fbpx

C Program To Find Largest of Three Numbers | Exploring Best 3 Approaches

Introduction

In programming, we programmers sometimes need to do a simple thing, which is make a c Program to find largest of three numbers. This task isn’t just about practice; it’s really important for lots of stuff we do. Like sorting numbers or finding the best solution for a problem.

In this blog post, we gonna learn three easy ways to make a computer program that find the biggest number out of three. We’ll explain each step, so it’s simple and fun! The first way is like a game of ‘yes’ or ‘no’. The second way is like picking between two choices – one if something is right, and the other if it’s not. The third way is like the second, but with more choices to pick from. Once you understand these three methods, you’ll be able to create a computer program that can always spot the largest number from any three numbers you provide.

C Program to Find Largest of Three Numbers Using if Statement
C Program to Find Largest of Three Numbers Using if Statement

C Program to Find Largest of Three Numbers using if statement

In C programming, the ‘if’ command is like a simple guide. It’s the easiest way to steer what actions a program takes. This command helps the program to make decisions. Imagine it like a crossroad where the program needs to choose which way to go. The ‘if’ command helps it decide the right path based on what’s happening at that moment.

Example: C Program to Find the Largest of Three Numbers using ‘if’ Statement

Here’s a simple program that finds the largest of three numbers using a series of if statements:

#include <stdio.h>

int main() {
    int a, b, c, largest;

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

    largest = a;

    if(b > largest)
        largest = b;
    if(c > largest)
        largest = c;

    printf("Largest number is: %d\n", largest);

    return 0;
}

This program starts by saying ‘a’ is the biggest number. Then it checks if ‘b’ or ‘c’ is bigger than ‘a’. If ‘b’ or ‘c’ is bigger, then it changes the biggest number to that. This way is easy, but can get tricky if we have more numbers to check.

Running the C Program: Output Using ‘if’ Statement

Enter three numbers: 12 5 9
Largest number is: 12

In-depth Analysis: How the ‘if’ Statement Works in the Program

  1. Include Header File:The code begins by adding the standard library stdio.h, which helps us to input and output information.
  2. Main Function: The main() function is where the program starts its works.
  3. Variables Declaration: Inside the main() function, we say that there are four things we’ll be working with: a, b, c, and largest.
  4. User Input: The program politely asks the user to write down three numbers. It does this by showing a message using printf(). After that, it takes these numbers and places them into the ‘a’, ‘b’, and ‘c’ spots. It does this with something called scanf().
  5. Initialization:largest is initialized with the value of a. This is done assuming that a is the largest number initially.
  6. Comparison: The program checks if b is greater than largest. If it is, largest is updated to b. Similarly, it checks if c is greater than largest and updates largest if necessary.
  7. Output: Finally, the program prints the value of largest using printf().
  8. Return: The main part of the program gives back a return of 0, which mean everything went smooth without any issues.

Algorithm Breakdown: C Program to Find the Largest of Three Numbers using ‘if’ Statement

  1. Start
  2. Declare three variables with name a, b, c, largest
  3. Display “Enter three numbers:”
  4. Read values for a, b, and c
  5. Set largest = a
  6. If b > largest, set largest = b
  7. If c > largest, set largest = c
  8. Display “Largest number is: largest”
  9. End
C Program to Find Largest of Three Numbers using if…else statement
C Program to Find Largest of Three Numbers using if…else statement

C Program to Find Largest of Three Numbers using if…else statement

In C programming, the ‘if..else’ command is like a simple tool for making choices. It’s like being at a fork in the road and having a guide to help you decide which way to go. This command lets the program pick one of two options. Think of it as a quick coin toss where the program can choose heads or tails based on what’s happening around it. This way, the program has a clear and simple method to make decisions.

Example: C Program to Find the Largest of Three Numbers using ‘if…else’ Statement

Here’s how you can find the largest of three numbers using if..else:

#include <stdio.h>

int main() {
    int a, b, c, largest;

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

    if(a > b && a > c)
        largest = a;
    else if(b > a && b > c)
        largest = b;
    else
        largest = c;

    printf("Largest number is: %d\n", largest);

    return 0;
}

This program directly compares a, b, and c to each other to find the largest number. This approach is more efficient than the previous one as it requires fewer comparisons. However, it can still be improved for readability and maintainability.

