Need your opinion about this one: (currently using Turbo C v2.01)

Code:
#include <stdio.h>

int process;

main() {
    char choice;
    clrscr();

    printf ("Process Scheduling\nProgrammed by: Sanchez, Anthony Ray D.\n");
    printf ("\nSelect CPU Scheduling type:\n\n");
    printf ("\t1. First Come, First Served (FCFS)\n");
    printf ("\t2. Shortest Job First (SJF)\n");
    printf ("\t3. Priority Scheduling (PS)\n");
    printf ("\t4. Exit Program\n\n");
    printf ("Enter your desired type: ");
    scanf  ("%c", &choice);
    printf ("Enter no. of process: ");
    scanf  ("%d", &process);

    switch (choice) {
        case '1':
            FCFS();
            getch();
            break;
        case '2':
            SJF();
            getch();
            break;
        case '3':
            PS();
            getch();
            break;
        case '4':
            clrscr();
            printf ("The program has been successfully closed.");
            getch();
            exit();
        default:
            printf ("Invalid entry, please try again.\n");
            printf ("Press any key to continue.");
            getch();
    }
}

FCFS() {
    int ctr, PT[process]; /*I want this to have dimensions based on the value of variable "process" */
    float WT=0, AWT=0;
    clrscr();

    printf ("First Come, First Served Algorithm\n");

    for (ctr=1; ctr<=process; ctr++) {
        printf ("Enter Processing time for P%d: ", ctr);
        scanf  ("%d", &PT[ctr-1]);
    }

    printf ("\nProcess\t\tArrival Time\tCPU Burst\n");

    for (ctr=0; ctr<=process-1; ctr++)
        printf ("%d\t\t%d\t\t%d\n", ctr+1, ctr, PT[ctr]);

    for (ctr=0; ctr<=process-1; ctr++)
        WT = WT + PT[ctr];

    AWT = WT/process;
    printf ("\nAve. Waiting Time (AWT) = %.2f", AWT);
    return;
} /* Other program lines follows... */
Although someone here already pointed out the use of dynamic memory, but I dont have idea on how to use/make it.