Variable Declaration And Scope
8 Questions
| Total Attempts: 108
Questions and Answers
- 1.Consider the following two C linesint 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
- 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
- D.
Option 4
- 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
- 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
- 5.Output?int main() { { int var = 10; } { printf("%d", var); } return 0; }
- A.
10
- B.
Compiler Error
- C.
Garbage value
- 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
- 7.Int main() { int x = 032; printf("%d", x); return 0; }
- A.
32
- B.
0
- C.
26
- D.
50
- 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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