Running the C Program: Output Using ‘if…else’ Statement

Enter three numbers: 12 18 20
Largest number is: 20

In-depth Analysis: How the ‘if…else’ Statement Works in the Program

  1. Include Header File: The code begins by adding the standard library stdio.h, which helps us to input and output information.
  2. Main Function: The main() function is where the program starts its works.
  3. Variables Declaration: Inside the main() function, we say that there are four things we’ll be working with: a, b, c, and largest.
  4. User Input: The program politely asks the user to write down three numbers. It does this by showing a message using printf(). After that, it takes these numbers and places them into the ‘a’, ‘b’, and ‘c’ spots. It does this with something called scanf().
  5. Comparison: The program checks the numbers a, b, and c to see which one is biggest.
    • If a is greater than both b and c, it sets largest to a.
    • Otherwise, if b is greater than both a and c, it sets largest to b.
    • If none of the above conditions are true, it sets largest to c.
  6. Output: Finally, the program prints the value of largest using printf().
  7. Return: The main part of the program gives back a return of 0, which mean everything went smooth without any issues.

Algorithm Breakdown: C Program to Find the Largest of Three Numbers using ‘if…else’ Statement

  1. Start
  2. Declare three variables with name a, b, c, largest
  3. Display “Enter three numbers:”
  4. Read values for a, b, and c
  5. If a is greater than both b and c, set largest = a
  6. Else if b is greater than both a and c, set largest = b
  7. Else, set largest = c
  8. Display “Largest number is: largest”
  9. End
C Program to Find Largest of Three Numbers Using Nested If Else Statement
C Program to Find Largest of Three Numbers Using Nested If Else Statement

C Program to Find Largest of Three Numbers using Nested if…else

Nested if..else statements allow for more complex decision-making. They can be used to handle multiple conditions and provide a clear structure for the program.

Example: C Program to Find the Largest of Three Numbers using ‘Nested if…else’ Statement

Here’s how you can find the largest of three numbers using nested if..else:

#include <stdio.h>

int main() {
    int a, b, c, largest;

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

    if(a > b) {
        if(a > c)
            largest = a;
        else
            largest = c;
    } else {
        if(b > c)
            largest = b;
        else
            largest = c;
    }

    printf("Largest number is: %d\n", largest);

    return 0;
}

The program utilizes nested if…else statements to systematically evaluate a, b, and c. This organizational structure promotes readability and maintainability, allowing for a clearer understanding of the conditions being evaluated. However, as the number of conditions increases, the complexity of the code can grow, potentially hindering its readability and manageability.

Running the C Program: Output Using ‘Nested if…else’ Statement

Enter three numbers: 12 28 20
Largest number is: 28

In-depth Analysis: How the ‘Nested if…else’ Statement Works in the Program

  1. Include Header File: The code begins by adding the standard library stdio.h, which helps us to input and output information.
  2. Main Function: The main() function is where the program starts its works.
  3. Variables Declaration: Inside the main() function, we say that there are four things we’ll be working with: a, b, c, and largest.
  4. User Input: The program politely asks the user to write down three numbers. It does this by showing a message using printf(). After that, it takes these numbers and places them into the ‘a’, ‘b’, and ‘c’ spots. It does this with something called scanf().
  5. Comparison: The program compares the values of a, b, and c in a nested manner to determine which one is the largest:
    • If a is greater than b, it further checks if a is greater than c. If true, largest is set to a.
    • If a is not greater than c, largest is set to c.
    • If b is greater than a, it further checks if b is greater than c. If true, largest is set to b.
    • If b is not greater than c, largest is set to c.
  6. Output: Finally, the program prints the value of largest using printf().
  7. Return: The main part of the program gives back a return of 0, which mean everything went smooth without any issues.

Algorithm Breakdown: C Program to Find the Largest of Three Numbers using ‘Nested if…else’ Statement

  1. Start
  2. Declare three variables with name a, b, c, largest
  3. Display “Enter three numbers:”
  4. Read values for a, b, and c
  5. If a is greater than b,
    • If a is greater than c, set largest = a
    • Else, set largest = c
  6. If b is greater than a,
    • If b is greater than c, set largest = b
    • Else, set largest = c
  7. Display “Largest number is: largest”
  8. End

Conclusion

In this blog post, we explored three different approaches to find the largest of three numbers in C. Each approach has its trade-offs and considerations. The if statement is simple but can become cumbersome. The if..else statement is more efficient but can still be improved. The nested if..else statement provides a clear structure but can become complex.

References

Still unsure about how to do in C Program To Find Largest of Three Numbers
? Ask your question on StackOverflow or get expert help on GitHub.