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#include <stdio.h>
int main( void )
{ 
	int num;

	printf( "Give a 3-digit number: " );
	scanf("%d", &num);

	if ( num < -999 || num > 999 )
		puts( "*** error: out of range!" );

	else if ( num > -10 && num < 10 )
		puts( "1 digit" );

	else if ( num > -100 && num < 100 )
		puts( "2 digits" );

	else
		puts( "3 digits" );

	return 0;
}

#include <stdio.h>
int main( void )
{
	int num, count = 1;

	printf( "Give a number: " );
	scanf("%d", &num);

	while ( 0 != (num = num/10) )
		count++;

	printf( "%d digit(s)\n", count );

	return 0;
}

#include <stdio.h>
#include <stdbool.h>

int main( void )
{
	int num, count = 1;
	bool isvalid;

	printf( "Give a number: " );
	isvalid = ( 1 == scanf("%d", &num) );

	while ( 0 != (num = num/10) )
		count++;

	printf( "%d digit(s)\n", isvalid ? count : 0 );

	return 0;
}