr wcsrtombs wcsspn wcsstr wcstod wcstod32 wcstod64 wcstod128 wcstof wcstok wcstol wcstold wcstombs wcstoul wcsxfrm wctob wctomb wctrans wctype wcwidth wmemchr wmemcmp wmemcpy wmemmove wmemset wprintf wscanf y0 y1 yn

Function Details : acos

doubleacos(double x) ;

Return Type : double

Double-precision floating point (±1.7E±308, ~15 decimal digits)

Read about return values of acos function .

1st Parameter Type : double

Double-precision floating point (±1.7E±308, ~15 decimal digits)

1st Parameter

Value between -1 and 1 whose arc cosine is computed

Read more about parameters of acos in parameters section

The acosfunction in C language Calculates the arc cosine of the specified number.

The acos function, also known as the inverse cosine function, takes a number between -1 and 1 and returns the angle whose cosine is equal to that number. The result is given in radians, within the range from 0 to π (0 to 180 degrees). If the input is outside the valid range, the function cannot calculate an angle and instead returns NaN, indicating an invalid result.

The acosfunction takes 1 parameter:

•
double `x`: Value between -1 and 1 whose arc cosine is computed

The acos function return value :

Returns the arc cosine of the input value, in radians, in the range [0, π]
If the input is outside the range [-1, 1], it returns NaN

Output

This example demonstrates the basic usage of the `acos` function with different input values within the valid range.