Variable Declaration and Scope

Question 1

Consider the following two C lines

int var1; extern int var2;

Which of the following statements is correct

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

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Question 2

Predict the output

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

A	Garbage Value
B	20
C	Compiler Error

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Question 3

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

A	Compiler Error: var is not defined
B	20
C	0

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Question 4

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

A	10
B	Compiler Error: var is not defined
C	0

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Question 5

Output?

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

A	10
B	Compiler Errror
C	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; }

A	x = 1, y = 2, z = 3 x = 10, y = 20.000000, z = 3 x = 1, y = 2, z = 100
B	Compiler Error
C	x = 1, y = 2, z = 3 x = 10, y = 20.000000, z = 3 x = 10, y = 20.000000, z = 100
D	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; }

A	32
B	0
C	26
D	50

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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	a
B	b
C	c
D	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.

A	Both i) and iii) are valid.
B	Only i) is valid.
C	Both i) and ii) are valid.
D	All are valid.

Variable Declaration and Scope    C Quiz - 101    
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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; }

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