C program:find smallest of three numbers using function

In this tutorial, we will discuss the concept of the C program:find smallest of three numbers using function

In this post, we will learn how to find the smallest number among three numbers using a user-defined function in the C programming language

In my previous post, I have explained the various approaches to find the smallest number of among three numbers in C language

However, in this program, we embed the logic of the “find the smallest of three number” program in the function.

Here, I have explained how to find the smallest number from the given three number and how to embed this logic in the function.

Program 1

Find the smallest of three numbers using Nested if statements

This program allows the user to enter three numbers and compare to select the smallest number using nested if statements

#include <stdio.h>
#include <stdlib.h>
int biggestNum(int, int,int);//function prototype
int main()
{
    int num1,num2,num3; //declare the variables
    printf("Enter the first number:  ");
    scanf("%d",&num1);//get input from user for num1
    printf("Enter the second number: ");
    scanf("%d",&num2);//get input from user for num2
    printf("Enter the third number: ");
    scanf("%d",&num3);//get input from user for num3

//function call
    biggestNum(num1,num2,num3);
    getch();
    return 0;
}

    int biggestNum(int num1,int num2,int num3){//function definition
    if(num1<num2){//compare num1 and num2
            if(num1<num3){//compare num1 and num3
         printf("\nSmallest number is: %d\n",num1);
            }
            else{
                printf("\nSmallest number is: %d\n",num3);
            }
    }
    else{
        if(num2<num3){//compare num2 and num1
            printf("\nSmallest number is: %d\n",num2);
        }
        else{
            printf("\nSmallest number is: %d\n",num3);
        }

    }
    }

When the above code is executed, it produces the following results

Enter the first number: 67
Enter the second number: 98
Enter the third number: 34

Smallest number is: 34

Program 2

Find the smallest of three numbers using if else if statements

This program allows the user to enter three numbers and compare to select the smallest number using if-else-if statements

#include <stdio.h>
#include <stdlib.h>

int biggestNum(int, int,int);//function prototype
int main()
{
    int num1,num2,num3; //declare the variables
    printf("Enter the first number:  ");
    scanf("%d",&num1);//get input from user for num1
    printf("Enter the second number: ");
     scanf("%d",&num2);//get input from user for num2
    printf("Enter the third number: ");
     scanf("%d",&num3);//get input from user for num3

//function call
    biggestNum(num1,num2,num3);
    getch();
    return 0;
}

    int biggestNum(int num1,int num2,int num3){//function definition
    if(num1<num2&&num1<num3){
         printf("\nSmallest number is:%d",num1);
            }
    else if(num2<num3){//compare num2 and num1
            printf("\nSmallest number is:%d",num2);
        }
        else{
            printf("\nSmallest number is:%d",num3);
        }

    }

When the above code is executed, it produces the following results

Enter the first number: 67
Enter the second number:23
Enter the third number: 57

Smallest number is:23

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