String function in C Language

Hello friends how are you, today in this blog i will teach you what is string function, different types of string function, how string function works and many programs of string function in a very simple way.

Let's start

1.String is a collection of character.

2.C does not support string data type therefore char data type is used to make string .

3.String in c is stored in single dimension character array.

4.There are many predefined string function in C library.

5.All the string functions are predefined in string.h header file.

👉String Function

Function name	Description
strlen(s);	It is used to get the length of string.
strcpy(s1,s2);	It is used to copy the string here string s2 is copied into string s1.
strcat(s1,s2);	It is used to add two string here string s2 concatenates at the end of string s1.
strcmp(s1,s2);	1.It is used to compare two string. 2.This function returns 0 if string s1 and string s2 are same. 3.This function returns negative value if s1<s2. 4.This function returns positive value if s1 >s2 .
strrev(s);	It is used to reverse the string.
strupr(s);	It is used to convert all the character into upper alphabet.
strlwr(s);	It is used to convert all the character into lower alphabet.
strcmpi(s1,s2);	It is also used to compare two string but it ignores the case sensitivity means 'a' and 'A' are treated as same.

👉strlen()

It is used to find the length of the Specified string.

#include<stdio.h>
#include<conio.h>
#include<string.h>
int main()
{
char name[200]="Easy";
printf("%d",strlen(name));
return 0;
}

### Output ###
4
//because there is 4 character in Easy

👉strcpy()

It is used to copy one string into another.

It has two parameters.

#include<stdio.h>
#include<conio.h>
#include<string.h>
int main()
{
char name1[200]="Radha";
char name2[200]="Rani";
strcpy(name1,name2);
printf("%s",name1);
return 0;
}

### Output ###
Rani

👉strcmp()

It is used to compare one string with another.

It returns zero if both strings are same otherwise returns non-zero.

#include<stdio.h>
#include<conio.h>
#include<string.h>
int main()
{
char s1[200]="Easy";
char s2[200]="Easy";
if(strcmp(s1,s2)==0)
  {
  printf("string s1 and string s2 are same.");
  }
  else
  {
  printf("string s1 and string s2 are not same.");
  }
return 0;
}

### Output ###
string s1 and string s2 are same

👉strcat()

It is used to concatenate one string with another.

#include<stdio.h>
#include<conio.h>
#include<string.h>
int main()
{
char s1[200]="Easy";
char s2[200]=" Softwares";
printf("%s",strcat(s1,s2));
return 0;
}

### Output ###
Easy Softwares

👉strrev()

It is used to reverse the  string .

#include<stdio.h>
#include<conio.h>
#include<string.h>
int main()
{
  char s[200]="ABCD";
  printf("%s",strrev(s));
  return 0;
}

### Output ###
DCBA

👉strupr()

It is used to convert only lowercase alphabet into uppercase.

#include<stdio.h>
#include<conio.h>
#include<string.h>
int main()
{
  char s[200]="Easy";
  printf("%s",strupr(s));
  return 0;
}

### Output ###
EASY

👉strlwr()

It is used to convert only uppercase alphabet into lowercase.

#include<stdio.h>
#include<conio.h>
#include<string.h>
int main()
{
  char s[200]="Easy";
  printf("%s",strlwr(s));
  return 0;
}

### Output ###
easy

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