Consider the following two C lines C int var1 ; extern int var2 ; Which of the following statements is correct

First statement declares and defines var1, but second statement only declares var2

Both statements only declare variables, don\'t define them.

Both statements declare define variables var1 and var2

Find out the correct statement for the following program. C #include \"stdio.h\" int * gPtr ; int main () { int * lPtr = NULL ; if ( gPtr == lPtr ) { printf ( \ "Equal! \" ); } else { printf ( \ "Not Equal \" ); } return 0 ; }

It’ll always print Not Equal.

Since gPtr isn’t initialized in the program, it’ll print sometimes Equal and at other times Not Equal.

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C Variable Declaration and Scope

Question 1

Consider the following two C lines

int var1;
extern int var2;

Which of the following statements is correct

Both statements only declare variables, don\'t define them.
First statement declares and defines var1, but second statement only declares var2
Both statements declare define variables var1 and var2

Discuss it

Question 2

Predict the output

#include <stdio.h>
int var = 20;
int main()
{
    int var = var;
    printf(\"%d \", var);
    return 0;
}

Garbage Value
20
Compiler Error

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Question 3

#include <stdio.h>
extern int var;
int main()
{
    var = 10;
    printf(\"%d \", var);
    return 0;
}

Compiler Error: var is not defined
20
0

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Question 4

#include <stdio.h>
extern int var = 0;
int main()
{
    var = 10;
    printf(\"%d \", var);
    return 0;
}

10
Compiler Error: var is not defined
0

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Question 5

Output?

int main()
{
  {
      int var = 10;
  }
  {
      printf(\"%d\", var);  
  }
  return 0;
}

10
Compiler Error
Garbage Value

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Question 6

Output?

#include <stdio.h>
int main()
{
  int x = 1, y = 2, z = 3;
  printf(\" x = %d, y = %d, z = %d \\n\", x, y, z);
  {
       int x = 10;
       float y = 20;
       printf(\" x = %d, y = %f, z = %d \\n\", x, y, z);
       {
             int z = 100;
             printf(\" x = %d, y = %f, z = %d \\n\", x, y, z);
       }
  }
  return 0;
}

 x = 1, y = 2, z = 3
 x = 10, y = 20.000000, z = 3
 x = 1, y = 2, z = 100

Compiler Error

 x = 1, y = 2, z = 3
 x = 10, y = 20.000000, z = 3
 x = 10, y = 20.000000, z = 100

 x = 1, y = 2, z = 3
 x = 1, y = 2, z = 3
 x = 1, y = 2, z = 3

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Question 7

int main()
{
  int x = 032;
  printf(\"%d\", x);
  return 0;
}

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Question 8

Consider the following C program, which variable has the longest scope?

int a;
int main()
{
   int b;
   // ..
   // ..
}
int c;

a
b
c
All have same scope

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Question 9

Consider the following variable declarations and definitions in C

i) int var_9 = 1;
ii) int 9_var = 2;
iii) int _ = 3;

Choose the correct statement w.r.t. above variables.

Both i) and iii) are valid.
Only i) is valid.
Both i) and ii) are valid.
All are valid.

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Question 10

Find out the correct statement for the following program.

#include \"stdio.h\"

int * gPtr;

int main()
{
 int * lPtr = NULL;

 if(gPtr == lPtr)
 {
   printf(\"Equal!\");
 }
 else
 {
  printf(\"Not Equal\");
 }

 return 0;
}

It’ll always print Equal.
It’ll always print Not Equal.
Since gPtr isn’t initialized in the program, it’ll print sometimes Equal and at other times Not Equal.

Discuss it

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There are 17 questions to complete.

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