WB JECA MCA C Programming Language Previous Year Questions (PYQs) – Page 1 of 3
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What is the output of the following code snippet?
#include <stdio.h>
main() {
int x = 65, *p = &x;
void *q = p;
char *r = q;
printf("%c", *r);
}
(A) $A$
(B) $Z$
(C) $65$
(D) None of the above
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Solution
Step 1: Initialization
$x = 65$
In ASCII, $65 \equiv A$
Step 2: Pointer flow
$p = \&x \;\; \rightarrow$ pointer to integer
$q = p \;\; \rightarrow$ void pointer
$r = q \;\; \rightarrow$ typecast to char pointer
Step 3: Dereferencing
Since r is char*, it reads 1 byte.
The value stored = $65$
Step 4: Printing
printf("%c", *r); prints character with ASCII $65$.
Hence, the output is:
$\; \boxed{A} \;$
Correct Answer: (A)
What is the output of the following C-program?int main() { const int a=10; printf("%d", +a); return 0; }
#include
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Solution
The constant
So, output = 10.
Answer = (B) 10
a=10. Unary +a does not increment, it only returns the same value.So, output = 10.
Answer = (B) 10
How can you display a list of all files including the hidden files?
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Solution
In Linux/Unix, hidden files are shown using
Answer = (C) ls -a
ls -a.Answer = (C) ls -a
Which C keyword is used to extend the visibility of variables?
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Solution
The
Answer (C) extern
extern keyword is used in C to extend variable visibility across multiple files.Answer (C) extern
What is the output of the following C-program?\n#include\n#define CUBE(x) (x*x*x)\nint main() { int a, b=3; a = CUBE(b++); printf("%d, %d\n", a, b); return 0; }
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Solution
Solution:
- Macro expansion: CUBE(b++) → (b++ * b++ * b++).
- This causes multiple side effects → undefined behavior.
- Most compilers treat this as error/undefined.
Answer = (D) Error
- Macro expansion: CUBE(b++) → (b++ * b++ * b++).
- This causes multiple side effects → undefined behavior.
- Most compilers treat this as error/undefined.
Answer = (D) Error
What is the output of following C code? int main(){ int x=2, y=1; x *= x + y; printf("%d", x); }
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Solution
Solution:
Answer: (D) 6
x *= x + y means x = x * (x + y) ⇒ 2 * (2 + 1) = 6.Answer: (D) 6
What is the output of the following code snippet? #include int main(){ int x; x = 5 > 8 ? 10 : 1 != 2 < 5 ? 20 : 30; printf("%d", x); return 0; }
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Solution
Solution:
Relational before != :
Answer: (D) 30
5>8 is false ⇒ evaluate 1 != 2 < 5 ? 20 : 30.Relational before != :
2<5 ⇒ 1. Then 1 != 1 ⇒ false ⇒ choose 30.Answer: (D) 30
What will be the output of the C code? #include int main(){ int a=1; if(a--) printf("True"); if(a++) printf("False"); }
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Solution
Solution: First
Second
Answer: (A) True
if(a--) uses 1 (true) then decrements to 0 ⇒ prints "True".Second
if(a++) tests 0 (false) then increments to 1 ⇒ no print.Answer: (A) True
What is the output of the C-program? int main(){ int i=0; int x=i++; int y=++i; printf("%d %d", x,y); }
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Solution
Solution: The snippet shown misses a declaration of
Answer: (D) compile error
y (outside initialization),
so it will not compile. Hence, it gives a compilation error.Answer: (D) compile error
What is the output of the C-program? int main(){ int i=0; while(i=0) printf("True"); printf("False"); }
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Solution
Solution: while(i=0) assigns 0 ⇒ condition false ⇒ loop not executed. Prints "False".
Answer: (C) False
Answer: (C) False
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