The linker gives error that overflow at initgraph and close graph
#include<dos.h>
#define DETECT 0
union REGS in,out;
void detectmouse()//no declaration(prototype)?
{
in.x.ax=0;
int86(0x33,&in,&out);
if(out.x.ax==0)
{
printf("Fail to initialize the mouse.");
}
else
{
printf("Mouse succesfully initialized.");
}
getch();
}
void showmousegraphics()//show mouse in graphics mode
{
int driver=DETECT,mode;
initgraph(&driver,&mode,"c:\\tc\\bgi");
in.x.ax=1;
int86(0X33,&in,&out);
getch();
closegraph();
}
void main()
{
detectmouse();
showmousegraphics();
}
Ahh, you're probably using some old compiler for DOS. In that case, you have to choose large memory model when compiling, so that you can have more than 64kB of code.
Related
I have an assignment to produce a program that will compare students answer to the answer key, and display the incorrect answers. The program then produces a report of the students incorrect answers and his final grade. The Program must use arrays and functions.
Currently I am trying to code two functions one to read the students answer file and store it in an array and the other to read answer key file and store it in another array. Then the functions will return both arrays to the main function later to be sent to another function to compare their contents(not yet done).
My problem with this code after pressing F11 to compile and run, i get a blank execution screen and a notification saying that the program has stopped working.
If my code contains a mistake or my approach is incorrect please tell me how to fix it.
note: this is my first semester learning C programming.
Thank you.
#include<stdio.h>
#include<conio.h>
#include<math.h>
#include<stdlib.h>
//Modules
char* readstudent()
{
FILE*s_ans;
int i,j;
static char arrs[20];
s_ans=fopen("trial2.txt","r");
if (s_ans == NULL)//check if file can be opened
{
printf("error student");
}
while(!feof(s_ans))
{
for(j=0;j<20;j++)
{
fscanf(s_ans,"%s",arrs[j]);
}
}
printf("ReadStudent\n");
for(i=0;i<20;i++)
{
printf("%d\t %s\n",i+1,arrs[i]);
}
return arrs;
}
char* readcorrect()
{
FILE*c_ans;
int x,i;
static char arrc[20];
c_ans=fopen("CorrectAnswers.txt","r");
if (c_ans == NULL)//check if file can be opened
{
printf("error correct");
}
while(!feof(c_ans))
{
for(x=0;x<20;x++)
{
fscanf(c_ans,"%s",arrc[x]);
}
}
printf("ReadCorrect\n");
for(i=0;i<20;i++)
{
printf("%d\t %s\n",i+1,arrc[i]);
}
return arrc;
}
//Main
int main()
{
int i,j,n,x;
char* as_ans=readstudent();
char* ac_ans=readcorrect();
printf("Main");
for(i=0;i<20;i++)
{
printf("%s",as_ans[i]);
}
return 0;
}
I am developping a game with allegro library. I wrote a starter C code then I compile the program on Ubuntu Terminal.After that When I open the output program,the program open but not closed.Cancel Button(X) is not working.
Here is my starter code:
#include <allegro.h>
void Baslat();
void Bitir();
int main(){
Baslat();
while(!key[KEY_ESC]){
}
Bitir();
return 0;
}
END_OF_MAIN()
void Baslat(){
int depth,res;
allegro_init();
depth = desktop_color_depth();
if(depth == 0) depth=32;
set_color_depth(depth);
res=set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640,480,0,0);
if(res!=0){
allegro_message("%s\n", allegro_error); exit(-1);
}
install_timer();
install_keyboard();
install_mouse();
}
void Bitir(){
clear_keybuf();
}
To respond to a user pressing the X button in allegro5, you must catch ALLEGRO_EVENT_DISPLAY_CLOSE. This tutorial provides an example of responding to that event.
