C Programming Code Examples
C > Conversions Code Examples
C Program to Convert Octal Number to Decimal Number
/* C Program to Convert Octal Number to Decimal Number
The program takes the octal number (entered by user) as input and converts it into a decimal number using function. */
#include <stdio.h>
#include <math.h>
/* This function converts the octal number "octalnumber" to the
* decimal number and returns it.
*/
long octalToDecimal(int octalnumber)
{
int decimalnumber = 0, temp = 0;
while(octalnumber != 0)
{
decimalnumber = decimalnumber + (octalnumber%10) * pow(8,temp);
temp++;
octalnumber = octalnumber / 10;
}
return decimalnumber;
}
int main()
{
int octalnumber;
printf("Enter an octal number: ");
scanf("%d", &octalnumber);
printf("Equivalent decimal number is: %ld", octalToDecimal(octalnumber));
return 0;
}
#include is a way of including a standard or user-defined file in the program and is mostly written at the beginning of any C/C++ program. This directive is read by the preprocessor and orders it to insert the content of a user-defined or system header file into the following program. These files are mainly imported from an outside source into the current program. The process of importing such files that might be system-defined or user-defined is known as File Inclusion. This type of preprocessor directive tells the compiler to include a file in the source code program. Here are the two types of file that can be included using #include:
In C, the "main" function is treated the same as every function, it has a return type (and in some cases accepts inputs via parameters). The only difference is that the main function is "called" by the operating system when the user runs the program. Thus the main function is always the first code executed when a program starts. main() function is a user defined, body of the function is defined by the programmer or we can say main() is programmer/user implemented function, whose prototype is predefined in the compiler. Hence we can say that main() in c programming is user defined as well as predefined because it's prototype is predefined. main() is a system (compiler) declared function whose defined by the user, which is invoked automatically by the operating system when program is being executed.
Writes the C string pointed by format to the standard output (stdout). If format includes format specifiers (subsequences beginning with %), the additional arguments following format are formatted and inserted in the resulting string replacing their respective specifiers. printf format string refers to a control parameter used by a class of functions in the input/output libraries of C programming language. The string is written in a simple template language: characters are usually copied literally into the function's output, but format specifiers, which start with a % character, indicate the location and method to translate a piece of data (such as a number) to characters. "printf" is the name of one of the main C output functions, and stands for "print formatted". printf format strings are complementary to scanf format strings, which provide formatted input (parsing). In both cases these provide simple functionality and fixed format compared to more sophisticated and flexible template engines or parsers,
Read formatted data from stdin. Reads data from stdin and stores them according to the parameter format into the locations pointed by the additional arguments. The additional arguments should point to already allocated objects of the type specified by their corresponding format specifier within the format string. In C programming, scanf() is one of the commonly used function to take input from the user. The scanf() function reads formatted input from the standard input such as keyboards. The scanf() function enables the programmer to accept formatted inputs to the application or production code. Moreover, by using this function, the users can provide dynamic input values to the application.
While loop is also known as a pre-tested loop. In general, a while loop allows a part of the code to be executed multiple times depending upon a given boolean condition. It can be viewed as a repeating if statement. The while loop is mostly used in the case where the number of iterations is not known in advance. The while loop evaluates the test expression inside the parentheses (). If test expression is true, statements inside the body of while loop are executed. Then, test expression is evaluated again. The process goes on until test expression is evaluated to false. If test expression is false, the loop terminates.
Raise to power. Returns base raised to the power exponent: baseexponent. The function pow() is used to calculate the power raised to the base value. It takes two arguments. It returns the power raised to the base value. It is declared in "math.h" header file.
Program example catches the Ctrl-C (SIGINT) signal for the first time and prints a output rather but exits on pressing ctrl-c again. You have presses Ctrl-C, please press again to exit
The 'smallest element' is exchanged with the first element of the unsorted list of elements. The "second smallest element" is Exchanged with the 'second element' of the unsorted list
Write a Recursive Function in C Language to calculate sum of digits of a number. Declare Recursive Function to find sum of digits of a number. First give a meaningful name to the
Arithmetic operator performs mathematical operations such as addition, subtraction and multiplication on numerical values (constants and variables). C Program to demonstrate...
Write a c programming example to print stuff to a file reading the number of time for an other file. Program code to read the number from a file. Program code to write to the file.
Concatenation of 2 strings is simple copying a string to another. To concatenate two Strings str1 & str2, you will copy all characters of str2 at the end of str1. 'Store it in' a variable str1 &
C Programming language example to display decimal equivalent of a input binary number. What will be the length of input no.? Don't exceed input from your input limit or 5 digits
Function for inserting an element into a list. Function for displaying the list. Function for reversing the list by recursion. Stores the address of the first element. Also stores the
C program input two numbers and perform all arithmetic operations. How to perform all arithmetic operation between two numbers in C programming. C program to find sum,...
