String handling Functions in C

• Every C compiler in String handling functions in C supports a large number of String Handling Library functions.
• When we use string library functions in our program then we have to specify #include <string.h> in our program. 

• The most commonly used String handling Functions in C are

strlen(): This function is used to find the length of the string, which means that it counts the number of characters in a string.

The syntax is strlen(string);

Ex: strlen(“Murthy”);

strcpy(): This function is used to copy the contents of one string to another.

The syntax is strcpy(string1, string2); where string2 is the source string and string1 is the target string.

Ex: char str1[20]=”Malya”, str2[20]=”Vijay”;

    strcpy(str1, str2);

     vijay

strncpy(): This function is used to copy the number of characters from string 2 to string 1.

The syntax is strncpy(string1,string2, n);

Ex: char str1[20], str2[20] = “sachin”;

strncpy(str1,str2, 4);

str1=sach 

str2=sachin

strlwr(): This function is used to convert the characters of a string from upper case to lower case.

The syntax is strlwr(string);

strlwr(“DHONI”);  dhoni

strupr(): This function is used to convert the characters of a string from lowercase to uppercase.

The syntax is strupr(string);

strupr(“dhoni”);  DHONI

strrev(): This function is used to display the characters of a string in reverse order.

The syntax is strrev(string);

strrev(“Murthy”); yhtruM

strcat(): This function is used to concatenate the two strings. Concatenation means adding the two strings.

The syntax is strcat(string1, string2);

where string2 is concatenated with string 1 and the result is stored in string1.

strcat(“Virat”, “Kohli”);

strncat(): This function is used to concatenate the specified number of characters of string 2  to string 1 and the result is stored in string 1.

The syntax is strncat(string1, string2, n);

strncat(“Sachin”, “Tendulkar”, 3);

strcmp(): This String handling Function in C used to compare the two strings which means that it checks whether the two strings are identical or not.

This function is used to compare the strings based upon the ASCII values of each character in the string.

The strcmp() function returns a value of zero or non-zero.

If it returns zero value the strings are identical. Otherwise, the strings are not identical.

The syntax is

strcmp(string1, string2);

strcmp(“MURTHY”, “MURTHY”);

strcmp(“abc”, ”abc”); 🡪0

strcmp(“JNTUH”, “JNTUK”); 🡪-3

strcmp(“JNTUK”, “JNTUH”); 🡪 3

stricmp(): This function is similar to strcmp() function. Except that it does not discriminate between the upper case letters and lower case letters.

The syntax is stricmp(string1, string2);

stricmp(“murthy”, “murthy”); 🡪0

strncmp(): This function is similar to strcmp() function. But it compares the two strings up to a specified number of characters.

The syntax is strncmp(“MURTHY”, “Murthy”, 3); 🡪 -32

strncmp(“rama”, “ramu”, 3); 🡪0

strstr(): This function is used to find the position of string 2 in string 1. If string 2 is not present in string 1 it returns a value -1.

The syntax is strstr(string1, string2);

  strstr(“ramaraju”, “raju”); 🡪4strstr(“sachin”, “chin”); 🡪2

FAQs on String handling Functions in C