How do I make the text bigger in C programming graphics

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I have tired and tried, but all i get is errors.

What I have tried:

Here is an example

#include <graphics.h>
 
main()
{
   int gd = DETECT, gm, x = 25, y = 25, font = 0;
 
   initgraph(&gd,&gm,"NULL");
 
   for (font = 0; font <= 10; font++)
   {
      settextstyle(font, HORIZ_DIR, 1);
      outtextxy(x, y, "Text with different fonts");
      y = y + 25;
   }
 
   getch();
   closegraph();
   return 0;
}

In function ‘int main()’:
warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]
    initgraph(&gd,&gm,"NULL");
                            ^
error: ‘HORIZ_DIR’ was not declared in this scope
       settextstyle(font, HORIZ_DIR, 1);
                          ^
error: ‘settextstyle’ was not declared in this scope
       settextstyle(font, HORIZ_DIR, 1);
                                      ^
warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]
       outtextxy(x, y, "Text with different fonts");

Posted 3-Apr-16 23:41pm

Member 12435024

Updated 4-Apr-16 0:41am

Jochen Arndt

v2

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Jochen Arndt · Answer 1 · 2016-04-04T00:41:00

To avoid the warnings add this line on top of your source file:

C++

# pragma GCC diagnostic ignored "-Wwrite-strings"

The initgraph call should probably be changed to pass NULL instead of the string parameter "NULL":

initgraph(&gd,&gm,NULL);

Finally to the bad news. It seems that the Linux porting of the BGI (Borland Graphics Interface) does not support text styles. The header file graphics.h includes another header file grtext.h which provides definitions for outtextxy() but not for settextstyle() and constants related to that function like HORIZ_DIR.

You might think about using other graphic interfaces than a Linux port of an outdated graphics driver interface that was initially provided with Turbo C/C++ for MS-DOS and Windows 95.