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C Program to Find the Largest Number Among Three Numbers

In this example, you will learn to find the largest number among the three numbers entered by the user.

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To understand this example, you should have the knowledge of the following C programming topics:



Example 1: Using if Statement

#include int main() { double n1, n2, n3; printf("Enter three different numbers: "); scanf("%lf %lf %lf", &n1, &n2, &n3); // if n1 is greater than both n2 and n3, n1 is the largest if (n1 >= n2 && n1 >= n3) printf("%.2f is the largest number.", n1); // if n2 is greater than both n1 and n3, n2 is the largest if (n2 >= n1 && n2 >= n3) printf("%.2f is the largest number.", n2); // if n3 is greater than both n1 and n2, n3 is the largest if (n3 >= n1 && n3 >= n2) printf("%.2f is the largest number.", n3); return 0; }

Example 2: Using if…else Ladder

#include int main() { double n1, n2, n3; printf("Enter three numbers: "); scanf("%lf %lf %lf", &n1, &n2, &n3); // if n1 is greater than both n2 and n3, n1 is the largest if (n1 >= n2 && n1 >= n3) printf("%.2lf is the largest number.", n1); // if n2 is greater than both n1 and n3, n2 is the largest else if (n2 >= n1 && n2 >= n3) printf("%.2lf is the largest number.", n2); // if both above conditions are false, n3 is the largest else printf("%.2lf is the largest number.", n3); return 0; }

Example 3: Using Nested if…else

#include int main() { double n1, n2, n3; printf("Enter three numbers: "); scanf("%lf %lf %lf", &n1, &n2, &n3); if (n1 >= n2) { if (n1 >= n3) printf("%.2lf is the largest number.", n1); else printf("%.2lf is the largest number.", n3); } else { if (n2 >= n3) printf("%.2lf is the largest number.", n2); else printf("%.2lf is the largest number.", n3); } return 0; }

The output of all these programs above will be the same.

Enter three numbers: -4.5
3.9
5.6
5.60 is the largest number.
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