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Predefine function of C in string.h library

Predefine function of C in string.h library .In the string.h header file there are lots of function define which we can use directly we makes our work easy. Some important function are as follow:-

1. strlen() :-
                      strlen() is a predefine function which is declare in string.h . By using strlen() we can find the length of the string.
Syntax:-  strlen( string_name );                                            
 
Example:-
#include<stdio.h>
#include<string.h>
int main()
{
   char s[]="CrackAlgo";
   int len;
   len=strlen(s);
   printf("Length of the string is %d",len);
   return 0;
}

Output:-

Length of the string is 14
 
2) strcpy():-
                      By using strcpy function we can copy a string into another string. It copies the contents of source string to destination string. 
Syntax:-   strcpy(destination_string , source_string );                                  
 
Example:-
#include<stdio.h>
#include<string.h>
int main()
{
   char s[]="CrackAlgo" ;
   char str[50];
   strcpy(str,s);
   printf("The source string is %s\n",s);
   printf("The copy string is %s",str);
   return 0;
}

Output:-

The source string is CrackAlgo
The copy string is CrackAlgo

3) strcmp():-

                     It compare the two strings .If both the string is equal then it return 0 otherwise return non-zero.
Syntax:-   strcpm(str1 , str2 );                               
 
Example:-
#include<stdio.h>
#include<string.h>
int main()
{
  char s1[]="CrackAlgo" ;
  char s2[]="AlgoCrack";
  int ans;
  ans=strcmp(s1,s2);
  printf(" The value return by strcmp is %d",ans);
  return 0;
}

Output:-

Since both the strings are not equal to it will return an non-zero value. 
The value return by strcmp is -21

4) strcat():-

                It concatenates the two strings . In this we pass two function and it concatenate the second argument to the first argument .
Syntax:-     strcat(str1 ,str2 );                                                                  
 
Example:-
#include<stdio.h>
#include<string.h>
int main()
{
   char s1[100]="This is " ;
   char s2[]="CrackAlgo.com";
   strcat(s1,s2);
   printf("Final string is ' %s '",s1);
   return 0;
}

Output:-

Final string is ' This is CrackAlgo.com '

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