Example : Find the length of given string in C using string function [strlen()].

#include <stdio.h>
#include <string.h>
int main()
{
     char str[30] = "Codershelpline";
     int length;
     length=strlen(str);
     printf("Length of given string is =  %d", length);
     return 0;
}
Output :
Length of given string is =  14

---------  OR  ----------
#include <stdio.h>
#include <string.h>
int main()
{
     char str[30] = "Codershelpline";     
     printf("Length of given string is =  %d", strlen(str));
     return 0;
}
Output :
Length of given string is =  14

---------  OR  ----------
#include <stdio.h>
int main()
{
     char str[30] = "Codershelpline";
     int length;
     length=sizeof(str);
     printf("Length of given string is =  %d", length);
     return 0;
}
NB : sizeof() gives the length of memory occupied by the variable.
Output :
Length of given string is =  30

---------  OR  ----------
#include <stdio.h>
int main()
{
     char str[30] = "Codershelpline";     
     printf("Length of given string is =  %d", sizeof(str));
     return 0;
}
Output :
Length of given string is =  30

Example : Find the length of given string in C using string function [sprintf()].

#include<stdio.h>  
int main()  
{  
	 char x[20];  
	 int n=sprintf(x,"codershelpline");  
	 printf("The length of the String is = %d",n);  
	 return 0;
 }
Output :
14  

Example : How to copy one string contents into another empty string in C using string function [strcpy()].

#include <stdio.h>
#include <string.h>
int main()
{
     char str1[30] = "Codershelpline";
     char str2[30] ;     
     
     strcpy(str2,str1);
     //strcpy(str2,"Codershelpline"); 
     
     printf("String after Copying is = %s", str2);
     return 0;
}
Output :
String after Copying is = Codershelpline

---------  OR  ----------
#include <stdio.h>
#include <string.h>
int main()
{
     char str1[30] = "Codershelpline";
     char str2[30] = "Hello India";     
     
     strcpy(str2,str1);
     //strcpy(str2,"Codershelpline"); 
     
     printf("String after Copying is = %s", str2);
     return 0;
}
Output :
String after Copying is = Codershelpline

Example : How to copy one string contents up to desired length into another empty string in C using string function [strncpy()].

#include <stdio.h>
#include <string.h>
int main()
{
     char str1[30] = "Codershelpline";
     char str2[30] ;     
     
     strncpy(str2,str1,5); 
     
     printf("String after Copying is = %s", str2);
     return 0;
}
Output :
String after Copying is = Coder   #

---------  OR  ----------
#include <stdio.h>
#include <string.h>
int main()
{
     char str1[30] = "Codershelpline";
     char str2[30] ;     
     
     strncpy(str2,str1,17); 
     
     printf("String after Copying is = %s", str2);
     return 0;
}
Output :
String after Copying is = Codershelpline\0\0\0 
NB : \0 does not appear in the output.   

Example : How to duplicate the given string in C using string function [strdup()].

#include <stdio.h>
#include <string.h>

int main()
{
    char *ptr1 = "Codershelpline";
    char *ptr2;
    ptr2 = strdup(ptr1);
 
    printf("The Duplicate String is = %s", ptr2);
    
    return 0;
}
Output :
The Duplicate String is = Codershelpline

Example : How to reverse the given string in C using string function [strrev()].

#include<stdio.h>
#include<conio.h>
#include<string.h> 

void main() 
 {    
    char str[30];
    printf("Enter String Value = ");
    gets(str);
    strrev(str);
    
    printf("The Reversed String is = ");
    puts(str);
    
    getch(); 
 }

Example : How to convert uppercase/capital letters into lowercase/small letters of the given string in C using string function [strlwr()].

#include<stdio.h>
#include<conio.h>
#include<string.h> 

void main() 
 {    
    char str[30];
    printf("Enter String Value = ");
    gets(str);
    strlwr(str);
    
    printf("The Reversed String is = ");
    puts(str);
    
    getch(); 
 }

Example : How to convert lowercase/small letters into uppercase/capital letters of the given string in C using string function [strupr()].

