HackerRank Playing With Characters solution in C

In this tutorial, we are going to solve HackerRank Playing with characters problem in c and write a solution for this problem.

Objective

This challenge will help you to learn how to take a character, a string and a sentence as input in C.

To take a single character ch as input, you can use scanf("%c", &ch ); and printf("%c", ch) writes a character specified by the argument char to stdout

char ch;
scanf("%c", &ch);
printf("%c", ch);

This piece of code prints the character ch.

You can take a string as input in C using scanf(“%s”, s). But, it accepts string only until it finds the first space.

In order to take a line as input, you can use scanf("%[^\n]%*c", s); where s is defined as char s[MAX_LEN] where MAX_LEN is the maximum size of s. Here, [] is the scanset character. ^\n stands for taking input until a newline isn’t encountered. Then, with this %*c, it reads the newline character and here, the used * indicates that this newline character is discarded.

Note: The statement: scanf("%[^\n]%*c", s); will not work because the last statement will read a newline character, \n, from the previous line. This can be handled in a variety of ways. One way is to use scanf("\n"); before the last statement.

Task

You have to print the character, ch, in the first line. Then print s in next line. In the last line print the sentence, sen.

Input Format

First, take a character, ch as input.
Then take the string, s as input.
Lastly, take the sentence sen as input.

Constraints

Strings for s and sen will have fewer than 100 characters, including the newline.

Output Format

Print three lines of output. The first line prints the character, ch.
The second line prints the string, s.
The third line prints the sentence, sen.

HackerRank Playing with characters Solution in C.

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() 
{
    char ch,s[100],sen[122];
    scanf("%c\n%s\n%[^\n]",&ch,&s,&sen);
    printf("%c\n%s\n%s",ch,s,sen);
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    return 0;
}

Explanation

In the above solution first, we included the necessary header files. after that we defined main() function. in the main function first we defined a character variable ch, an array of characters of length 100, and then again an array of characters with a length of 122.

After that, we use the scanf() function to read all the variable values using the %C for character variable and %s for string and sentence variable. after that, we used the printf() function to print all the values. for the new line, we have used the \n (newline character) to go to the new line.

Second solution

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() 
{
    char ch,s[100],sen[122];
    scanf("%c", &ch);
    scanf("%s", &s);
    scanf(" %[^\n]%*c", &sen);
    printf("%c\n%s\n%s",ch,s,sen);
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    return 0;
}

Explanation

This second solution is the same as the first solution. the difference is that we have used the three different scanf() functions to scan the values.