WB JECA MCA C Programming Language Previous Year Question Paper and Solution with PDF

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WB JECA MCA Previous Year Questions (PYQs)

WB JECA MCA C Programming Language PYQ

Qus : 1 WB JECA MCA PYQ

What will be output of the following code snippet?

#include int main()

{

float x = 5;

if(x > 10)

printf("Greater");

else if(x = 10)

printf("Equal");

else

printf("Smaller");

return 0;

}

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

Assignment x=10 makes condition true → prints "Equal".

Qus : 2 WB JECA MCA PYQ

What will be output of the following code snippet?

#include int main()

{

int i;

for (i=1;i<=5;i++)

{

if(i == i)

continue;

printf("%d ", i);

}

return 0;

}

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

Condition i==i always true → continue always → nothing printed.

Qus : 3 WB JECA MCA PYQ

Which of the following statements about arrays in C is correct?

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

Array name gives base address; indexing starts from 0.

Qus : 4 WB JECA MCA PYQ

Read the following statements about functions in C and choose the correct option:

(i) A function in C can return only one value directly.

(ii) Function names can be the same as variable names in the same scope.

(iii) A function must always take at least one argument.

(iv) Recursion is allowed in C functions.

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Solution

(i) true, (ii) false, (iii) false, (iv) true.

Qus : 5 WB JECA MCA PYQ

What happens when a recursive function in C lacks a proper base condition?

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

No base condition → infinite recursion → stack overflow.

Qus : 6 WB JECA MCA PYQ

What will be the output of the following C code?

#include int main()

{

int a = 10;

int *p = &a;

printf("%d ", *p);

return 0;

}

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

*p gives value stored at address of a → 10.

Qus : 7 WB JECA MCA PYQ

Which of the following statements about structures and unions in C is true?

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Solution

Union size = size of largest member; structure uses separate memory with padding.

Qus : 8 WB JECA MCA PYQ

What will be the output of the following program?

#include int main()

{

char str1[20] = "Hello ";

char str2[20] = "Hello";

strcpy(str2, str1);

if (strcmp(str1, str2) == 0)

printf("Equal ");

else

printf("Not Equal ");

return 0;

}

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Solution

After strcpy, both strings are same → strcmp returns 0 → Equal.

Qus : 9 WB JECA MCA PYQ

What is the range of unsigned int in C?

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Solution

Unsigned int (16-bit) ranges from 0 to 2^16 - 1 = 65535.

Qus : 10 WB JECA MCA PYQ

What will be the output of the following C program?

#include int recur(int n)

{

if(n == 0)

return 0;

else

return n + recur(n - 1); }

int main()

{

int result = recur(4);

printf("%d ", result);

return 0;

}

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Solution

recur(4)=4+3+2+1=10.

Qus : 11 WB JECA MCA PYQ

What will be the output of the following C code?

#include int main()

{

int x;

x = 4<3?100:3==3?2?50:75;

printf("%d", x);

return 0;

}

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2025 PYQ

Solution

4<3 false → evaluate next → 3==3 true → 2?50:75 → 50.

Qus : 12 WB JECA MCA PYQ

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) $Z$

(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)

Qus : 13 WB JECA MCA PYQ

What is the output of the following C-program?

#include

int main() {

const int a=10;

printf("%d", +a);

return 0;

}

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Solution

The constant a=10. Unary +a does not increment, it only returns the same value.
So, output = 10.
Answer = (B) 10

Qus : 14 WB JECA MCA PYQ

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 ls -a.
Answer = (C) ls -a

Qus : 15 WB JECA MCA PYQ

Which C keyword is used to extend the visibility of variables?

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Solution

The extern keyword is used in C to extend variable visibility across multiple files.
Answer (C) extern

Qus : 16 WB JECA MCA PYQ

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

Qus : 17 WB JECA MCA PYQ

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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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

Solution: x *= x + y means x = x * (x + y) ⇒ 2 * (2 + 1) = 6.
Answer: (D) 6

Qus : 18 WB JECA MCA PYQ

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: 5>8 is false ⇒ evaluate 1 != 2 < 5 ? 20 : 30.
Relational before != : 2<5 ⇒ 1. Then 1 != 1 ⇒ false ⇒ choose 30.
Answer: (D) 30

Qus : 19 WB JECA MCA PYQ

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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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

Solution: First 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

Qus : 20 WB JECA MCA PYQ

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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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

Solution: The snippet shown misses a declaration of y (outside initialization), so it will not compile. Hence, it gives a compilation error.
Answer: (D) compile error

Qus : 21 WB JECA MCA PYQ

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

Qus : 22 WB JECA MCA PYQ

What is the output of the following code snippet? int main(){ int i,k=5; if(i=k){ printf("YES"); } else { printf("NO"); } }

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2024 PYQ

Solution

Solution: if(i=k) assigns 5 to i ⇒ condition true ⇒ executes if-block ⇒ prints "YES".
Answer: (B) YES

Qus : 23 WB JECA MCA PYQ

What is the output of the following program ?

