This document provides an introduction to strings in C programming. It discusses that strings are arrays of characters terminated by a null character. It explains how to declare and initialize strings, and provides examples of simple string programs. It also lists common string functions like strlen(), strcpy(), and strcat(), and provides examples of using each function. The document is intended as a presentation on strings for C programming.

1. WELCOME TO MY PRESENTATION
AbdullahAlYeamin
Maruf
ID: 173-35-256

2. String in C programming Language

3. Introducing String
In C programming, array of characters is called a string.
• A string is terminated by a null character /0.
For example:

4. Declaration
Before we actually work with strings, we need to declare them first.
• Strings are declared in a similar manner as arrays. Only difference
is that, strings are
of char type.
• char s[5];
s[0] s[1] s[2] s[3] s[4]

5. Initiation of String
• In C, string can be initialized in a number of different ways.
• For convenience and ease, both initialization and declaration
are done in the same step.
• char c[] = "abcde";
OR
• char c[5] = "abcde";
c[0] c[1] c[2] c[3] c[4]
a b c d e

6. Simple String Program
#include <stdio.h>
int main()
{
char name[20];
printf("Enter name: ");
scanf("%s", name);
printf("Your name is %s.n", name);
return 0;
}

7. String Functions
strlen()
strcmp()
strcat()
strcpy()
strupr()
strlwr()
strrev()
NB: Before using these function using first #include<string.h> herder file.

8. Using strlen() function
#include <stdio.h>
#include <string.h>
int main ()
{
char str1[12] = "Hello";
int len ;
len = strlen(str1);
printf("The length of string: %dn", len );
return 0;
}

9. Using strcpy() function
#include <stdio.h>
#include <string.h>
int main ()
{
char str1[12] = "Hello";
char str3[12];
strcpy(str3, str1);
printf("strcpy( str3, str1) : %sn", str3 );
return 0;
}

10. Using strcat() function
#include <stdio.h>
#include <string.h>
int main ()
{
char str1[12] = "Hello";
char str2[12] = " World";
strcat( str1, str2);
printf("strcat( str1, str2): %sn", str1 );
return 0;
}

11. Thank You Everyone.