C Programming Code Examples
C > Functions Code Examples
C program to find sum of natural numbers in given range using recursion
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
/* C program to find sum of natural numbers in given range using recursion
Write a recursive function in C programming to find sum of all natural numbers between 1 to n. How to find sum of all natural numbers using recursion in C program.
First give a meaningful name to the function, say sumOfNaturalNumbers().
Next the function must accept two inputs i.e. the lower and upper limit to find sum. Hence, pass two integer parameters to the function say sumOfNaturalNumbers(int start, int end).
Finally, the function must return sum of natural numbers between start and end. Therefore return type of function should be int.
The final function declaration to find sum of all natural numbers in given range is - int sumOfNaturalNumbers(int start, int end); */
#include <stdio.h>
/* Function declaration */
int sumOfNaturalNumbers(int start, int end);
int main()
{
int start, end, sum;
/* Input lower and upper limit from user */
printf("Enter lower limit: ");
scanf("%d", &start);
printf("Enter upper limit: ");
scanf("%d", &end);
sum = sumOfNaturalNumbers(start, end);
printf("Sum of natural numbers from %d to %d = %d", start, end, sum);
return 0;
}
/* Recursively find the sum of natural number */
int sumOfNaturalNumbers(int start, int end)
{
if(start == end)
return start;
else
return start + sumOfNaturalNumbers(start + 1, end);
}
A function is a group of statements that together perform a task. Every C program has at least one function, which is main(), and all the most trivial programs can define additional functions. You can divide up your code into separate functions. How you divide up your code among different functions is up to you, but logically the division is such that each function performs a specific task. A function declaration tells the compiler about a function's name, return type, and parameters. A function definition provides the actual body of the function. The C standard library provides numerous built-in functions that your program can call. For example, strcat() to concatenate two strings, memcpy() to copy one memory location to another location, and many more functions. A function can also be referred as a method or a sub-routine or a procedure, etc.
#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:
The if-else statement is used to perform two operations for a single condition. The if-else statement is an extension to the if statement using which, we can perform two different operations, i.e., one is for the correctness of that condition, and the other is for the incorrectness of the condition. Here, we must notice that if and else block cannot be executed simiulteneously. Using if-else statement is always preferable since it always invokes an otherwise case with every if condition.
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,
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.
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.
How to find the 'first occurrence' of any word in a string in C. Input string from user, store it in a variable "str". Input word 'to be searched' from user, store it in some other variable say
This program takes string and its substring as input, removes the Substring from the string. Take a string, its substring as input and Store it in the array str[] & key[] respectively. Store
Program 'takes a number' as input and finds a Greater number of the entered number using same digits. Take a number as input. Reverse the number and store it in the array. Using for
This C Program code finds the intersection & union of 2 Linked lists. Intersection is a set of elements that are common in both lists while union is a set of all Unique Elements in both...
C code accept records of the different states using array of structures. A structure should contain Char state, population, literacy rate, & income. Display the State whose Literacy
C program code shall help you learn one of basics of arrays. Copying an array involves index-by-index copying. For this to work we shall know the length of array in advance,...
