String functions

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strncpy()

strncat()

strstr()

strlen()

—Predefined function defined in string.h .

——Returns the length of string .

—Syntax:  returntype  strlen(string_var_name)

#include<stdio.h>

main()

{

    char ar[20]=“Arvind”;

    printf(“%d”,strlen(ar));

 }

strcmp()

—Used to compare two strings characterwise

——syntax: strcmp(s1,s2)

#include<stdio.h>

#include<string.h>

void main()

{  int i;

  char name[20]=“home";

  char name1[20]="sweet";

  i=strcmp(name,name1);   // name<name1

  printf("%d”,i);

} 

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strcpy()

—Defined in string.h

—Used to copy one string to another string

Syntax: strcpy(string1,string2)

Ex

#include<stdio.h>

#include<string.h>

void main()

{   char name1[20];

    char name2[20]=“harry”;

    strcpy(name1,name2);

    printf(“%s”,name1);

 } 

harry

strcat( )

—Also defined in string.h

——Syntax:strcat(string1,string2)

—Append string2 at the end of string1.

Ex.

#include<stdio.h>

#include<string.h>

main( )

{int i;

  char name1[20]="home";

  char name2[20]="sweet";

  strcat(name2,name1);  

  printf("%s",name1);   }

sweethome