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Dr. Siti Barirah Ahmad Anas

barirah@upm.edu.my03-89466439

Room A.04.89

ECC3101 COMPUTERPROGRAMMING

String

mailto:barirah@eng.upm.edu.mymailto:barirah@eng.upm.edu.my

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•  Tehno!o"y#riented

  •  Business Dri$en•  Sustainab!e De$e!opment•  %n$ironmenta!

&riend!y

   L   E

   A   R   N

   I   N   G

   O   U   T   C   O

   M   E•  To understand the onept o) strin" and

array

•  To de!are* initia!i+e* assi"n and aessstrin"

•

 To imp!ement (-strin" and harater)untions

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• A pointer-based strin" – Array o) haraters endin" ,ith a nu!!

terminator 0/

 – 0/ indiates strin" termination inmemory

• 'mp!emented either usin" – ointer synta1 – Array synta1

   I   N   T   R

   O   D   U

   C   T   I   O

   N

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char city[7] = “Dallas”; // array//syntax

char *pCity = “Dallas”; // pointer//syntax

• %ah reates se2uene o)haraters D/* a/* !/* !/* a/* s/*

0/

   D   E   C

   L   A   R   A   T   I   O   N

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cout

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• Strin" an be read )rom the5eyboard usin"

1" cin #R

#" cin"$etline(char array[]% intsi&e% char deli'itChar!

%.".

char city[)];cout

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%.". 7 cin"$etline(char array[]% intsi&e% char deli'itChar!

char city[)];

cout

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Function Description

int strlen(char *s1! Returns strin" !en"thchar strcpy(char *s1% constchar *s#!

(opies s7 to s. s $a!ue is returned

char strncpy(char *s1% constchar *s#% si&e3t n!

(opies at most n haraters in s7 tos. s $a!ue is returned

char strcat(char *s1% const

char *s#!

Append s7 to s. &irst harater o)

s7 o$er,rites nu!! o) s. s $a!ue isreturned

char strncat(char *s1% constchar *s#% si&e3t n!

Append at most n haraters o) s7to s. &irst harater o) s7o$er,rites nu!! o) s. s $a!ue isreturned

char strc'p(char *s1% const

char *s#!

Returns $a!ue !ess than 0* 0 or

"reater than 0* i) s s7* s s7or s : s7* respeti$e!y

char strnc'p(char *s1% constchar *s#% si&e3t n!

Returns $a!ue !ess than 0* 0 or"reater than 0* i) s s7* s s7or s : s7 ;)or the

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   E   !   A   M

   P   L   E  

   S   T   R   C

   P   "

4include

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4include

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   E   !   A   M

   P   L   E  

   S   T   R   C

   M   P

4include

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Function Description

isdi$it(a! Returns true i) a is a di"it

isalpha(a! Returns true i) a is a !etter

isalnu'(a! Returns true i) a is a !etter or a di"it

islo?er(a! Returns true i) a is a !o,erase !etter

isupper(a! Returns true i) a is an upperase !etter

tolo?er(a! Returns the !o,erase e2ui$a!ent o) a* i) a is anupperase !etter* other,ise returns itse!) 

toupper(a! Returns the upperase e2ui$a!ent o) a* i) a is a!o,erase !etter* other,ise returns itse!) 

   C   #

   A   R   A   C

   T   E   R

   F   U   N   C   T   I   O   N   S

R

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