How to resolve the algorithm Split a character string based on change of character step by step in the C programming language
Published on 7 June 2024 03:52 AM
How to resolve the algorithm Split a character string based on change of character step by step in the C programming language
Table of Contents
Problem Statement
Split a (character) string into comma (plus a blank) delimited strings based on a change of character (left to right). Show the output here (use the 1st example below).
Blanks should be treated as any other character (except they are problematic to display clearly). The same applies to commas.
For instance, the string: should be split and show:
Let's start with the solution:
Step by Step solution about How to resolve the algorithm Split a character string based on change of character step by step in the C programming language
The provided C code takes a string, 'input', as input and splits it into a new string, 'result', where each character is separated by ", ". The function 'split' performs this operation. Here's a detailed explanation of the code:
-
Header Files:
- The code includes the necessary header files for input/output operations (
<stdio.h>
), memory allocation (<stdlib.h>
), and string manipulation (<string.h>
).
- The code includes the necessary header files for input/output operations (
-
'split' Function:
- The
split
function takes a single character pointer,str
, as input and returns a newly allocated string containing the split version of the input string. - It initializes several variables:
last
: Stores the last encountered character in the input string.result
: A pointer to the allocated memory for the split string.counter
: A pointer that iterates through theresult
string.
- It loops through the characters of the input string
str
:- If the current character is different from the
last
character, it inserts a ", " separator into theresult
string usingstrcpy
. - It updates
last
to the current character. - It copies the current character to the
result
string.
- If the current character is different from the
- After processing all characters, it terminates the
result
string with a null character ('\0'
) and usesrealloc
to adjust the size of the allocated memory to fit the actual length of the result string. Finally, it returns theresult
pointer.
- The
-
'main' Function:
- The
main
function defines the entry point of the program:- It declares a character array
input
of size 13 and initializes it with the given string "gHHH5YY++///". - It calls the
split
function on theinput
string and prints the returned split string.
- It declares a character array
- The
-
Program Flow:
- The program executes the
main
function. - The
main
function calls thesplit
function, passing theinput
string. - The
split
function processes theinput
string, inserts ", " separators for consecutive similar characters, and returns the split string. - The
main
function prints the split string, which is the original string with ", " separators.
- The program executes the
Source code in the c programming language
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char *split(char *str);
int main(int argc,char **argv)
{
char input[13]="gHHH5YY++///\\";
printf("%s\n",split(input));
}
char *split(char *str)
{
char last=*str,*result=malloc(3*strlen(str)),*counter=result;
for (char *c=str;*c;c++) {
if (*c!=last) {
strcpy(counter,", ");
counter+=2;
last=*c;
}
*counter=*c;
counter++;
}
*(counter--)='\0';
return realloc(result,strlen(result));
}
You may also check:How to resolve the algorithm Walk a directory/Non-recursively step by step in the Common Lisp programming language
You may also check:How to resolve the algorithm Steffensen's method step by step in the FreeBASIC programming language
You may also check:How to resolve the algorithm Hello world/Text step by step in the Clay programming language
You may also check:How to resolve the algorithm Logical operations step by step in the M4 programming language
You may also check:How to resolve the algorithm Twin primes step by step in the Kotlin programming language