Strings Functions in C Programming. Taught in a very Interactive and creative way.

1. String Functions
In
C Programming

2. What is a string?

String is any group of characters. In
programming string is “Array” of characters.

For example:

Char name[5] = ”Sunny”
Location 0x9 0xA 0xB 0xC 0xD 0xE
Values S u n n y n
Char name[5]

3. String.h

This is a header file can be used in c/c++
programming.

This file consist of many string handling
functions. Some of them are
− strlen()
− Strcmp()
− Strcmpi()
− Strcpy()
− strcat()

4. strlen()

“Strlen” stands for “string length”. This function is
used when we need to find length of any string.

For example: we have a char string, name[10]
and stored value is “Sunny”.

Size of the array is 10. Means we can store
maximum 10 bytes of data. Or 10 characters. But
the stored value is Sunny, consist of 5 characters
only. Lets count with the help of strlen().

5. Strcmp()

This fuction is used to compare to strings.
Strcmp() use ASCII standard to compare two
strings.

For example: we have two strings

Char n[10]=”poonam”

Char m[10]=”sunny”

Strcmp() has two parameters.

strcmp(destination_string,source_string)

We will write: strcmp(n,m);

6. strcmpi()

This function also uses for comparing two
strings.

But the diffrence is, for this function both
“poonam” and “PoOnaM” is same. This will return
0 when we compare them

But in case of strcmp() it will not be the same.

Strcmpi() has two parameters.

strcmpi(destination_string,source_string)

We will write: strcmpi(n,m);

7. strcpy()

This function is used to copy one string to
another string.

For example we have two character arrays.

m[10]=”Sunny”, n[10];

Strcpy() has also two parameters.

strcppy(destination_string,source_string)

We will write: strcpy(n,m);

We will get: m[10]=”Sunny”, n[10]=”Sunny”

8. strcat()

This function is used to concate two strings each
other.

Strcat() has two parameters.

strcmp(destination_string,source_string)

We will write: strcat(n,m);

For if we have n[11]=”sunny ” and m[10]=”Leone”

After concate we will get “Sunny Leone”.

9. C Program File
STRINGS.C

10. C Program File
STRINGS.C