Decision making statement(If and Switch statement):

Program: Add two numbers, values enter at run time: 

#include<stdio.h> 

#include<conio.h> 

/*main program began structure here*/
void main() 

{ 

int n1, n2, sum; 

clrscr(); 

printf("Enter the two numbers "); 

scanf("%d %d", &n1, &n2); 

sum=n1+n2; 

printf("Addition of %d and %d is %d\n", n1,n2,sum); 

getch(); 

} 

Output:
Enter the two number qualities to be included 10 

10
Expansion of 10 and 10 is 20.
Clarification:
Coming up next is the bit by bit program portrayal: 

1. The lines between the/*.................*/are remarks which are composed for the software engineer they are not assembled. 

2. C program begins with #include<stdio.h>: this line incorporates the "Standard I/O Library" into the program. The standard I/O library lets to peruse contribution from the console called "standard in", compose yield to the screen called "standard out", process content documents put away on the circle, etc. It is an incredibly valuable library. C has an enormous number of standard libraries like conio, string, time and math libraries.

3. The line void primary() pronounces the principle work. Each C program must have a capacity named primary some place in the code. At run time, program execution begins at the primary line of the principle work.

4. In C, the '{' and '}' images mark the start and end of a square of code.

5. The variable instatement is done in the configuration information type var_name like int n1 where int is information type and n1 is variable name.

6. 'scanf()' takes the contribution from the end client.

7. The printf() explanation in C permits to send output on the brief. 

C has different types of statements that license the execution of a solitary articulation, or a square of explanations, in light of the assessment of a test articulation or grant the choice of the announcement to be executed among a few explanations dependent on the estimation of an articulation or a control variable.

Contingent stretching and determination articulations incorporate develops like: 

1. If Statement
2. Switch 

1. If Statement:
The general sentence structure of then if proclamation is given underneath.
Sentence structure:
on the off chance that (articulation)
{
Expression;
} 

Program : To check the number as even or odd utilizing if-else proclamation. 

#include<stdio.h> 

void main()
{
int n;
clrscr();
printf("Enter any number");
scanf("%d"' &n);
if(n%2==0)
printf("%d number is even number",n);
else
printf("%d is an odd number",n);
getch();
}
Output:
Enter any number 10
10 number is much number 

2. Switch Statement:

C has a built-in multiple-branch selection statement, called switch, which progressively tests the estimation of an articulation against a rundown of number or character constants. At the point when a match is discovered, the announcements related with that consistent are executed until break or end of switch is experienced. 

Break proclamation interferes with the typical progression of control and afterward moves as far as possible of the code or continues to the ordinary execution. This is another type of the multi-way choice. 

The default explanation is executed if no matches are found. The default is discretionary, and on the off chance that it not present, no activity happens if all matches come up short. 

Syntax:
switch(expression) 

{
case constant1: 

statement sequence

break; 

case constant2: 

statement sequence

break; 

case constant3: 

statement sequence

break; 

. 

. 

. 

. 

default 

statement sequence

}

Some other links:

What is C language(elements, features, data types):

Decision making statement:

Statements-Return,exit, break, continue:

Array in C programming:

Constants and keywords in C language:

Declaration Initialization of one dimensional array:

One dimensional array(traversal and searching):

One dimensional array( Insertion and deletion):

Sorting arrays-Insertion sort:

Sorting arrays-Bubble and quick sort:

C programs(Addition of two number):

Switch case statement in C:

Loops in C (for, while, do-while):

C Programming(prime or not, Fibonacci series):

C programs(Factorial, even, triangle,pyramid):

C Programs using string and matrix:

C Programs using while loop and array: