seminar string functions

8/8/2019 SEMINAR String Functions

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By Team-1

Prasanna A

Alka Mary Abraham

Minimol T KJacob Tisson


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SYNTAX

char *strcat(char *dest, const char *src);

DESCRIPTION

strcat() is used to concatenate a null-terminated string to end of

another string variable.

This is equivalent to pasting one string onto the end of another,

overwriting the null terminator.

There is only one common use for strcat().

The strcat function concatenates or appends source to destination. All

characters from source are copied including the terminating character.


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` char S[25] = "world!";

` char D[25] = "Hello, ";

` Concatenating the whole string S onto D:` strcat(D, S);


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` Returned String : HelloHellooo

` Concatenated String : HelloHellooo


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SYNTAX

char *strncat(char *s1, const char *s2, size_t n);

DESCRIPTION` The strncat() function appends up to n characters from

string s2 to string s1 and then appends a terminating null

character.

`

The initial character ofs2

overwrites the null character atthe end ofs1.

` Subsequent characters in s2 are appended to s1 until either

the end of s2 is reached or n characters have been copied.


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` If copying takes place between objects that overlap, the behavior is

undefined.

` The function strncat() does not allocate any storage. The caller must

insure that the buffer pointed to by s1 is long enough to hold the added

characters.

DESCRIPTIONOF Strncat()


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#include

int main()

{

char string1[20];char string2[20];

strcpy(string1, "Hello");

strcpy(string2, "Hellooo");

printf("Returned String : %s\n", strncat(string1,string2,4));

printf("Concatenated String : %s\n", string1 );

return 0;

}


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` Returned String : HelloHell

` Concatenated String : HelloHell


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SYNTAX

char *strchr(const char *s, intc);

DESCRIPTION

` The strchr() function shall locate the first occurrence ofc

(converted to a char) in the string pointed to by s.

` The terminating null byte is considered to be part of thestring.

` The strchr() function returns a pointer to the first

occurrence of character c located within s.


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#include #include intmain()

{char s[10] = Locate";char *pos = strchr(s, a');

if(pos)printf("Character a' is found at position %d.\n", pos+1);

elseprintf("Character a is not found.\n");return 0;

}


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` Character a' is found at position 4.


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SYNTAX

size_t strspn(const char *s1, const char *s2);

DESCRIPTION

` The strspn() function computes the length of the maximum initial

segment of the string s1 that consists entirely of characters from the

string s2.

` Its purpose is to determine the size, location, and existence of strings

in memory.


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` The strspn() function returns the index of the first character in str1

that doesn't match any character in str2.

EXAMPLE:

` Given s1= abcdef and s2 =abc, the function returns 3.


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` The portion of 'cabbage' containing only a, b, or c is

5 bytes long


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