C, Firmware or System Software Programming Motivation

  C is just a step up from assembly language, which is practically a hexadecimal human translation of machine code and considered the lowest level programming language. Hence programming, debugging and maintaining C code when applied to embedded software/firmware applications can be a nightmare if not practiced properly. Following industry standard programming exercises, solutions will give you the real development experience for your competitive exams, interviews.

  To whom this webpage is useful?

• You are college fresher and looking for C programming skills for job interviews/written tests.
• You are pursuing an academic course and having a c programming assignment.
• You are an experienced professional looking to freshen up your C programming skills.
• You are a hobbyist trying to learn all emerging C programming real embedded applications.

 Exercises and solutions: Functions,Variables,Datatypes,Loops

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Difficulty Level	Question
Low	Write a c program function to calculate the sum of two integers where the two integers will be provided by the user.
Low	Write a c program function to compute (a+b)^2 where the value of a and b will be provided by the user.
High	Write C function to calculate the factorial of a number and illustrate the use of recursion.
Medium	Write a c program function to accept the principal, rate of interest, period of deposit and to calculate the simple interest.
Medium	Write a program for illustrating the use of inline function in c programming.
Low	Write a c program function to accept 2 integers and return the result after adding them and then dividing the result by 2.
Low	Write a c program function to calculate the circumference of a circle if the radius of the circle is passed to it.
Medium	Write a c program function to calculate the area of a circle if the radius of the circle is passed to it.
Medium	Write a c program function to accept the temperature in Deg Centigrade and convert it to Fahrenheit.

High	Write a C Program macro to check if a character is alphabetic or not.
High	Write a c program function to calculate the sum of all digits of an integer number.
Medium	Write a C program to check whether year is leap year or not using conditional/ternary operator.
Low	Write a c program function to accept an integer number and return lsb first digit of the number.
Medium	Write a program to demonstrate the use of auto/local and global variables in C programming
Medium	Write a program with two files ext1.c and ext2.c to demonstrate the use of extern keyword
Low	Write a C program to return the bigger number between 2 integers using conditional/ternary operator.
Medium	Write a program to demonstrate the use of static keyword in C programming.
High	Write a C program function to convert Decimal to Binary number system.
Medium	Write a c program function to accept an integer number and return msb last digit of the number.

High	Write a C program to create a triangle of letter A.
Medium	Write a c program function to calculate the sum of even integers from 2 to 100.
Medium	Write a C program function to print a half pyramid using *
High	Write a c program function to create simple calculator using switch case.
Medium	Write a c program function to calculate the sum of odd integers from 1 to 100.
Medium	Write a c program function to find the maximum of three given integers.
High	Write a c program function to check a given number is even parity(even no of 1s) or odd parity(odd no of 1s).

 Exercises and solutions: Arrays,Strings,Pointers

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Difficulty Level	Question
Medium	Write a c function to print asterisks on screen corresponding to each integer in an integer array.
Medium	Write a c program to add two 2-dimensional arrays or 2-D arrays.
Medium	Write a C program function to take an integer array in array format and return the sum of all elements in the array.
High	Write a program to accept a two dimensional integer array and return the sum of all elements in the array.
Low	Write a C program function to take a character array in array format and return the last character of the array passed to it.
Medium	Write a c program to calculate the first 20 Fibonacci numbers.
High	Write a C program to find longest sequence of elements in an array.

Medium	Write a C program to count the number of characters in a string without using the c inbuilt library.
High	Write a C program function to reverse the string passed to it without using the c inbuilt library.
Medium	Write a c program function to accept a string and return the character written two times continuously in the string.
Low	Write a c program to accept a string as input and return the last character of the string as output of the function.
Medium	Write a C program function to take a string as its input and return the first word of the string passed to it.
High	Write a c program function that reverses the string passed to it without declaring any new string within the function.
High	Write a C program function to count frequency of each character in a string and return the maximum frequency.
High	Write a program to find the number of times that a given word(i.e. a short string) occurs in a sentence (i.e. a long string!).
Low	Write a c program function to calculate the number of words present in a string passed to it.

Medium	Write a c program to accept a string as input and return the number of words present in it using pointers.
Medium	Write a c program function to swap two integers using pointers.
High	Write a c program function to reverse the string passed to it using pointers and without using the c inbuilt library.
High	Write a C program function to return the 5th element of an array using pointer to a function.
High	Write a c program function to swap two integers using function pointers.
High	Write a c program function to return the same string after reversing it using pointers
High	Write a function to loop through the strings present in an array of pointers to string
High	Write a c program function to take your name as input using fgets stdin and print the name as output

 Exercises and solutions: Structures,unions,enums,bit fields

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Difficulty Level	Question
High	Write a C program function to enter different book information(pages, author, search id) in a school library and search any book using search id and structure arrays.
Medium	Write a C program function to enter different book information(pages, author, search id) in a school library.
High	Write a C program function to enter different book information(pages, author, search id) in a school library and display the existing books using structure pointers.
High	Write a C program function to enter different book information(pages, author, search id) in a school library and display the existing books using structure arrays.
High	Write a C program function to enter different book information(pages, author, search id) in a school library and search any book using search id and structure pointers.
Medium	Write a function to determine whether the machine is Little Endian or Big Endian.
High	Write a program to swap the 4bytes of an integer. If input is provided as 0x12345678 output is generated as 0x78563412.

Medium	Write a c program to find the current day of the week using enum.
Medium	Write a c program function to set bit 1 for a given number.
Medium	Write a c program to toggle the second bit of an integer from LSB.
High	Write a C program function to swap the nibbles in a byte.
High	Write a C program to get the status of nth bit of a number.
High	Write a C program to set the 0th to 3rd bits of an integer.
Medium	Write a c program to clear the second bit of an integer from LSB.

 Exercises and solutions: File handling, Data structures, Linked lists

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Difficulty Level	Question
Medium	Write a C program to store data in an internal buffer using sprintf in-built function.
High	Write a program to read data line by line from a file using fscanf in-built function.

High	Write a c program function to add new nodes in the middle of a singly linked list.
High	Write a c program function to add new nodes at the end of a singly linked list.
High	Write a c program function to display all node data present in a singly linked list.
High	Write a c singly linked list program to add a node at the beginning of the list.