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STANDARD LIBRARY A STRING FUNCTION

With every c compiler, a large set of useful string handling library function are provided.

In c we have few function that we can use without creating them.

Function

Use

Strien

Find length of a string

Striwr

Converts a string to lower case

Strupr

Converts a string to upper case

Strcat

Append one string at the end of another

Strncat

Append first character of string at the end of another

Strcpy

Copies a string into another

Strncpy

Copies first character of one string into another

Strcmp

Compare two string

Strncmp

Compare first character of two string

Strcmpi

Compare two string without regard to case(“I denotes that this function ignores case”)

Stricmp

Compose two string without regard to case

Strnicmp

Compose first character of two string without regard to case duplicates a string

Strdup

Duplicates a string

Strctr

Finds first accurence of a given character in a string.

Strrctr

Finds last accurence of a given character in a string.

Strstr

Finds first accurence of a given string in another string.

Strset

Sets all character of a string to a given character.

Strnset

Sets first n characters of a string to a given character.

Strrev

Reserve string.

Strlen-> this function count the number of character present in the string

Ex

#include<stdio.h>

#include<string.h>

int main()

{

  char array[]={“geeks with geeks”};

  int len1, len2;

  len1=strlen(array);

  len2=strlen(GWG);

  printf(“string %s length = %d/n”, array, len1);

  printf(“string %s length = %d/n”, GWG, len2);

  return 0;

}

Strcpy-> this function copies the content of one string in to another

#include<string.h>

int main()

{

  char source[]={“geeks with geeks”};

  char target[20];

  strcpy(target, source);

  printf(“source string= %s /n”, source);

  printf(“target string= %s /n”, target);

  return 0;

}

Output:

source string = geeks with geeks

target string = geeks with geeks

 

strcat-> this function add the source string in to end of target string

#include<string.h>

int main()

{

  char source[]={“vikas”};

  char target[]=”hello”;

  strcat(target, source);

  printf(“source string= %s /n”, source);

  printf(“target string= %s /n”, target);

  return 0;

}

Outout:

source string=vikas

target string = hello vikas

strcmp-> this function compare two string to find out where they are same or different

#include<string.h>

int main()

{

  char source[]={“vikas”};

  char target[]=”hello”;

  int I, j, k;

  i=Strcmp( source, “vikas”);

  j=strcmp(source, target);

  k=strcmp(source, “vikas boy”);

  printf(“%d %d %d”, I, j ,k);

  return 0;

}

Output: 04   -  32

summary

1.a string is nothing but array of character terminated by ‘\o’.

2.being an array all the characters of a string are stored in memory location.

3.thugh scan f is used to receive multi word string.

4.both print f and puts can handle multi word string.

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