C Program To Draw Bar Diagram With Data

In this article, you will learn to write a C program to draw bar diagram with data input by user.

This program is written using Turbo C++ compiler installed on a Windows 7 64-bit PC. The compiler supports C language and the header Graphics.h is used to draw the chart.

Problem Definition

In this C example program, you will do following task:

• Ask user to input data for the bar diagram.
• Initialize the graph.
• Choose correct position on the screen to draw the graph.
• Write the labels for bars.
• Draw the bars according to data input by user.
• Close the graph.

For the purpose of this example:

In a university the number of application received in last five years is given below. Write a C program to display the data using bar chart.

Year	Number of Students
2013	20
2014	100
2015	70
2016	50
2017	120

Program Code – Bar Diagram With Data

/* C++ Program To Display following data:
 Year     No. Of Students
 2013           20
 2014           100
 2015           70
 2016           50
 2017           120
 ------------------------------ */
 include "graphics.h"
 include "stdlib.h"
 include "stdio.h"
 include "conio.h"
 include "dos.h"
 int main(void)
 {
    int gdriver=DETECT, gmode;
    int n,i,x1,x2,y1,y2, yr = 1950;
 /* Initialize the Graph */
 initgraph(&gdriver,&gmode,"D:\TurboC3\BGI");
 /* Initialize the variable */
 x1 = 50;
    x2 = 50;
    y1 = 350;
    y2 = 350;
 clrscr();
 /* Display the data label year */
 outtextxy(90,375,"1950");
    outtextxy(140,375,"1955");
    outtextxy(190,375,"1960");
    outtextxy(240,375,"1965");
    outtextxy(290,375,"1970");
    printf("\t\t\tBAR CHART\n");
 /* Set Color of the bar chart */
 setfillstyle(SOLID_FILL,RED);
 /* Display the data */
 for(i=1;i<=5;i++)
    {
       printf("\nYear = %d Students:",yr);
       scanf("%d",&n);
   y2=y2-n;   x2=x2+50;   x1=x2+10;   bar(x1,y1,x2,y2);   yr=yr+5;   y2 = 350;
 }
 /* Close the Graph */
 getch();
    closegraph();
    return 0;
    }

Output - Bar Diagram With Data