#include void main ( )

{

int a = 40; float b;

b = ++a;

printf(“%d, %f ”, a, ++b);

}

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

Qus : 24 WB JECA MCA PYQ

What is the output of the following C program?

#include <stdio.h>
void main(){
  int a = -7;
  float b;
  b = a++;
  printf("%d, %f ", a, ++b);
}

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Solution

Explanation: The statement b = a++; assigns the current value of a (−7) to b and then increments a to −6. Later, ++b increments b from −7 to −6 before printing. $$ a = -6,\quad b = -6.000000 $$

Qus : 25 WB JECA MCA PYQ

What is the output?

#include <stdio.h>
void main(){
  int i = -1;
  printf("sizeof(i) = %d", sizeof(i));
}

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Solution

Explanation: The operator sizeof gives the size of the type in bytes, not the value. On most 32-bit and 64-bit systems, sizeof(int) is 4. $$ \text{Output: } \texttt{sizeof(i) = 4} $$

Qus : 26 WB JECA MCA PYQ

What is the output?

#include <stdio.h>
void main(){
  int x = -1, y = 1, z = 0;
  if(x && y++ && z)
    ++x, y++, --z;
  printf("%d, %d, %d", x++, y++, z++);
}

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

Explanation: In the condition x && y++ && z, since z = 0, the logical AND short-circuits and the body of the if is not executed. However, y++ is evaluated before the short-circuit, so y becomes 2. Values before printing: $$ x = -1,\ y = 2,\ z = 0 $$ So the program prints: $$ (-1,\ 2,\ 0) $$

Qus : 27 WB JECA MCA PYQ

What is the output?

#include <stdio.h>
enum colors{RED, BROWN, ORANGE};
void main(){
  printf("%ld..%f..%d", RED, BROWN, ORANGE);
}

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

Explanation: The format specifiers do not match the data types (%f is used for int). This causes undefined behavior. The program may compile, but the output is not reliable. Correct choice: None of these.

Qus : 28 WB JECA MCA PYQ

What is the output?

#include <stdio.h>
void main(){
  char M = 'M';
  printf("%d, %c", M, M);
}

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

Explanation: The character 'M' has an ASCII value of 77. So printing with %d shows 77, and %c shows M. $$ \text{Output: } 77,\ M $$

Qus : 29 WB JECA MCA PYQ

What is the output?

#include <stdio.h>
void main(){
  int i = -9;
  printf("%d %d %d", i++, ++i, ++i);
}

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

Ek hi expression me variable i par multiple modifications → C standard me undefined behavior.
Isliye koi fixed output/compile error guarantee nahi. Sahi option: None of these.

Qus : 30 WB JECA MCA PYQ

What is the output?

#include <stdio.h>
void main(){
  int **ptr;
  int temp = 65;
  ptr[0] = &temp;
  printf("%d", ptr[0][0]);
}

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Solution

Explanation: The pointer ptr is uninitialized, so it does not point to valid memory. When the code tries to access ptr[0], it attempts to dereference an invalid location. This leads to undefined behavior, and in most cases results in a segmentation fault.

Qus : 31 WB JECA MCA PYQ

What is the output?

#include <stdio.h>
#include <stdlib.h>
void main(){
  int *ptr;
  ptr = (int*) calloc(3, sizeof(int));
  ptr[2] = 30;
  printf("%d", *ptr);
  free(ptr);
}

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

Explanation: The function calloc initializes all allocated memory blocks with zero. So ptr[0] is initialized to 0. The statement *ptr is equivalent to ptr[0]. $$ \text{Output: } 0 $$

Qus : 32 WB JECA MCA PYQ

25.What is the output of the following program ? include <iostream> using namespace std; int addition (int a, int b) { return a+b; } double addition (double a, double b) { return a+b; } int main () { cout<< addition (35,20) << “;”; cout<< addition (34.1,12.7); return 0; }

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

The given program defines two overloaded functions `addition`:

1. `int addition(int a, int b)` → returns integer sum

2. `double addition(double a, double b)` → returns double sum

In `main()`:

- `addition(35,20)` calls the integer version → 35 + 20 = 55

- `addition(34.1,12.7)` calls the double version → 34.1 + 12.7 = 46.8

Therefore, the output is:

55;46.8

Qus : 33 WB JECA MCA PYQ

26.What is the output of the following program ? #include <iostream> using namespace std; template <class C1, class C2> bool is_equal (C1 var1, C2 var2) { return (var1 = = var2); } int main () { if (is_equal(10,10.0)) cout<< “Equal”; else cout<< “Not equal”; return 0; }

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Solution

The function `is_equal` is a template that compares two variables of possibly different types.

