C Program To Find Mean, Median, Standard Deviation And Mode For A Given Set Of Values

/* C Program To Find Mean, Median, Standard Deviation And Mode For A Given Set Of Values */


#include<stdio.h>
#include<math.h>
#include<conio.h>

void main()
{
    int a[10],b[10],i,j,k=0,temp,sum=0,n,choice,count=1,max=0,mode;

    float mean=0,median=0,sd,x,add=0,adds=0;
    printf("Enter the size of array:\n");
        scanf("%d",&n);
    printf("Enter The elements:\n");
        for(i=0;i<n;i++)
        {
            scanf("%d",&a[i]);
        }
      printf("Elements before sorting:\n");
         for(i=0;i<n;i++){
            printf("%d\n",a[i]);
         }

      for(i=0;i<n;i++)
      {
          for(j=0;j<n-1;j++)
          {

              if(a[j]>a[j+1])
              {
                  temp=a[j];
                  a[j]=a[j+1];
                  a[j+1]=temp;
              }
          }
      }
      printf("Sorted Elements:\n");
         for(i=0;i<n;i++)
            printf("%d\n",a[i]);


      for(;;)
      {
          printf("1.Mean\t2.Median\t3.Standard Deviation\t4.Mode\t5.Exit\n");
            scanf("%d",&choice);

           switch(choice)
           {
           case 1:
            for(i=0;i<n;i++)
            {
                sum+=a[i];
                mean=(float)sum/n;
            }
            printf("Mean= %.2f\n",mean);
            break;
           case 2:
               if(n/2==0){
                median=a[n/2];
                printf("Median= %f\n",median);
                break;
               }
               else
                median=(a[n/2]+a[n/2]+1)/2;

               printf("Median= %.2f\n",median);
               break;
            case 3:
            for(i=0;i<n;i++)
               add+=a[i];
                mean=add/n;
            for(i=0;i<n;i++)
                    adds+=adds+((a[i]-mean)*(a[i]-mean));
            x=adds/n;
            sd=sqrt(x);
            printf("Standard deviation= %.2f\n",sd);
            break;

            case 4:
                for(i=0;i<n-1;i++)
                    {
                        mode=0;
                    for(j=i+1;j<n;j++)
                    {
                        if(a[i]==a[j])
                        {
                            mode++;
                        }
                    }
                if((mode>max)&&(mode!=0))
                    {
                        k=0;
                        max=mode;
                        b[k]=a[i];
                        k++;
                    }
                else if(mode==max)
                    {
                        b[k]=a[i];
                        k++;
                    }
                }
            for(i=0;i<n;i++)
                {
                    if(a[i]==b[i])
                    count++;
                }
            if(count==n)
            printf("There is no mode!\n");
            else
            {
                printf("Mode:\n");
                for(i=0;i<k;i++)
                printf("%d\n",b[i]);
            }

                break;
            case 5:
                exit(0);

            default:
                printf("Invalid Choice!\n");
                break;
           }
      }

}

Out Put:

Enter the size of array:
6
Enter The elements:
2
3
4
8
2
5
Elements before sorting:
2
3
4
8
2
5
Sorted Elements:
2
2
3
4
5
8
1.Mean  2.Median        3.Standard Deviation    4.Mode  5.Exit
1
Mean= 4.00
1.Mean  2.Median        3.Standard Deviation    4.Mode  5.Exit
2
Median= 4.00
1.Mean  2.Median        3.Standard Deviation    4.Mode  5.Exit
3
Standard deviation= 6.03
1.Mean  2.Median        3.Standard Deviation    4.Mode  5.Exit
4
Mode:
2
1.Mean  2.Median        3.Standard Deviation    4.Mode  5.Exit
5