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Functions isdigit[edit | edit source] Syntax

#include <cctype>
int isdigit( int ch );

The function isdigit() returns non-zero if its argument is a digit between 0 and 9. Otherwise, zero is returned.

char c;
scanf( "%c", &c );
if( isdigit(c) )
  printf( "You entered the digit %c\n", c );

Related topics: isalnum - isalpha - iscntrl - isgraph - isprint - ispunct - isspace - isxdigit

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