#include<stdio.h>
#include<conio.h>
#include<string.h> 

void main() 
 {    
    char str[30];
    printf("Enter String Value = ");
    gets(str);
    strupr(str);
    
    printf("The Reversed String is = ");
    puts(str);
    
    getch(); 
 }

Example : How to compare two given string in C using string function [strcmp()].

#include <stdio.h>
#include <string.h>
int main()
{
     char str1[20] = "Codershelpline";
     char str2[20] = "Codershelpline";
     int value;
     value = strcmp(str1, str2);
     
     if (value==0)
      {
        printf("Both Strings are Equal");
      }
     else
      {
         printf("Both String are Different");
      }
     return 0;
}

Output :
Both Strings are Equal

---------  OR  ----------
#include <stdio.h>
#include <string.h>
int main()
{
     char str1[20] = "Codershelpline";
     char str2[20] = "Codershelpline";
     if (strcmp(str1, str2) ==0)
       {
        printf("Both Strings are Equal");
       }
     else
       {
         printf("Both String are Different");
       }
     return 0;
}
Output :
Both Strings are Equal

---------  OR  ----------
#include <stdio.h>
#include <string.h>
int main()
{
     char str1[20] = "Codershelpline";
     char str2[20] = "codershelpline";
     if (strcmp(str1, str2) ==0)
       {
        printf("Both Strings are Equal");
       }
     else
       {
         printf("Both String are Different");
       }
     return 0;
}
Output :
Both Strings are Different

---------  OR  ----------
#include <stdio.h>
#include <string.h>
int main()
{
     char str1[20] = "Welcome India";
     char str2[20] = "Welcome";
     int value;
     value=strcmp(str1, str2);
     
     if (value == 0)
       {
        printf("Both Strings are Equal");
       }
     else if(value>0)
       {
        printf("Both String are Different and First String has larger length");
       }
     else
       {
        printf("Both String are Different and Second String has larger length");
       }
     return 0;
}

Output :
Both String are Different and First String has larger length

---------  OR  ----------
#include <stdio.h>
#include <string.h>
int main()
{
     char str1[20] = "Welcome ";
     char str2[20] = "Welcome India";
     int value;
     value=strcmp(str1, str2);
     
     if (value == 0)
     {
        printf("Both Strings are Equal");
     }
	 else if(value<0)
    {
         printf("Both String are Different and  Second String has larger length");
    }
    else
    {
         printf("Both String are Different and First String has larger length");
    }
     return 0;
}
Output :
Both String are Different and Second String has larger length

Example : How to compare two given string ignoring case in C using string function [stricmp()].

#include <stdio.h>
#include <string.h>
int main()
{
     char str1[20] = "Codershelpline";
     char str2[20] = "codershelpline";
     int value;
     value=stricmp(str1, str2);
     
     if (value == 0)
     {
        printf("Both Strings are Equal");
     }
	 else
    {
         printf("Both String are Different ");
    }
    
     return 0;
}
Output :
Both Strings are Equal

Example : How to compare two string upto given length in C using string function [strncmp()].

#include <stdio.h>
#include <string.h>
int main()
{
     char str1[20] = "Welcome ";
     char str2[20] = "Welcome India";
     int value;
     value=strncmp(str1, str2, 7);
     
     if (value == 0)
       {
        printf("Both Strings are Equal");
       }
     else 
       {
         printf("Both String are Different");
       }    
     return 0;
}
Output :
Both Strings are Equal

---------  OR  ----------
#include <stdio.h>
#include <string.h>
int main()
{
     char str1[20] = "Welcome ";
     char str2[20] = "Welcome India";
     int value;
     value=strncmp(str1, str2, 9);
     
     if (value == 0)
       {
        printf("Both Strings are Equal");
       }
     else 
       {
         printf("Both String are Different");
       }    
     return 0;
}
Output :
Both String are Different

Example : How to concatenate two given strings as one in C using string function [strcat()].

#include <stdio.h>
#include <string.h>
int main()
{
     char str1[30] = "Coders";
     char str2[30] = "helpline";
     strcat(str1,str2);
     printf("String after concatenation is = %s", str1);

     return 0;
}
Output :
String after concatenation is = Codershelpline

Example : How to concatenate two given strings as one and store in another string in C using string function [strcat()].

