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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’.
#include <stdio.h> #include <string.h> int main () { char string[55] ="This is a string for testing"; char *p; p = strchr (string,'i'); printf ("Character i is found at position %dn",p-string+1); printf ("First occurrence of character "i" in "%s" is" " "%s"",string, p); return 0; }
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” |
- If you want to find every occurrence of a character in a given string, you can use below C program.
#include <stdio.h> #include <string.h> int main () { char string[55] ="This is a string for testing"; char *p; int k = 1; p = strchr (string,'i'); while (p!=NULL) { printf ("Character i found at position %dn",p-string+1); printf ("Occurrence of character "i" : %d n",k); printf ("Occurrence of character "i" in "%s" is "%s" ""n",string, p); p=strchr(p+1,'i'); k++; } return 0; }
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” |
Other 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 to display example programs.
S.no |
String functions
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Description
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1 | strcat ( ) | Concatenates str2 at the end of str1. |
2 | strncat ( ) | appends a portion of string to another |
3 | strcpy ( ) | Copies str2 into str1 |
4 | strncpy ( ) | copies given number of characters of one string to another |
5 | strlen ( ) | gives the length of str1. |
6 | strcmp ( ) | Returns 0 if str1 is same as str2. Returns <0 if strl < str2. Returns >0 if str1 > str2. |
7 | strcmpi ( ) | Same as strcmp() function. But, this function negotiates case. “A” and “a” are treated as same. |
8 | strchr ( ) | Returns pointer to first occurrence of char in str1. |
9 | strrchr ( ) | last occurrence of given character in a string is found |
10 | strstr ( ) | Returns pointer to first occurrence of str2 in str1. |
11 | strrstr ( ) | Returns pointer to last occurrence of str2 in str1. |
12 | strdup ( ) | duplicates the string |
13 | strlwr ( ) | converts string to lowercase |
14 | strupr ( ) | converts string to uppercase |
15 | strrev ( ) | reverses the given string |
16 | strset ( ) | sets all character in a string to given character |
17 | strnset ( ) | It sets the portion of characters in a string to given character |
18 | strtok ( ) | tokenizing given string using delimiter |
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