i am tring to solve this http://www.spoj.com/problems/LEXISORT/ question
it working fine in visual studio compiler and IDEone also but when i running in SPOJ compiler it is getting SEGSIGV error
Here my code goes
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
char *getString();
void lexisort(char **str,int num);
void countsort(char **str,int i,int num);
int main()
{
int num_test;
int num_strings;
char **str;
int i,j;
scanf("%d",&num_test);
for(i=0;i<num_test;i++)
{
scanf("%d",&num_strings);
str=(char **)malloc(sizeof(char *)*num_strings);
for(j=0;j<num_strings;j++)
{
str[j]=(char *)malloc(sizeof(char)*11);
scanf("%s",str[j]);
}
lexisort(str,num_strings);
for(j=0;j<num_strings;j++)
{
printf("%s\n",str[j]);
free(str[j]);
}
free(str);
}
return 0;
}
void lexisort(char **str,int num)
{
int i;
for(i=9;i>=0;i--)
{
countsort(str,i,num);
}
}
void countsort(char **str,int i,int num)
{
int buff[52]={0,0},k,x;
char **temp=(char **)malloc(sizeof(char *)*num);
for(k=0;k<52;k++)
{
buff[k]=0;
}
for(k=0;k<num;k++)
{
if(str[k][i]>='A' && str[k][i]<='Z')
{
buff[(str[k][i]-'A')]++;
}
else
{
buff[26+(str[k][i]-'a')]++;
}
}
for(k=1;k<52;k++)
{
buff[k]=buff[k]+buff[k-1];
}
for(k=num-1;k>=0;k--)
{
if(str[k][i]>='A' && str[k][i]<='Z')
{
x=buff[(str[k][i]-'A')];
temp[x-1]=str[k];
buff[(str[k][i]-'A')]--;
}
else
{
x=buff[26+(str[k][i]-'a')];
temp[x-1]=str[k];
buff[26+(str[k][i]-'a')]--;
}
}
for(k=0;k<num;k++)
{
str[k]=temp[k];
}
free(temp);
}
Generally speaking, these online judge programs give an example input (in this case, that input appears to work perfectly), but also use a set of harder hidden inputs.
In this case, what happens if the input string has a space in it? For example, an input of:
1
2
hello orld
whateverss
In this case, your scanf("%s",str[j]); will not properly read that input line. I'd suggest switching over to a getline style interface, rather than a scanf style interface.
I have to write a program to determine the longest common sub sequence.
Input:
The first argument will be a file that contains two strings per line, semicolon delimited. You can assume that there is only one unique subsequence per test case. e.g.
XMJYAUZ;MZJAWXU
Output:
The longest common subsequence. Ensure that there are no trailing empty spaces on each line you print. e.g.
MJAU
I am using Dev C++ .. And it is compiling Fine!...But this question is a programming challenge and when i submit my answer it's showing me a segmentation fault!
I have written the following code and i am getting a Segmentation Fault where am i wrong?
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
char str1[100],str2[100];
int len1;
int len2;
void printLCS(char b[len1][len2],char str1[],int i,int j)
{
if(i==0 || j==0)
return;
if(b[i][j]=='c')
{
printLCS(b,str1,i-1,j-1);
printf("%c",str1[i-1]);
}
else if(b[i][j]=='l')
printLCS(b,str1,i,j-1);
else
printLCS(b,str1,i-1,j);
}
void Seq(char str1[],char str2[])
{
int i,j;
len1=strlen(str1);
len2=strlen(str2);
int LCS[len1+1][len2+1];
char b[len1][len2];
for(i=0;i<=len1;i++)
{
LCS[i][0]=0;
}
for(j=0;j<=len2;j++)
{
LCS[0][j]=0;
}
for(i=1;i<=len1;i++)
{
for(j=1;j<=len2;j++)
{
if(str1[i-1]==str2[j-1])
{
LCS[i][j]=1+LCS[i-1][j-1];
b[i][j]='c';
}
else if(LCS[i-1][j]>=LCS[i][j-1])
{
LCS[i][j]=LCS[i-1][j];
b[i][j]='u';
}
else
{
LCS[i][j]=LCS[i][j-1];
b[i][j]='l';
}
}
}
printLCS(b,str1,len1,len2);
}
int main(int argc,char *argv[])
{
if(argc!=2)
{
printf("Invalid Number of Arguments:\n");
exit(0);
}
FILE *fp;
fp=fopen(argv[1],"r");
if(fp==NULL)
{
printf("File can't be opened:\n");
exit(0);
}
char c;
c=fgetc(fp);
while(c!=EOF)
{
int k=0;
if(c=='\n')
c=fgetc(fp);
while(c!=';')
{
str1[k]=c;
k++;
c=fgetc(fp);
}
str1[k]='\0';
c=fgetc(fp);
k=0;
while(c!=EOF && c!='\n')
{
str2[k]=c;
k++;
c=fgetc(fp);
}
str2[k]='\0';
Seq(str1,str2);
printf("\n");
if(c==EOF)
{
break;
}
else
c=fgetc(fp);
}
return 0;
}
I dont know system of this site but;
i compiled with no error,
and result was true.
