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DSL

17: Problem statement:

Write C++ program to store second year percentage of students in array. Write function for sorting array of floating point numbers in ascending order using
a) Insertion sort
b) Shell Sort and display top five scores.


Program:


#include<stdio.h>

void insertion(float [],int);
void shell(float[],int);

int main()
{
    int i, n,op;
    float a[30];

    do
    {
        printf("\n 1)Insertion Sort \n 2) Shell Sort  \n 3) Quit");
        printf("Enter your choice :");
        scanf("%d",&op);

        if(op==1)
        {
            printf("\n Enter no. of elements :");
            scanf("%d",&n);
            printf("\n Enter Array elements :");
            for(i=0;i<n;i++)
                scanf("%f",&a[i]);
            insertion(a,n);
            printf("\n Sorted array is :");
            for(i=n-1;i>=n-5;i--)
                printf("%7.2f",a[i]);

        }

        if(op==2)
        {
            printf("\n Enter no. of elements :");
            scanf("%d",&n);
            printf("\n Enter Array elements :");
            for(i=0;i<n;i++)
                scanf("%f",&a[i]);
            shell(a,n);
            printf("\n Sorted array is :");
            for(i=n-1;i>=n-5;i--)
                printf("%7.2f",a[i]);
        }

    }while(op!=3);
    return 0;
}


void shell(float a[],int n)
{
    int i,j,step;
    float temp;
    for(step=n/2;step>0;step=step/2)
    {
        for(i=step;i<n;i++)
        {
            temp=a[i];
            for(j=i;j>=step;j=j-step)
                if(temp<a[j-step])
                    a[j]= a[j-step];
                else
                    break;
            a[j]=temp;
        }

    }
}
void insertion(float a[],int n)
{
    int i,j;
    float temp;
    for(i=1; i<n;i++)
    {
        temp=a[i];
        for(j=i-1;j>=0 && a[j]>temp;j--)
            a[j+1]=a[j];
        a[j+1]=temp;

    }
}

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