C – strchr() function

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strchr( ) function returns pointer to the first occurrence of the character in a given string. Syntax for strchr( ) function is given below.
char *strchr(const char *str, int character);

Example program for strchr() function in C:

In this program, strchr( ) function is used to locate first occurrence of the character ‘i’ in the string “This is a string for testing”. Character ‘i’ is located at position 3 and pointer is returned at first occurrence of the character ‘i’.

Output:

Character i is found at position 3
First occurrence of character “i” in “This is a string for testing” is “is is a string for testing”

Note: If you want to find each occurrence of a character in a given string, you can use below C program.

Output:

Character i is found at position 3
Occurrence of character “i” : 1
Occurrence of character “i” in “This is a string for testing” is “is is a string for testing”
Character i is found at position 6
Occurrence of character “i” : 2
Occurrence of character “i” in “This is a string for testing” is “is a string for testing”
Character i is found at position 14
Occurrence of character “i” : 3
Occurrence of character “i” in “This is a string for testing” is “ing for testing”
Character i is found at position 26
Occurrence of character “i” : 4
Occurrence of character “i” in “This is a string for testing” is “ing”

C String functions:

  • String.h header file supports all the string functions in C language. All the string functions are given below.
  • Click on each string function name below for detail description and example programs.
String functions
Description
strcat ( ) Concatenates str2 at the end of str1
strncat ( ) Appends a portion of string to another
strcpy ( ) Copies str2 into str1
strncpy ( ) Copies given number of characters of one string to another
strlen ( ) Gives the length of str1
strcmp ( ) Returns 0 if str1 is same as str2. Returns <0 if strl < str2. Returns >0 if str1 > str2
strcmpi ( ) Same as strcmp() function. But, this function negotiates case.  “A” and “a” are treated as same.
strchr ( ) Returns pointer to first occurrence of char in str1
strrchr ( ) last occurrence of given character in a string is found
strstr ( ) Returns pointer to first occurrence of str2 in str1
strrstr ( ) Returns pointer to last occurrence of str2 in str1
strdup ( ) Duplicates the string
strlwr ( ) Converts string to lowercase
strupr ( ) Converts string to uppercase
strrev ( ) Reverses the given string
strset ( ) Sets all character in a string to given character
strnset ( ) It sets the portion of characters in a string to given character
strtok ( ) Tokenizing given string using delimiter

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