Write Program using fprintf() print single floating point number right justified.......?

Question

Using fprintf() print a single floating point number right-justified in a field of 20 spaces, no leading zeros, and 4 decimal places. The destination should be stderr and the variable is called num.

Answer 1

#include <stdio.h>

int main ()
{
   FILE *fp;
   int c;

   fp = fopen("file.txt","r");
   while(1)
   {
      c = fgetc(fp);
      if( feof(fp) )
      {
         break;
      }
      printf("%c", c);
   }
   fclose(fp);
   return(0);
}

Let us compile and run above program to produce the following result.

We are in 2012

Answer 2

Here is my ans, If I have correctly understood your question. Pleas have a look.

#include <stdio.h>

int main()
{
    float num = 0;

    printf("Enter the number:\n");
    scanf("%f", &num);

    fprintf(stderr, "output (as suggested): %20.4f\n", num);

    return 0;
}

Sample input output:

1.
 Enter the number:
 20.123
 output (as suggested):                    20.1230

 2.
  Enter the number:
  133.123456
  output (as suggested):                    133.1234