Program

Here is the complete program. Note how the comments follow the flowchart.

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

int main()
{
  double base, scale;
  int raw, score, count=0;

  /* Initialize */
  printf("Enter base -->");
  scanf("%lf", &base);
  printf("Enter scale -->");
  scanf("%lf", &scale);

  /* Get first raw score */
  printf("Score 1 -->");
  scanf("%d", &raw);

  /* Loop while raw score is not negative */
  while (raw >= 0)
  {
    if (raw <= 300)
    {
      /* Convert and print the raw score */
      count++;
      score = (int)round(base + scale*raw);
      printf("Scaled Score: %d\n", score);
    }
    else
      printf("That value is out of range\n");

    /* Get next raw score */
    printf("Score %2d-->", count + 1);
    scanf("%d", &raw);
  }

  /* Summarize */
  printf("%3d scores processed.", count);
}

If you try to compile and run this program on a recent version of Microsoft VC++ it will ask you to replace scan with scan_s for increased security. Go ahead and do that.

double round( double val ) rounds its double precision argument to the nearest double precision integer. A value like 3.4 is rounded to 3.0. A value like 3.6 is rounded to 4.0. Not all C environments have it. If they do, you need to include math.h.