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Find maximum and minimum number in array c++ code

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This Tutorial contains:
  • C++ code to find maximum and minimum number in array 
  • Program basic working what is used in program and how 
  • Dry run of the program with respect to variable values for better under standing
Concept used:

Write a program to find maximum and minimum number in array using for loop and if statement.
To initialize array use random numbers

Program should display all random elements of array and minimum and maximum number in array
on the output console.

Program Explanation:
  • Array size is fixed to 100 to change the size just change the value of size integer
  • In the for loop array is initializing with a random number less than 100 to change the range just replace 100 by any desired number and it will produced numbers between 0 to a number you replaced
  • In another for loop which programs go through from start of the array to the end and with contains two if statements which checks for both minimum and maximum number in array
c++ code

#include<iostream>
#include<cstdlib>
#include<ctime>

using namespace std;
int main()
{
const int size=50;
// array with size of 50
int array[size];
// for random numbers
srand(time(0));
    for(int i=0;i<size;i++){
    // Initializing Array number is less than 100
    array[i]=rand()%100;
    // Displaying array value
    cout<<array[i]<<endl;
    }
            // initializing max, min
                int max=array[0];
                int min=array[0];
/* scanning array to find
   minimum and maximum
   number  */
for(int i=0;i<size;i++){
    // finding minimum number in array
      if(min>array[i]){
         min=array[i];
      }
      //finding maximum number in array
      if(max<array[i]){
      max=array[i];
      }
}
       // displaying output
        cout<<"Maximum Number is :"<<max<<endl;
        cout<<"Minimum Number  is:"<<min<<endl;

return 0;
}


Dry running the code with a simple input so it will be easy to understand the working of program.

let there are five random values in array
55, 3, 2, 44, 100

we will run our main loop in which two if statements are used 
for(int i=0;i<size;i++){
    // finding minimum number in array
      if(min>array[i]){
         min=array[i];
      }
      //finding maximum number in array
      if(max<array[i]){
      max=array[i];
      }
}


before the start of the loop 
max=55; min=55;

i=0;  current array elements 55, 3, 2, 44, 100

min > array[i]
55   > 55    => condition false

max < array[i]
55   > 55    => condition false
------------------------------------------------------

i=1; current array elements 55, 3, 2, 44, 100

min > array[i]
55   > 3    => condition TRUE UPDATE  min =3;

max < array[i]
55    < 3    => condition false  max=55
------------------------------------------------------


i=2; current array elements 55, 3, 2, 44, 100

min > array[i]
3   >    2   => condition TRUE UPDATE  min =2;

max < array[i]
55   <  2    => condition false
------------------------------------------------------


i=3; current array elements 55, 3, 2, 44, 100

min > array[i]2   > 55    => condition false

max < array[i]
55   > 44    => condition false
------------------------------------------------------


i=4; current array elements 55, 3, 2, 44, 100

min > array[i]2   >  100    => condition false

max < array[i]
55   < 100   => condition TRUE UPDATE  max =100;
------------------------------------------------------


Hope this will be helpful.
find more codes here C++ Simple Examples

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