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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
199093 changed files with 3378972 additions and 0 deletions
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10
Task/Determine-if-a-string-is-numeric/Objective-C/determine-if-a-string-is-numeric-1.m Normal file
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if( [[NSScanner scannerWithString:@"-123.4e5"] scanFloat:NULL] )
NSLog( @"\"-123.4e5\" is numeric" );
else
NSLog( @"\"-123.4e5\" is not numeric" );
if( [[NSScanner scannerWithString:@"Not a number"] scanFloat:NULL] )
NSLog( @"\"Not a number\" is numeric" );
else
NSLog( @"\"Not a number\" is not numeric" );
// prints: "-123.4e5" is numeric
// prints: "Not a number" is not numeric

9
Task/Determine-if-a-string-is-numeric/Objective-C/determine-if-a-string-is-numeric-2.m Normal file
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BOOL isNumeric(NSString *s)
{
NSScanner *sc = [NSScanner scannerWithString: s];
if ( [sc scanFloat:NULL] )
{
return [sc isAtEnd];
}
return NO;
}

25
Task/Determine-if-a-string-is-numeric/Objective-C/determine-if-a-string-is-numeric-3.m Normal file
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BOOL isNumericI(NSString *s)
{
NSUInteger len = [s length];
NSUInteger i;
BOOL status = NO;
for(i=0; i < len; i++)
{
unichar singlechar = [s characterAtIndex: i];
if ( (singlechar == ' ') && (!status) )
{
continue;
}
if ( ( singlechar == '+' ||
singlechar == '-' ) && (!status) ) { status=YES; continue; }
if ( ( singlechar >= '0' ) &&
( singlechar <= '9' ) )
{
status = YES;
} else {
return NO;
}
}
return (i == len) && status;
}