please any body give solution

[nkrao123@gmail.]

i am new to this forum. In c programing language i got one doubt regarind structures.

1.how can we define default values to structure members?
2. i compiled below program by seeing in one forum .its like

 struct s
{
int i,j;
s() :i(0),j(0){}
};
int main()
{
struct s s1;
printf("%d \n",s1.i);
printf("%d\n",s1.j);
return 0;
}

but i getting error while compiling the program.

how can we define our own values to structure by above programing

[Adak]

i am new to this forum. In c programing language i got one doubt regarind structures.

1.how can we define default values to structure members?
2. i compiled below program by seeing in one forum .its like

#include <stdio.h>

 struct s
{
  int i,j;
};
int main()
{
  struct s s1;

  do {
    pintf("Enter the integer value for i: ");
  }while((scanf("%d", &s1.i)) == 0);

  printf("Enter the integer value for j: ");
  scanf("%d", &s1.j);

  printf("%d \n",s1.i);
  printf("%d\n",s1.j);
  return 0;
}

but i getting error while compiling the program.

how can we define our own values to structure by above programing

Try that .

[nkrao123@gmail.]

Hi Adak,

Thanks for your reply.i executed your code. it is ok. i trying to assign some values to struct s at the time of defining(initialising) the structure .i trying to give values to i and j as 0,0 at the time of structure initialisation with the line

s():i(0),j(0){}.

is it possible to assing some values to variable of structure while initialing the structure?. if possible please explain me how can we do this

[Adak]

Hi Adak,

Thanks for your reply.i executed your code. it is ok. i trying to assign some values to struct s at the time of defining(initialising) the structure .i trying to give values to i and j as 0,0 at the time of structure initialisation with the line

s():i(0),j(0){}.

is it possible to assing some values to variable of structure while initialing the structure?. if possible please explain me how can we do this

Edit: Nope, no can do on my compiler. It makes sense that you can't, since at the time you define the struct, there is no instance of the struct yet that has been declared.

Maybe a different compiler.

[RockyMarrone]

#include <stdio.h>

struct structA {
  int a;
  int b;
  int c;

  structA() : a(0), b(0), c(0) {}
  structA(const int _a,
          const int _b,
          const int _c) : a(_a), b(_b), c(_c) {}
};

int main() {
  structA a1;
  printf("%d %d %d\n", a1.a, a1.b, a1.c);
  structA a2(1, 2, 3);
  printf("%d %d %d\n", a2.a, a2.b, a2.c);

  return 0;
}

by lookin at this i think u will remember class

[Adak]

Rocky, I've never seen that kind of a struct construction.

What's the story on that?

I get tons of errors, mostly:

structA() : a(0), b(0), c(0) {}  //a(0) "Requires constant expression"

and "Bit fields must contain at least 1..."

[RockyMarrone]

hey Adak
itz runnin on my system bro
and can u tell me whatz new strory here

[rakesh@buildsrv struct]$ cat test.cc
#include <stdio.h>

struct structA {
  int a;
  int b;
  int c;

  structA() : a(0), b(0), c(0) {}
  structA(const int _a,
          const int _b,
          const int _c) : a(_a), b(_b), c(_c) {}
};

int main() {
  structA a1;
  printf("%d %d %d\n", a1.a, a1.b, a1.c);
  structA a2(1, 2, 3);
  printf("%d %d %d\n", a2.a, a2.b, a2.c);

  return 0;
}
[rakesh@buildsrv struct]$ g++ test.cc
[rakesh@buildsrv struct]$ g++ -o test test.cc
[rakesh@buildsrv struct]$ ./test
0 0 0
1 2 3
[rakesh@buildsrv struct]$

Check this out from shell

[nkrao123@gmail.]

Hi ada,

i thinsk

struct s
{
int i=10;
int j=10;
};

we cant able decalare struct members . i executed the program by assigning like above. i getting errors.

[nkrao123@gmail.]

Hi Rocky,

i executed below program

#include<stdio.h>
struct s
{
int i;
int j;
s() :i(10),j(10){}
s(const int _i,const int _j):i(_i),j(j){}
};
int main()
{
struct s s1;
printf("%d %d \n",s1.i,s1.j);
return 0;
}

after compiling i getting error as " error: expected specifier-qualifier-list before âsâ "

i look for your further replys

[nkrao123@gmail.]

HI Rocky,

i am using RHEL5 OS. on wich OS u compiled ? i compiling but i getting error as " error: expected specifier-qualifier-list before âsâ"

can u let me know solution ?

i look for your further replys

[Adak]

He's using gcc under Linux, it seems.

The devil!

[RockyMarrone]

Fc 10 gcc 4.4.0

[RockyMarrone]

On Which OS u want i think u must specify that

[nkrao123@gmail.]

Hi Rocks,

u r right . i compiling on RHEL5 gcc 4.1.1 . in that i find strange problam . while i compiling my program struc.c as #cc struc.c and #gcc struc.c i getting error . but it i compile that same program as #g++ struc.c , its compiling . my stru.c program look likes below

struct s
{
int i;
int j;
s():i(10),j(10){}
};

int main()
{
struct s s1;
printf("%d\n",s1.i);
printf("%d\n",s1.j);
return 0;
}

output : 10
10


i didt give the code below also working
[code]
s(const int _i,const int _j):i(_i),j(j){}
[\code]

i think ,starting i done the mistake as i didt compiled with #g++ struc.c

can u let me know why my program is compiling with g++ onlly , why it didt compiling with cc and gcc and giving error as " error: expected specifier-qualifier-list before âsâ "

and why we cant able to initialise the variables in structures like

struct s
{
int i=10;
int j=20;
};


i look for your further replys

[laserlight]

nkrao123@gmail., is this a C or C++ program that you are trying to write? You appear to be trying to use a C++ constructor initialisation list, but you posted in the C programming forum and use I/O functions that are from the C standard library (although they are also available in the C++ standard library).