C program to find greatest of three numbers

In this post, you will learn how to find the greatest of three numbers using the C programming language.

Such a type of logical programming can be asked in a programming interview. It helps to improve the thinking power of a new developer. There are different ways to find the largest of the three numbers in C. Here, we have mentioned most of them.

Find the greatest of 3 numbers using If Statement

Here, we have only used the if statement to find the greatest of three numbers in C. This program prompts the user to enter three number inputs. The program compares all three numbers and returns the greatest number in the output.

#include <stdio.h>
int main() {
    int n1, n2, n3;
    // Getting three integer values from user
    printf("Enter three different numbers: ");
    scanf("%d %d %d", &n1, &n2, &n3);

    if (n1 >= n2 && n1 >= n3)
        printf("%d is the largest number.", n1);

    if (n2 >= n1 && n2 >= n3)
        printf("%d is the largest number.", n2);

    if (n3 >= n1 && n3 >= n2)
        printf("%d is the largest number.", n3);

    return 0;
}

Enter three different numbers: 45
93
15
93 is the largest number.

Enter three different numbers: 62
52
15
62 is the largest number.

Find the greatest of 3 numbers using If Else Statement

Here, we have asked the user to enter three numbers and used the if and else if statements to find the greatest number in C.

#include <stdio.h>
int main() {
    int n1, n2, n3;

    // Getting three integer values from user
    printf("Enter three different numbers: ");
    scanf("%d %d %d", &n1, &n2, &n3);

    if (n1 >= n2 && n1 >= n3)
        printf("%d is the largest number.", n1);

    else if (n2 >= n1 && n2 >= n3)
        printf("%d is the largest number.", n2);

    else
        printf("%d is the largest number.", n3);

    return 0;
}

Enter three different numbers: 733
124
642
733 is the largest number.

Find the greatest of 3 numbers using nested if-else statements

Here, we have asked the user to enter three numbers and used the nested if-else statements to find the greatest number in C.

#include <stdio.h>
int main() {
    int n1, n2, n3;

    // Getting three integer values from user
    printf("Enter three different numbers: ");
    scanf("%d %d %d", &n1, &n2, &n3);

    if (n1 >= n2) {
        if (n1 >= n3)
            printf("%d is the largest number.", n1);
        else
            printf("%d is the largest number.", n3);
    }
    else {
        if (n2 >= n3)
            printf("%d is the largest number.", n2);
        else
            printf("%d is the largest number.", n3);
    }

    return 0;
}

Enter three different numbers: 123
532
241
532 is the largest number.

Find the greatest of 3 numbers using ternary operator

Here, we have used the ternary operator to find the greatest number in C.

#include <stdio.h>
int main()
{
    int n1, n2, n3, largest;
  
    printf("Enter three numbers: ");
    scanf("%d %d %d", &n1, &n2, &n3);
  
    largest = n1 > n2 ? (n1 > n3 ? n1 : n3) : (n2 > n3 ? n2 : n3);
  
    printf("%d is the largest number.", largest);
  
    return 0;
}

Enter three numbers: 67 34 90
90 is the largest number.

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