what is wrong here???

[Unregistered]

in my assigment i have to use pointers but it doesnt work

#include <stdio.h>
#include <conio.h>

int a[5][5],*p;

void init(int *p) { //error
int i,j;
for(i=0;i<5;i++)
for(j=0;j<5;j++)
*(p+(i*5+j))=j;
}
void load(int *p) { // error
int i,j;
for(i=0;i<5;i++)
for(j=0;j<5;j++)
*(p+(i*5+j))+=i+1;
}

void print(int *p) { // error
int i,j;
for(i=0;i<5;i++) {
for(j=0;j<i;j++)
printf("%d",*(p+(i*5+j)));
printf("\n");
}
}
void main() {
int i,j;
clrscr();
p=&a[0][0];
init(&p); //error
load(&p); //error
print(&p); //error
getch();
}

how can i fix this??

[Magos]

Originally posted by Unregistered
in my assigment i have to use pointers but it doesnt work

#include <stdio.h>
#include <conio.h>

int a[5][5],*p;

void init(int *p) { //error
int i,j;
for(i=0;i<5;i++)
for(j=0;j<5;j++)
*(p+(i*5+j))=j;
}
void load(int *p) { // error
int i,j;
for(i=0;i<5;i++)
for(j=0;j<5;j++)
*(p+(i*5+j))+=i+1;
}

void print(int *p) { // error
int i,j;
for(i=0;i<5;i++) {
for(j=0;j<i;j++)
printf("%d",*(p+(i*5+j)));
printf("\n");
}
}
void main() {
int i,j;
clrscr();
p=&a[0][0];
init(&p); //error
load(&p); //error
print(&p); //error
getch();
}

how can i fix this??

1) Can you please tell us what errors you get?
2) void main() is bad style... use int main()
3) Why do you have i and j in the main function?
4) p is a pointer, so when you use &p as a parameter you send the adress of the pointer itself, not what it's pointing at.
5) Please use code tags next time

[QuestionC]

int main() { 
 int i,j; 
 clrscr(); 
 p=&a[0][0]; 
 init(p);
 load(p);
 print(p);
 getch(); 
}

or...

int main() { 
 int i,j; 
 clrscr(); 
 init(&a[0][0]);
 load(&a[0][0]);
 print(&a[0][0]);
 getch(); 
}

[Hammer]

p = a[0];
init(p);	
load(p);	
print(p);

It compiles and runs if you do this, but without looking deeper into what your functions are doing (no time at present), I'm not sure if it's safe or not.

[Magos]

p = a[0]; <--> p = &a[0][0];

Since arrays are basically a pointer.

[Salem]

You'd better read this
http://www.cprogramming.com/cboard/s...threadid=17742
To see why int **a is not the same as int a[10][10];

Is this a deliberate exercise in squashing 2D arrays into hand-subscripted 1D arrays

Or because you haven't figured out the syntax for higher dimensions?