#include <stdio.h>
#include <string.h>
int main()
{
     char str1[30] = "Coders";
     char str2[30] = "helpline";
     char str3[30] ;
     
     strcat(str1,str2);
     
     strcpy(str3,str1);
     
     printf("String after concatenation is = %s", str3);
     return 0;
}
Output :
String after concatenation is = Codershelpline

Example : How to concatenate two given strings as one upto given length in C using string function [strncat()].

#include <stdio.h>
#include <string.h>
int main()
{
     char str1[30] = "Coders";
     char str2[30] = "helpline";     
     
     strncat(str1,str2,4); 
     
     printf("String after concatenation is = %s", str1);
     return 0;
}

Output :
String after concatenation is = Codershelp

Example : How to display remaining string from a first occurrence of searching character  in C using string function [strchr()].

#include <stdio.h>
#include <string.h>
int main()
{
    char str[] = "Codershelpline"; 
    char ch = 'l'; 
    char* n;   
    
    n = strchr(str, ch); 
  
    printf("String from last searching location of %c is : %s \n",ch, n); 
    
    return (0); 
}
Output :
String from last searching location of l is : lpline

------  OR  ------
#include <stdio.h>
#include <string.h>

int main ()
{   
  char str[55] ="This is Your Site, Please Use it Once.";
  char *ptr;
  char ch='Y';
  ptr = strchr (str,ch);
 
  printf ("Character %c is Found at Position %d\n",ch,ptr-(str+1));
  printf ("First Occurrence of Character \"%c\" in \"%s\" is \"%s\" ",ch,str, ptr);   
  return 0;
}
Output :
Character Y is Found at Position 7.
First Occurrence of Character "Y" in "This is Your Site, Please Use it Once." is "Your Site, Please Use it Once."

Example : How to display remaining string from a last occurrence of character (in reverse order searching i.e. started from end) in C using string function [strrchr()].

#include <stdio.h>
#include <string.h>
int main()
{
    char str[] = "Codershelpline"; 
    char ch = 'd'; 
    char* n;    
    n = strrchr(str, ch); 
  
    printf("String from last searching location of %c is : %s \n",ch, n); 
    
    return (0); 
}
Output :
String from last searching location of d is : dershelpline

---------  OR  ----------
#include <stdio.h>
#include <string.h>
int main()
{
    char str[] = "Codershelpline"; 
    char ch = 'l'; 
    char* n;   
    
    n = strrchr(str, ch); 
  
    printf("String from last searching location of %c is : %s \n",ch, n); 
    
    return (0); 
}

Output :
String from last searching location of l is : line

NB :
strrchr() function locates the last occurrence of a character in a string and returns as a pointer.

Example : How to search first occurrence of word in a string from a given string in C using string function [strstr()].

#include <stdio.h>
#include <string.h>
int main ()
{
  char str1[55] ="This is Your Choice Site";
  char *ptr;
  char str2[]="Choice";
  
  ptr = strstr (str1,str2);
  
  if(ptr)
    {
     printf("Searched String \"%s\" Found\n",str2 );
     printf ("First Occurrence of Searched String \"%s\" in Sentence\"%s\" is \"%s\"",str2,str1, 
             ptr);
    }
  else 
     printf("Searched String Not Found\n" );
  return 0;
}
Output :
Searched String "Choice" Found
First Occurrence of Searched String "Choice" in Sentence "This is Your Choice Site" is "Choice Site"

NB : Returns pointer to the first occurrence of the searched string in a given string.

Example : How to replace the string with given character using string function [strset()].

#include<stdio.h>
#include<string.h>
int main()
{
   char str[20] = "Codershelpline";
   
   printf("Original String is = %s\n", str);
   printf("String after Replacing with given Character is %s",strset(str,'$'));   
   return 0;
}
Output :
Original String is = Codershelpline
String after Replacing with given Character is $$$$$$$$$$$$$$

Example : How to replace the string upto desired length with given character using string function [strnset()].

#include<stdio.h>
#include<string.h>
int main()
{
   char str[20] = "Codershelpline";
   
   printf("Original String is = %s\n", str);
   printf("String after Replacing with given Character is %s",strnset(str,'$',6));   
   return 0;
}

Output :
Original String is = Codershelpline
String after Replacing with given Character is $$$$$$helpline

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Categories: C

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