Below is the code for the programs we wrote on day 3 of PACE 1.

Program 1: Table of value from a quadratic, using a for statement

#include <stdio.h>

void main ()
{
            /*   Initialize variables   */
            float a,b,c,start,stop,increment,x,y,numberofvalues;
            int n=0;

            /*   Input/Output   */
            printf("The following program will ask for the coefficients of a quadratic and then make a table of values for the funciton.\n\n");
            printf("Input the coefficient a in ax^2+bx+c ");
            scanf("%f",&a);
            printf("Input the coefficient b in ax^2+bx+c ");
            scanf("%f",&b);
            printf("Input the coefficient c in ax^2+bx+c ");
            scanf("%f",&c);
            printf("The x value to start the table. ");
            scanf("%f",&start);
            printf("The x value to stop the table. ");
            scanf("%f",&stop);
            printf("Number of values in the table. ");
            scanf("%f",&numberofvalues);

            /*   Sets the delta x  & starting point */
            increment=((stop-start)/numberofvalues);
x=start-increment;

           FILE * qFile;
            qFile = fopen ("QuadaticFor.xls","w");

            fprintf (qFile, “The following program makes a table of values for the function below.\n”);
fprintf (qFile, "%fx^2 + %fx + %f\n\n",a,b,c);
            fprintf (qFile,"x\ty\n");

             for (n=0;n<=numberofvalues;n++) {
                        x=x+increment;
                        y=a*x*x+b*x+c;
                        fprintf (qFile,"%f\t%f\n",x,y);
            }

}

Program 2: Table of positive values of the dependent variable from a quadratic, using a while statement

#include <stdio.h>

void main()
{
            int time=0;
            float poly, ttime, a, b, increment;
                       

            printf ("Input the leading coefficient\t");
            scanf ("%f", &a);
            printf ("Input the initial condition\t");
            scanf ("%f", &b);
            printf ("Input the increment to count by\t");
            scanf ("%f", &increment);           

            FILE *qFile;
            qFile=fopen ("PolyOutput.xls","w");
            fprintf (qFile,"Polynomial Model\n\nTime(s)\tValue\n");

while (poly>=0)
            {
                        ttime=increment*time;
                        poly=a*ttime*ttime+b;
                        if (poly>0) fprintf (qFile,"%.2f\t%.2f\n",ttime,poly);
                        time++;

            }

}