C string functions; In this tutorial, i am going to show you string functions in c programming language with examples.
String Functions in C
Here, i will teach you about string functions in c: is as follow:
- What are string functions in C
- List of String Functions in C
- Examples of String Functions in C
- C program to copy one string to another
- C program for concatenate two strings
- C program to find the length of String using strlen()
- C program to reverse a string using strrev
- C program to compare two strings using strcmp
- C program to convert string in lower case
What are string functions in C
String functions are used to manipulate a string in the C programming language.
For example; If you want to get the length of the string in the C program. For this, you have to use strlen() string function.
List of String Functions in C
There are list of string functions in c; as follows:
| Function | Syntax (or) Example | Description |
|---|---|---|
| strcpy() | strcpy(string1, string2) | Copies string2 value into string1 |
| strncpy() | strncpy(string1, string2, 5) | Copies first 5 characters string2 into string1 |
| strlen() | strlen(string1) | returns total number of characters in string1 |
| strcat() | strcat(string1,string2) | Appends string2 to string1 |
| strncat() | strncpy(string1, string2, 4) | Appends first 4 characters of string2 to string1 |
| strcmp() | strcmp(string1, string2) | Returns 0 if string1 and string2 are the same; less than 0 if string1<string2; greater than 0 if string1>string2 |
| strncmp() | strncmp(string1, string2, 4) | Compares first 4 characters of both string1 and string2 |
| strcmpi() | strcmpi(string1,string2) | Compares two strings, string1 and string2 by ignoring case (upper or lower) |
| stricmp() | stricmp(string1, string2) | Compares two strings, string1 and string2 by ignoring case (similar to strcmpi()) |
| strlwr() | strlwr(string1) | Converts all the characters of string1 to lower case. |
| strupr() | strupr(string1) | Converts all the characters of string1 to upper case. |
| strdup() | string1 = strdup(string2) | Duplicated value of string2 is assigned to string1 |
| strchr() | strchr(string1, ‘b’) | Returns a pointer to the first occurrence of character ‘b’ in string1 |
| strrchr() | ‘strrchr(string1, ‘b’) | Returns a pointer to the last occurrence of character ‘b’ in string1 |
| strstr() | strstr(string1, string2) | Returns a pointer to the first occurrence of string2 in string1 |
| strset() | strset(string1, ‘B’) | Sets all the characters of string1 to given character ‘B’. |
| strnset() | strnset(string1, ‘B’, 5) | Sets the first 5 characters of string1 to the given character ‘B’. |
| strrev() | strrev(string1) | It reverses the value of string1 |
Examples of String Functions in C
- C program to copy one string to another
- C program for concatenate two strings
- C program to find the length of String using strlen()
- C program to reverse a string using strrev
- C program to compare two strings using strcmp
- C program to convert string in lower case
C program to copy one string to another
Using the string strcpy() function; you can copy the contents of the string one into another string in c. See the following example:
#include <stdio.h>
#include <string.h>
int main () {
char str1[12] = "Hello";
char str2[12] = "World";
char str3[12];
int len ;
/* copy str1 into str3 */
strcpy(str3, str1);
}
C program for concatenate two strings using strcat
Using the string strcat() function; you can concatenate or add two strings in c. See the following example:
#include <stdio.h>
#include <string.h>
int main () {
char str1[12] = "Hello";
char str2[12] = "World";
strcat( str1, str2);
printf("The concatenated string is : %s",str1);
}
C program to find the length of String using strlen()
Using the string strlen() function; you can find the length of given strings in c program. See the following example:
#include <stdio.h>
#include <string.h>
int main () {
char str1[12] = "Hello";
int len ;
len = strlen(str1);
printf("strlen(str1) : %d\n", len );
}
C program to reverse a string using strrev
Using the string strrev() function; you can reverse a given string in the c program. See the following example:
1#include <stdio.h>
#include <string.h>
int main()
{
char str[40]; // declare the size of character string
printf (" \n Enter a string to be reversed: ");
scanf ("%s", str);
// use strrev() function to reverse a string
printf (" \n After the reverse of a string: %s ", strrev(str));
return 0;
}
C program to compare two strings using strcmp
Using the string strcmp() function; you can compare two strings in the c program. See the following example:
#include<stdio.h>
#include <string.h>
int main(){
char str1[10],str2[10];
gets(str1);
gets(str2);
if(strcmp(str1,str2)==0)
printf("Strings :equal");
else
printf("Strings: not equal");
}
C program to convert string in upper case
Using the string strupr() function; you can convert the string into upper case in the c program. See the following example:
#include<stdio.h>
#include <string.h>
int main(){
char str[20];
gets(str);
printf("String is: %s",str);
printf("\nUpper String is: %s",strupr(str));
}
C program to convert string in lower case
Using the string strlwr() function; you can convert the string into lower case in the c program. See the following example:
#include<stdio.h>
#include <string.h>
int main(){
char str[20];
gets(str);
printf("String is: %s",str);
printf("\nUpper String is: %s",strlwr(str));
}