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C++ Program to Find Smallest Number in Array



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In this article, you will learn and get code to find and print smallest element (number) from an array in C++. The size and elements for array must be entered by user at run-time. Here are the list of approaches used to create the program:

Find Smallest Number in an Array

To find the smallest element or number in an array in C++ programming, you have to ask from user to enter the size and elements for array. Now find and print the smallest one as shown in the program given below:

The question is, write a program in C++ to find and print smallest number in an array. Here is its answer:

#include<iostream>
using namespace std;
int main()
{
    int arr[100], tot, i, s;
    cout<<"Enter the Size for Array: ";
    cin>>tot;
    cout<<"Enter "<<tot<<" Array Elements: ";
    for(i=0; i<tot; i++)
        cin>>arr[i];
    s = arr[0];
    for(i=1; i<tot; i++)
    {
        if(s>arr[i])
            s = arr[i];
    }
    cout<<"\nSmallest Number = "<<s;
    cout<<endl;
    return 0;
}

This program was build and run under Code::Blocks IDE. Here is its sample run:

C++ program find smallest element in array

Now supply any number say 5 as array size, and then enter 5 numbers as 5 array elements. After supplying all these things, press ENTER key to find and print the smallest number from the array as shown in the snapshot given below:

find smallest number in array c++

The following statement:

s = arr[0];

supposed that the number at 0th (very first) index is the smallest number. And then we've compared all the number at remaining indexes one by one with the number at s. If s's value is found greater than any number at any index, then we've initialized that number as new value of s.

The dry run of above program goes like:

Find Smallest Number in Array using Pointer

Now let's create the same purpose program using pointer. The & is called as address of operator. Whereas * is called as value at operator.

#include<iostream>
using namespace std;
int main()
{
    int arr[100], tot, i, s, *ptr;
    cout<<"Enter the Size for Array: ";
    cin>>tot;
    cout<<"Enter "<<tot<<" Array Elements: ";
    for(i=0; i<tot; i++)
        cin>>arr[i];
    ptr = &arr[0];
    s = *ptr;
    while(*ptr)
    {
        if(s>(*ptr))
            s = *ptr;
        ptr++;
    }
    cout<<"\nSmallest Number = "<<s;
    cout<<endl;
    return 0;
}

This program produces the same output as of previous program. After executing the following statement:

ptr = &arr[0];

The address of number present at 0th index in arr[] gets initialized to ptr. The *ptr indicates to the value present at address, that is stored in ptr. And the ptr++ is used to shift to the next index's address of the same array, arr[].

Find Smallest Number in Array using Function

This is the last program on finding the smallest element in an array. This program is created using a user-defined function named findSmallest(). This function takes an array and its size as its argument. And returns the smallest number from the array (passed as its first argument).

#include<iostream>
using namespace std;
int findSmallest(int [], int);
int main()
{
    int arr[100], tot, i, s;
    cout<<"Enter the Size for Array: ";
    cin>>tot;
    cout<<"Enter "<<tot<<" Array Elements: ";
    for(i=0; i<tot; i++)
        cin>>arr[i];
    s = findSmallest(arr, tot);
    cout<<"\nSmallest Number = "<<s;
    cout<<endl;
    return 0;
}
int findSmallest(int a[], int t)
{
    int s, i;
    s = a[0];
    for(i=1; i<t; i++)
    {
        if(s>a[i])
            s = a[i];
    }
    return s;
}

Here is its sample run with user input, 6 as array size and 10, 8, 2, 5, 7, 12 as 6 array elements:

smallest number in array using function c++

Same Program in Other Languages

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