Assignment 1
1. a) List out various string functions in C and explain each function with example
2. Explain the concept of one dimensional and two dimensional arrays with example
Assignment 1
List out various string functions in C and explain each function with example
C String Functions
There are many important string functions defined in "string.h" library.
No Function Description
.
1) strlen(string_name) returns the length of string name.
2) strcpy(destination, copies the contents of source string to destination
source) string.
3) strcat(first_string, concats or joins first string with second string. The
second_string) result of the string is stored in first string.
4) strcmp(first_string, compares the first string with second string. If both
second_string) strings are same, it returns 0.
5) strrev(string) returns reverse string.
6) strlwr(string) returns string characters in lowercase.
7) strupr(string) returns string characters in uppercase.
C String Length: strlen() function
The strlen() function returns the length of the given string. It doesn't count null
character '\0'.
1. #include<stdio.h>
2. #include <string.h>
3. int main(){
4. char ch[20]={'j', 'a', 'v', 'a', 't', 'p', 'o', 'i', 'n', 't', '\0'};
5. printf("Length of string is: %d",strlen(ch));
6. return 0;
7. }
Output:
Length of string is: 10
C Copy String: strcpy()
The strcpy(destination, source) function copies the source string in destination.
1. #include<stdio.h>
2. #include <string.h>
3. int main(){
4. char ch[20]={'j', 'a', 'v', 'a', 't', 'p', 'o', 'i', 'n', 't', '\0'};
5. char ch2[20];
6. strcpy(ch2,ch);
7. printf("Value of second string is: %s",ch2);
8. return 0;
9. }
Output:
Value of second string is: javatpoint
C String Concatenation: strcat()
The strcat(first_string, second_string) function concatenates two strings and result is
returned to first_string.
1. #include<stdio.h>
2. #include <string.h>
3. int main(){
4. char ch[10]={'h', 'e', 'l', 'l', 'o', '\0'};
5. char ch2[10]={'c', '\0'};
6. strcat(ch,ch2);
7. printf("Value of first string is: %s",ch);
8. return 0;
9. }
Output:
Value of first string is: helloc
C Compare String: strcmp()
The strcmp(first_string, second_string) function compares two string and returns 0 if
both strings are equal.
Here, we are using gets() function which reads string from the console.
1. #include<stdio.h>
2. #include <string.h>
3. int main(){
4. char str1[20],str2[20];
5. printf("Enter 1st string: ");
6. gets(str1);//reads string from console
7. printf("Enter 2nd string: ");
8. gets(str2);
9. if(strcmp(str1,str2)==0)
10. printf("Strings are equal");
11. else
12. printf("Strings are not equal");
13. return 0;
14. }
Output:
Enter 1st string: hello
Enter 2nd string: hello
Strings are equal
Next TopicC strrev()
C Reverse String: strrev()
The strrev(string) function returns reverse of the given string. Let's see a simple
example of strrev() function.
1. #include<stdio.h>
2. #include <string.h>
3. int main(){
4. char str[20];
5. printf("Enter string: ");
6. gets(str);//reads string from console
7. printf("String is: %s",str);
8. printf("\nReverse String is: %s",strrev(str));
9. return 0;
10. }
Output:
Enter string: javatpoint
String is: javatpoint
Reverse String is: tnioptavaj
C Reverse String: strrev()
The strrev(string) function returns reverse of the given string. Let's see a simple
example of strrev() function.
1. #include<stdio.h>
2. #include <string.h>
3. int main(){
4. char str[20];
5. printf("Enter string: ");
6. gets(str);//reads string from console
7. printf("String is: %s",str);
8. printf("\nReverse String is: %s",strrev(str));
9. return 0;
10. }
Output:
Enter string: javatpoint
String is: javatpoint
Reverse String is: tnioptavaj
C String Uppercase: strupr()
The strupr(string) function returns string characters in uppercase. Let's see a simple
example of strupr() function.
1. #include<stdio.h>
2. #include <string.h>
3. int main(){
4. char str[20];
5. printf("Enter string: ");
6. gets(str);//reads string from console
7. printf("String is: %s",str);
8. printf("\nUpper String is: %s",strupr(str));
9. return 0;
10. }
Output:
Enter string: javatpoint
String is: javatpoint
Upper String is: JAVATPOINT
