Decision Making Statements in C Programming

Introduction:-

Decision making statements allow a program to take decisions based on conditions.  

They help control the flow of execution in a program.

______________________________

*In C programming, decision making is done using:

- if statement

- if-else statement

- else-if ladder

- switch statement


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1. if Statement

The if statement executes a block of code only when the condition is true.


Syntax:

if(condition) {

    // code to execute

}


Example:

#include <stdio.h>

int main() {

    int age = 18;

  if(age >= 18) {

        printf("You can vote");

    }

   return 0;

}


--------------------------------------------------


2. if-else Statement

The if-else statement executes one block if condition is true, otherwise another block.


Syntax:

if(condition) {

    // true block

}

else {

    // false block

}


Example:

#include <stdio.h>

int main() {

    int num = 10;

  if(num % 2 == 0)

        printf("Even Number");

    else

        printf("Odd Number");

  return 0;

}


--------------------------------------------------


3. else-if Ladder

Used to check multiple conditions.

Syntax:

if(condition1) {

}

else if(condition2) {

}

else {

}


Example:

#include <stdio.h>

int main() {

    int marks = 85;

   if(marks >= 90)

        printf("Grade A");

    else if(marks >= 70)

        printf("Grade B");

    else

        printf("Grade C");

 return 0;

}


--------------------------------------------------


4. switch Statement

Used to select one option from many choices.


Syntax:

switch(variable) {

    case value1:

        // code

        break;

    case value2:

        // code

        break;

    default:

        // code

}


Example:

#include <stdio.h>

int main() {

    int day = 1;

  switch(day) {

        case 1:

            printf("Monday");

            break;

        case 2:

            printf("Tuesday");

            break;

        default:

            printf("Invalid Day");

    }

   return 0;

}


--------------------------------------------------


Why Decision Making is Important

- Controls program flow

- Helps build logic

- Used in real-world applications

- Makes programs intelligent


--------------------------------------------------


Conclusion

Decision making statements help programs choose actions based on conditions.  

After understanding this topic, you can learn loops in C programming.


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