C Decision Making: If, If-Else, Switch-Case Statements – MPS

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In this C programming class, we will cowl the C resolution-making constructs so as C if, if-else, and the switch-case assertion. It is additionally identified as conditional programming in C.

C Decision Making Statements

In your life, you experience conditions the spot you need to choose be it your number one suppers dish or the shade of your new car. In C programming also, odds are you’ll experience such conditions the spot it’s fundamental to decide.

The circumstances in the C language will help you.

C principally gives the following three types of restrictive or goal-making assemble.

  1. if statement
  2. if-else statement
  3. switch case

if Statement in C Programs

The if statement facilitates testing a selected situation. If that situation is true, then a selected block (enclosed under the if) of code will get executed.

This flowchart will aid you.

if statement in C Programs
if statement

Now we’ll see an easy program utilizing if statement.

Example 1: Program to find out the higher quantity between two numbers.

Flowchart:

C Decision Making - If Example
C Decision Making – If Example

Algorithm:

Step 1: Start.
Step 2: Take two inputs (a and b) from the person.
Step 3: If a is higher than b then go to step 4 in any other case go to step 5
Step 4: Print a higher than b
Step 5: Print b higher than a
Step 6: Stop.

Code:

#include<stdio.h>
void main()
{
    int a,b;
    printf("Enter two numbers :");
    scanf("%d %d",&a,&b);

    if (a>b)
   {
        printf("%d is greater",a);
  }
    printf("%d is greater",b);

    retutn(0);
}

Output:

Program to find out the higher quantity between two numbers.

2. if-else Statement in C

The if attestation functions admirably, in any case, if you need to work with additional variables and additional information, the if-else explanation comes into play.

ue,

In the if proclamation, only one square of code executes after the circumstance is true.

But in the if-else explanation, there are two squares of code – one for managing the achievement and different for the disappointment situation.

This flowchart will aid you to get it.

C Decision Making - If...Else Statement
C Decision Making – If…Else Statement

Syntax:

if(situation)

    //Statement block

else

    //Statement block

Example 2: Program to find out whether or not a quantity is odd or even.

Flowchart:

C Decision Making - If Else Example
C Decision Making – If Else Example

Algorithm:

Step 1: Start.

Step 2: Take enter from the person.

Step 3: Check condition. If the rest is zero then go to step 4 else go to step 5

Step 4: Print a is even and go to step 6

Step 5: Print a is odd

Step 6: Stop

Code:

#include<stdio.h>

void main()
{
    int a;

    printf("Enter a numbers:");
    scanf("%d",&a);

    if (a%2 == 0)
    {
        printf("%d is even", a);
    }
    else
   {
        printf("%d is odd", a);
     }
    return(0);
}

Output:

You can use a number of if-else statements which are known as “nested if-else” statements. It is no totally different than the one above you should use varied if-else statements in this order. Just preserve in thoughts that the sequence ought to finish with a final else assertion, not if statement.

3. Switch-Case Statement in C

When you need to execute a number of statements under one operation, for there Switch-case comes into play.

There are a number of instances beneath one switch statement.

Syntax:

switch(variable)

    case n1:
        //1Statement block;
        break;
    case n2:
        //2Statement block;
        break;
    .
    .
    .
    case n:
        //Statement block;
        break;

Here the variable is taken from the person as enter.

Example 3: Program to calculate the area of a rectangle, circle, or triangle by taking the person’s selection.

Flowchart:

C Decision Making - Switch...Case Example
C Decision Making – Switch…Case Example

Algorithm:

Step 1: Start

Step 2: Initialize variables

Step 3: Take enter for selection and then for space variables from the person

Step 4: Case 1: Circle: 3.14 *3.14*r

Case 2: Rectangle: ar =a * b

Case 3: Triangle: at =0.5* a *b

Step 5: Display output in accordance with case

Step 6: Stop

Source Code:

#include<stdio.h>

void main()
{
    int ac, ar, at, r, a, b, selection;

    printf("Enter your choice”);
    prinft("A for area of circle \n”);
    printf("B for area of rectang \n”);
    printf("C for space of triang 'n");
    scanf("%c",&selection);

    switch(selection)
    {
    case A:
        printf("Enter radius: ");
        scanf("%d",&r);
        ac=3.14*3.14*r;
        printf("Area of circle is: %d",ac);
        break;
    case B:
        printf("Enter the length and breadth:");
        scanf("%d%d",&a,&b);
        ar=a*b;
        printf("Area of the rectangle is: %d", ar);
        break;
    case C:
        printf("Enter value of base and height: ");
        scanf("%d%d",&a,&b);
        at=0.5*a*b;
        printf("Area of triangle is: %d", at);
        break;
    }
return(0);
}

Output:

C Decision Making - Switch...Case Output

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Pramod Kumar Yadav is from Janakpur Dham, Nepal. He was born on December 23, 1994, and has one elder brother and two elder sisters. He completed his education at various schools and colleges in Nepal and completed a degree in Computer Science Engineering from MITS in Andhra Pradesh, India. Pramod has worked as the owner of RC Educational Foundation Pvt Ltd, a teacher, and an Educational Consultant, and is currently working as an Engineer and Digital Marketer.

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