You didnt close file. Maybe memory leak etc. didnt allowed by site.
And, dont use global variables, unless you dont know another solution
this usage is very very bad! ISO C90 forbids this, anyway
int len1;
int len2;
void printLCS(char b[len1][len2]...
good luck.
If you've got access to a Mac or Linux system, there's a fantastic tool called valgrind which can help you track down these kinds of errors: basically it runs your program in a virtual machine and monitors what it reads and writes to memory.
Whilst I can't compile your code, I'm pretty suspicious about this for loop:
for(i=1;i<=len1;i++)
{
for(j=1;j<=len2;j++)
{
if(str1[i-1]==str2[j-1])
{
LCS[i][j]=1+LCS[i-1][j-1];
b[i][j]='c';
}
else if(LCS[i-1][j]>=LCS[i][j-1])
{
LCS[i][j]=LCS[i-1][j];
b[i][j]='u';
}
else
{
LCS[i][j]=LCS[i][j-1];
b[i][j]='l';
}
}
}
Arrays in C and C++ start at 0, so the maximum offset you're interested in is probably strlen - 1. Try changing your for loops to
for(i=1;i<len1;i++)
{
for(j=1;j<len2;j++)
{
...
}
}
I am trying to implement mouse interfecing but somethings wrong with the input function.It should tell me that wheater i have made a left click or a right click but its not printing anything.Have a look:
#include<graphics.h>
#include<dos.h>
union REGS in,out;
void Graphics(void);
void DetectMouse(void);
void ShowMouse(void);
void HideMouse(void);
void InputMouse(void);
int main()
{
Graphics();
DetectMouse();
ShowMouse();
// HideMouse();
InputMouse();
getch();
closegraph();
return 0;
}
void Graphics(void)
{
int driver=DETECT,mode;
initgraph(&driver,&mode,"C:\\TC\\bgi");
outtextxy(1,1,"Graphics mode activated!");
}
void DetectMouse(void)
{
int result;
in.x.ax=0;
result=int86(0x33,&in,&out);
if(result)
{
outtextxy(10,10,"Driver succesfully detected");
}
else
{
outtextxy(10,10,"Driver not detected");
}
}
void ShowMouse(void)
{
in.x.ax=1;
int86(0x33,&in,&out);
}
void HideMouse(void)
{
in.x.ax=2;
int86(0x33,&in,&out);
}
void InputMouse(void)
{
for(;kbhit();)
{
int x,y;
in.x.ax=3;
int86(0x33,&in,&out);
if(out.x.bx==1)
outtextxy(30,30,"Left click");
if(out.x.bx==2)
outtextxy(40,40,"Right click");
if(out.x.bx==3)
outtextxy(50,50,"Middle click");
delay(100);
}
}
Try if((out.x.bx & 1) != 0) ... - i.e. check just bit 0 - I note that many of the flags are 'unused' for INT33 AX=3 - whether this guarantees them zero or not is anyone's guess.
You probably want to have a main loop. INT 33 AX=0003 doesn't block waiting for mouse input.