C Program to check if mouse support is available or not.

Program :

#include<stdio.h>
#include<dos.h>
int initmouse();
union REGS i, o;
int main() {
   int flag;
   flag = initmouse();
   if (flag == 0) {
      printf("Mouse support not available.");
   } else {
      printf("Mouse support available.");
   }
   return 0;
}
int initmouse() {
   i.x.ax = 0;
   int86(0X33, &i, &o);
   return (o.x.ax);
}

#include<stdio.h>

#include<dos.h>

int initmouse();

union REGS i, o;

int main() {

int flag;

flag = initmouse();

if (flag == 0) {

printf("Mouse support not available.");

} else {

printf("Mouse support available.");

}

return 0;

}

int initmouse() {

i.x.ax = 0;

int86(0X33, &i, &o);

return (o.x.ax);

}

Output :

Mouse support available.

1	Mouse support available.

Explanation :

Int86() is a C function that allows to call interrupts in the C program
Header File : dos.h

Usage is int86 (int intr num, union REGS *inregs,
                                  union REGS *outregs)

1 2	Usage is int86 (int intr num, union REGS inregs, union REGS outregs)

In and out register must be type of REGS.
REGS is a built in UNION declaration in C.
It is defined in the header file <dos.h>

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C Program to check if mouse support is available or not.