Question

In C programming

Write the implementation for the three functions described below. The functions are called from the provided main function. You may need to define additional “helper” functions to solve the problem efficiently.

1. Write a print_string function that prints the characters in a string to screen on- by-one.
2. Write a is_identical function that compares if two strings are identical. The functions is required to be case insensitive. Return 0 if the two strings are not identical and 1 if they are identical.
3. Write a is_palindrome function. The function is required to be case insensitive and should only consider the letters and the numbers in the input string, i.e., remove all fillers (see lecture slides). Using this definition, the string “Madam, I’m Adam!” is considered a palindrome. The function is required to return 1 if the string is a palindrome and otherwise 0. (See the lecture slides for helpful hints.)

void print_string(char str[]); int is_identical(char str1[],char str2[]); int is_palindrome(char str[]);

void main(){   char str1[] = "Hello World";   char str2[] = "Madam, I'm Adam!";   char str3[] = "hello world";

print_string(str1);   printf("\n");   print_string(str2);   printf("\n");

(is_identical(str1,str2)) ? printf("Identical!\n") : printf("No identical!\n");

(is_identical(str1,str3)) ? printf("Identical!\n") : printf("No identical!\n");

(is_palindrome(str1)) ? printf("Palindrome!\n") : printf("No palindrome!\n");   (is_palindrome(str2)) ? printf("Palindrome!\n") : printf("No palindrome!\n"); }

Answer 1

-----------------------------------------------------------------------------------------------------------------------------------------

1)function to print the string one-by-one:-

void print_string(char str[]){

int i,n=strlen(str); //strlen() is predefined in string.h header file

for(i=0;i<n;i++)

printf("%c",str[i]);

printf("\n");

}

--------------------------------------------------------------------------------------------------------------------------------------------------

2)Function to check whether two functions are identical or not

int is_identical(char str1[],char str2[]){

int i,n,m,c=0;

n=strlen(str1),m=strlen(str2);

if(n!=m) return 0;

else{

for(i=0;i<n;i++) //tolower,isalpha&isdigit functions are predefined in ctype.h header file

if(tolower(str1[i])!=tolower(str2[i])) //converting into lowercase since "case insensitive"

{ c=1; //that means character can be in any case(upper/lower)

break;}

if(c==0) return 1;

else return 0;}

}

------------------------------------------------------------------------------------------------------------------------------------

3)function to check whether the string is palindrome or not

int is_palindrome(char str[]){

int i,n=strlen(str),x=0,j=0,y=0;

for(i=0;i<n;i++) //counting number of alphabets and the digits in the string

if(isalpha(str[i])||isdigit(str[i]))

x++;

char tmp[x];

for(i=0;i<n;i++)

if(isalpha(str[i])||isdigit(str[i]))

tmp[j++]=tolower(str[i]);

for(i=0;tmp[i]!='\0';i++)

if(tmp[i]!=tmp[x-i-1])

{y=1;

break;

}

if(y==0)

return 1;

else return 0;

}