isspace - cppreference.com (original) (raw)

| | | | | ---------------------- | | | | int isspace( int ch ); | | |

Checks if the given character is either

• A standard white-space character:

• Space (0x20, ' '),

• Form feed (0x0c, '\f'),

• Line feed (0x0a, '\n'),

• Carriage return (0x0d, '\r'),

• Horizontal tab (0x09, '\t'),

• Vertical tab (0x0b, '\v'),

• Or a locale-specific white-space character.

The behavior is undefined if the value of ch is not representable as unsigned char and is not equal to EOF.

[edit] Parameters

[edit] Return value

Non-zero value if the character is a whitespace character, zero otherwise.

[edit] Example

#include <ctype.h> #include <limits.h> #include <stdio.h>   int main(void) { for (int ndx = 0; ndx <= UCHAR_MAX; ++ndx) if (isspace(ndx)) printf("0x%02x ", ndx); }

Output:

0x09 0x0a 0x0b 0x0c 0x0d 0x20

[edit] References

• C23 standard (ISO/IEC 9899:2024):

• 7.4.1.10 The isspace function (p: TBD)

• C17 standard (ISO/IEC 9899:2018):

• 7.4.1.10 The isspace function (p: 147)

• C11 standard (ISO/IEC 9899:2011):

• 7.4.1.10 The isspace function (p: 202-203)

• C99 standard (ISO/IEC 9899:1999):

• 7.4.1.10 The isspace function (p: 183-184)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.3.1.9 The isspace function

[edit] See also