100% prog to compute norm-2 of a given vector and display it

#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

  int i,n;

  float c[4], norm2c,total=0.0; // c is a vector whose norm has to be calculated

  clrscr();

  printf("enter the no of rows of the column vector 1 to 4:"); /* we are assuming max size of the vector as 4*/

  scanf("%d",&n);

  for (i=0;i<n;i++)

  {

    printf("\n enter the c[%d] element:",i); // it can be float number 

    scanf("%f",&c[i]);

   } // till now we have entered the values of the vector

   /* now we need square each if the element and add them up*/

  for (i=0;i<n;i++)

  {

    total=total+c[i]*c[i];

   }

   /* now let's take square root to get the norm */

  norm2c=sqrt(total);

 printf("\n norm-2 of given vector= %f", norm2c);

}

ఔట్పుట్  తెరమీద 

enter the no of rows of the column vector 1 to 4:4
enter the c[0] element:1
enter the c[1] element:-1
enter the c[2] element:2
enter the c[3] element:1
norm-2 of given vector= 2.645751

enter the no of rows of the column vector 1 to 4:3
enter the c[0] element:1.0
enter the c[1] element:0
enter the c[2] element:-1.0
norm-2 of given vector= 1.414214

enter the no of rows of the column vector 1 to 4:2
enter the c[0] element:0
enter the c[1] element:0.0
norm-2 of given vector= 0.000000 

గమనిక = ఒక వెక్టార్ యొక్క norm-2 విలువ  సున్నా 0 వస్తే ఆ వెక్టార్ లో అన్ని elements సున్నా అని గుర్తించగలరు

/*though this program gives correct output, this is not efficient program. we could have used just 1 for loop and reduced the code length, execution time*/