DDA Line Drawing Program in C

#include<stdio.h>
#include<dos.h>
#include<graphics.h>
#include<math.h>
#include<conio.h>

void lineDDA(int x1, int y1, int x2, int y2) {

    int dx,dy,steps,k,x,y,xincrement, yincrement;

    dx = x2-x1;
    dy = y2-y1;

    if(abs(dx)>abs(dy))
        steps = abs(dx);
    else
        steps = abs(dy);

    xincrement = dx/steps;
    yincrement = dy/steps;

    x = x1;
    y = y1;
    putpixel(x,y,67);

    for(k=0;k<steps;k++) {

        x += xincrement;
        y += yincrement;
        putpixel(x,y,67);

        delay(20);
    }

}

void main() {

    int x1,y1,x2,y2;

    int gd = DETECT, gm = DETECT;
    initgraph(&gd, &gm, "");

    printf("Enter the starting coordinates of line:\n");
    scanf("%d %d", &x1, &y1);
    printf("Enter the ending coordinates of line:\n");
    scanf("%d %d", &x2, &y2);

    lineDDA(x1, y1, x2, y2);

    getch();
}

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