C Foundation

What is C? C Compiler Installation C Extensions C Compiler C Interpreter C Program Structure

C Basics

C Keywords C Data Types C Identifiers C Variables C Constant C Escape Sequences C Constant and Volatile C Typecast


What is Operator C Comma Operator C Arithmetic Operators C Relational Operators C Logical Operators C Bitwise Operators C Conditional Operators C : : Operator C Operator Priority

Basic IO's

Basic IO's C Formatted Functions C Unformatted Functions C Common Functions

Control Statements

What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement


What is Control Loop C for Loop C Nested for Loop C while Loop C Nested while Loop C do while Loop C Nested do while loop


What is Function C User Defined Functions C Recursion C Passing Parameters


Scope C Local Scope C Global Scope

Storage Classes

What is Storage Class C Auto C Extern C Static C Register


What is Array C One Dimensional Array C Two Dimensional Array C Multi Dimensional Array C Arrays Of Strings


What is String C String Functions


What is Pointer C Pointers Arithmetic C Pointer to Pointer C Pointers and Arrays C Pointers and Strings C Pointer to Functions Void Pointers Null Pointers C Null and Void Pointer


What is Structure C Struct within Struct C Array within Structure C Pointer to Structure C Structure and Function C Enum C Bitfield Structure C Type def


What is Union


What is File C read a file C write a file C File Handling C Error Handling C Low Level Disk I/O C Other file functions

Memory Allocation

What is Memory Allocation C Malloc() C Calloc() C Free() C Realloc() C Coreleft()

C Reference

All ASCII Code Basic C Questions

C Interview

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The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

C Sort String Characters

Here your task is to sort all characters of your entered string in alphabetical order. For example, if user entered a string "orange", you should reply back with a string "aegnor"

Program To Sort Given String

Let us write our own c program to sort the character of a string in alphabetical order

#include <stdio.h>
#include <ctype.h>
#include <string.h>
int main()
int i, j, len, k = 0, len1;
char text[30], store[30];
printf("Enter a String : ");
len = strlen(text);
printf("Sorted Characters alphabetically : ");
for(i = 65;i <= 90;i++)
for(j = 0;j < len;j++)
if(text[j] == toupper(i) || text[j] == tolower(i))
store[k] = text[j];
len1 = strlen(store);
for(i = 0;i <= len1;i++)
printf("%c", store[i]);
return 0;
Enter a String : apple
Sorted Characters alphabetically : aelpp


In the following program we use gets() function to get string from our user and then we make use of ASCII code to sort the characters of a string alphabetically i.e) in ascending order from 97 to 122, which gets stored in store[] array. Finally the characters in store[] are displayed sequentially.

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