In `main()`, we call `is_equal(10, 10.0)`.

- `10` is an integer (int).

- `10.0` is a double.

C++ allows implicit type conversion during comparison.

So, `10 == 10.0` evaluates to `true`.

Therefore, the condition in the `if` statement is true, and the output will be:

Equal

Qus : 34 WB JECA MCA PYQ

26.What is the output of the following program ?

#include <iostream>

using namespace std;

int main()

{

int var = 0;

while (var < 10)

{

cout << var << " ";

var++;

}

cout << var;

return 0;

}

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Solution

Output:

0 1 2 3 4 5 6 7 8 9 10

Explanation:

The variable var starts at 0.
The while (var < 10) loop prints 0 1 2 3 4 5 6 7 8 9 with spaces.
When var reaches 10, the loop stops.
After the loop, cout << var; prints 10.

Final output:
```
0 1 2 3 4 5 6 7 8 9 10
```

Qus : 35 WB JECA MCA PYQ

What is the output of the following program ?

#include <iostream>

using namespace std;

struct demo

{

int var;

};

int main()

{

demo str;

demo *ptr;

str.var = 100;

ptr = &str;

cout << ptr->var;

return 0;

}

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Solution

Output:

100

Explanation:

str.var = 100; assigns 100 to the structure variable.

ptr = &str; makes the pointer point to str.

ptr->var accesses the member var of structure str via pointer.

Hence it prints 100.

Qus : 36 WB JECA MCA PYQ

29.What is the output of the following program ?

#include <iostream>

using namespace std;

int main ()

{

int c1 = 10;

int c2 = 20;

{

int c1;

c1 = 50;

c2 = 50;

cout << "c1= " << c1 << ", c2=" << c2;

}

cout << ", c1= " << c1 << ", c2=" << c2;

return 0;

}

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Solution

Output:
c1= 50, c2=50, c1= 10, c2=50
Explanation:

Outer c1 = 10, c2 = 20.

Inside the inner block, a new local c1 is declared (shadowing outer c1).

Inner c1 = 50, and c2 (outer one) is updated to 50.

First cout prints → c1= 50, c2=50.

After the block ends, inner c1 is destroyed. Outer c1 remains 10, while outer c2 is 50.

Second cout prints → , c1= 10, c2=50.

? Final output: c1= 50, c2=50, c1= 10, c2=50.

Qus : 37 WB JECA MCA PYQ

30.What is the output of the following program ?

#include <iostream>

using namespace std;

class Demo {

public:

static int count;

Demo() { count++; }

};

int Demo::count = 0;

int main() {

Demo var1;

Demo var2[5];

cout << var1.count;

return 0;

}

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

Explanation:
- int Demo::count = 0; initializes the static variable count to 0.
- Demo var1; → constructor is called once → count = 1.
- Demo var2[5]; → constructor is called 5 times (for each element in the array) → count = 6.
- Since count is static, it is shared among all objects.
- Finally, cout << var1.count; prints 6.
? Correct answer: (A) 6 ✅

Qus : 38 WB JECA MCA PYQ

31.What is the output of the following program ?

#include <iostream>

using namespace std;

void print();

int main()

{

int var = 0;

var = print();

cout << var;

return 0;

}

void print()

{

cout << "Hi";

}

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Solution

Explanation:
- print() is declared as void print().
- In main(), the statement var = print(); tries to assign the return value of print() to an int variable.
- But since print() has no return value (void), this causes a compile-time error.
Hence, the program does not compile.

Qus : 39 WB JECA MCA PYQ

32.What is the output of the following program ?

#include <iostream>

using namespace std;

int main()

{

int var = 2;

{

cout << var;

} while (var--);

return 0;

}

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WB JECA MCA Previous Year PYQ WB JECA MCA JECA MCA 2023 PYQ

Solution

Explanation:
- Initially var = 2.
- First iteration: prints 2, then var-- makes var = 1.
- Second iteration: prints 1, then var-- makes var = 0.
- Third iteration: prints 0, then var-- makes var = -1. Condition fails and loop exits.
So output is:

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