Question

3. Write a C++ program that does the following: Write a function (smallestindex) that has two parameters: an array containing elements of type int and the length of the array. The function returns the index of the array's smallest element. ii. Use the main function to call the smallestindex function

can you comment so that I may understand how it works.

Answer 1

#include<iostream.h>
int smallestindex(int a[],int lenght) //function prototype
{
   int index=0,i;
   for(i=0;i<lenght;i++)
   {
   if(a[index]>a[i]) // logic to find least number
       {
       index=i; //least number index
       }
   }
   return index;
}

int main()
{
   int a[50],length,i,result;
   cout<<endl<<"Enter the size of the array : ";
   cin>>length;
   cout<<endl<<"Enter the elements"<<endl;
   for(i=0;i<length;i++) //reading elements into array
   {
       cin>>a[i];
   }
   cout<<endl<<"Elements in the array are : "<<endl;
   for(i=0;i<length;i++)
   {
       cout<<a[i]<<"\t"; //displaying array elements
   }
   result=smallestindex(a,length); //function call
   cout<<endl<<"The index of the smallest element in the given array is : "<<result;
   return 0;
}

Screenshots:

DOS BOX 1 DOSBox 0.74, Cpu speed: max 100% cycles, Frameskip 0, Program: TC File Edit Search Run Compile Debug Project Options Window Help =[1] INDEX.CPP 1=[+]91 #include<iostream.h> int smallest index(int all, int lenght) //function prototype { int index=0, i; for(i=0; i<lenght; i++) { if (a[index]>a[i]) // logic to find least number { index=i; //least number index } } return index;

int main() { int a[50], length, i, result; cout<<endl<< 'Enter the size of the array cin>>length; cout<<endl<< 'Enter the elements "<<endl; for(i=0; i<length; i++) //reading elements into array { cin>>a[i]; } cout<<endl<< 'Elements in the array are : "<<endl; for(i=0; i<length; i++) { cout<<a[i]<<"\t'; //displaying array elements } result=smallest index(a, length); [/function call cout<<endl<< The index of the smallest element in the given array is return 0;

Output:

38. DOSBox 0.74, Cpu speed: max 100% cycles, Frameskip 0, Program: TC х Enter the size of the array : 5 Enter the elements 10 20 30 5 40 Elements in the array are : 10 20 30 5 The index of the smallest element in the given array is : 3 40

Run 2:

38. DOSBox 0.74, Cpu speed: max 100% cycles, Frameskip 0, Program: TC - х 10 Enter the size of the array Enter the elements 10 20 30 40 5 60 70 90 2 56 Elements in the array are : 10 20 30 40 5 60 70 90 2 56 The index of the smallest element in the given array is : 8