- C++ Programming Examples
- C++ Programming Examples
- C++ Hello World
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- C++ Print Integer
- C++ Add Two Numbers
- C++ Add Sub Mul Div
- C++ Add Digits
- C++ Find Average Perc
- C++ Find Arithmetic Mean
- C++ Sum of n Natural Numbers
- C++ Sum of n Numbers
- C++ Area Perimeter of Square
- C++ Area Perimeter of Rectangle
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- C++ Area Circum of Circle
- C++ Find Simple Interest
- C++ Fahrenheit to Celsius
- C++ Celsius to Fahrenheit
- C++ Print Prime Numbers
- C++ Reverse a Number
- C++ Swap Two Numbers
- C++ Print Multiplication Table
- C++ Find Factorial of Number
- C++ Find Factors of Number
- C++ Find HCF & LCM
- C++ Make Calculator
- C++ Count Digits in Number
- C++ Sum of First & Last Digit
- C++ Product of Digits of Number
- C++ Sum of Squares of Digits
- C++ Interchange Digits of Number
- C++ if else Programs
- C++ Check Even or Odd
- C++ Check Prime or Not
- C++ Check Alphabet or Not
- C++ Check Vowel or Not
- C++ Check Leap Year or Not
- Check Reverse equal Original
- C++ Check Perfect Number
- C++ Check Palindrome or Not
- C++ Check Armstrong or Not
- C++ Divisibility Test
- C++ Find Wage of Labor
- C++ Find Discounted Price
- C++ Find Shipping Charge
- C++ Find Telephone Bills
- C++ Calculate Student Grade
- C++ Largest of Two Numbers
- C++ Largest of Three Numbers
- C++ Number Conversion
- C++ Decimal to Binary
- C++ Decimal to Octal
- C++ Decimal to Hexadecimal
- C++ Binary to Decimal
- C++ Binary to Octal
- C++ Binary to Hexadecimal
- C++ Octal to Decimal
- C++ Octal to Binary
- C++ Octal to Hexadecimal
- C++ Hexadecimal to Decimal
- C++ Hexadecimal to Binary
- C++ Hexadecimal to Octal
- C++ Pattern Programs
- C++ Pattern Programs
- C++ Print Diamond Pattern
- C++ Print Floyd's Triangle
- C++ Print Pascal's Triangle
- C++ Array Programs
- C++ 1D Array Program
- C++ Linear Search
- C++ Binary Search
- Find Largest Element in Array
- Find Smallest Element in Array
- Find Second Largest Element
- Find Second Smallest Element
- C++ Sum of All Elements
- C++ Multiply All Elements
- C++ Element on Even Position
- C++ Element on Odd Position
- C++ Print Even Numbers in Array
- C++ Print Odd Numbers in Array
- C++ Count Even/Odd Numbers
- C++ Sum of Even/Odd Numbers
- C++ Count Positive Negative Zero
- C++ Reverse an Array
- C++ Insert Element in Array
- C++ Delete Element from Array
- C++ Merge two Arrays
- C++ Bubble Sort
- C++ Selection Sort
- C++ Insertion Sort
- C++ Common Elements
- C++ 2D Array Programs
- C++ Add Two Matrices
- C++ Subtract Two Matrices
- C++ Transpose Matrix
- C++ Multiply Two Matrices
- C++ 3D Array Programs
- C++ String Programs
- C++ Print String
- C++ Find Length of String
- C++ Compare Two Strings
- C++ Copy String
- C++ Concatenate String
- C++ Reverse a String
- C++ Delete Vowels from String
- C++ Delete Word from String
- C++ Count Character in String
- C++ Count Word in String
- C++ Frequency of Word
- C++ Remove Spaces from String
- C++ Sort a String
- C++ Uppercase to Lowercase
- C++ Lowercase to Uppercase
- C++ Swap Two Strings
- C++ Check Anagram or Not
- C++ Capitalize All Words in String
- C++ Capitalize Specific Character
- C++ Get Numbers from String
- C++ File Programs
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- C++ Write Content to File
- C++ Append Data in File
- C++ Read & Display File
- C++ Copy a File
- C++ Merge Two Files
- Count Characters, Words in File
- C++ Capitalize All Words in File
- C++ List Files in Directory
- C++ Delete a File
- C++ Encrypt & Decrypt a File
- C++ Misc Programs
- C++ Print ASCII Value
- C++ Add Binary Numbers
- C++ Generate Random Numbers
- C++ Print Smiling Face
- C++ Days into Years, Months
- Add Two Numbers using Pointer
- C++ Print Fibonacci Series
- Generate Armstrong Numbers
- C++ Find nCr and nPr
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- C++ Print Date/Time
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C++ Program to Find Smallest Number in Array
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 without function and pointer
- Using Pointer
- Using user-defined Function
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:
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:
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:
- When user enters the size say 5 for the array, then it gets stored in tot. So tot=6
- Now we've created a for loop that executes 6 times. That is, the loop variable, i starts from 0 to 5
- So at first time, the first number gets stored in arr[0], second number in arr[1] and so on
- Therefore, if user enters 5 numbers as 5, 4, 3, 1, 2, then it gets stored in arr[] in this way:
- arr[0]=5
- arr[1]=4
- arr[2]=3
- arr[3]=1
- arr[4]=2
- Now the statement that is used to suppose the first number as the smallest number. That is, arr[0] or 5 gets initialized to s
- Now using the second for loop, we've compared the value of s with each and every element of arr[]
- That is, at first execution of for loop, 1 gets initialized to i, and the condition i<tot or 1<5 evaluates to be true, therefore program flow goes inside the loop, and the condition s>arr[i] or 5>arr[1] or 5>4 evaluates to be true, therefore program flow goes inside the if's body and the value of arr[i] or arr[1] or 4 gets initialized to s
- Now program flow goes to update part of for loop and increments the value of i. So i=2
- Now the condition of for loop again gets evaluated. Every time before entering into the body of loop, condition must evaluated to be true
- This time again the condition i<tot or 2<5 evaluates to be true, therefore program flow again goes inside the loop
- This process continues until the condition evaluates to be false
- After exiting from the loop, the variable s holds the smallest number from given list of numbers stored in arr[]
- So just print the value of s as smallest number from an array entered by user
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:
Same Program in Other Languages
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