Data Types in C Language - Quiz

Q: What is the size of an int data type in a 32-bit system?

A. 4 Bytes
B. 8 Bytes
C. 2 Bytes
D. Depends on the system/compiler

Correct Option: C
Remarks:

Explanation:

The size of an int data type in a 32-bit system is 2 Bytes

Q: What is the output of this C code?


#include <stdio.h>
int main()
 {
  signed char chr;
  chr = 200;
  printf("%d\n", chr);
  return 0;
 }

A. -56
B. 200
C. -200
D. Depends on the computer

Correct Option: A
Remarks:

Explanation:

Output:

-56

Q: What is the output of this C Program?


#include <stdio.h>
int main()
 {
  float f1 = 0.1;
  if (f1 == 0.1)
    printf("equal\n");
  else
    printf("not equal\n");
 }

A. not equal
B. equal
C. Output depends on compiler
D. None of the mentioned

Correct Option: A
Remarks:

Explanation:

Output

not equal

0.1 by default is of type double which has different representation than float resulting in inequality even after conversion.

Q: Which is correct with respect to the size of the datatypes?

A. char > int > float
B. int > char > float
C. char < int < double
D. double > char > int

Correct Option: C
Remarks:

Explanation:

char has lesser bytes than int and int has lesser bytes than double in any system

Option C is correct with respect to the size of the datatypes in the C programming language. The char data type typically has a size of 1 byte, the int data type typically has a size of 4 bytes, and the double data type typically has a size of 8 bytes. Therefore, char < int < double in terms of size. However, it's worth noting that the size of these data types can vary depending on the specific implementation and architecture of the system being used.

In C language, data types can be arranged based on their size in bytes. Here's a common arrangement from smallest to largest:

char: Typically 1 byte.
short: Usually 2 bytes.
int: Generally 4 bytes.
float: Usually 4 bytes.
long: Typically 4 bytes on 32-bit systems and 8 bytes on 64-bit systems.
double: Usually 8 bytes.
long long: Typically 8 bytes.
long double: Can vary, often 10 or 16 bytes.

Please note that the actual size of these data types might vary depending on the compiler and system architecture.

Q: What is the output of the following C code on a 64 bit machine?


#include <stdio.h>
union Sti
 {
  int nu;
  char m;
 };
  int main()
   {
    union Sti s;
    printf("%d", sizeof(s));
    return 0;
   }

A. 5
B. 4
C. 8
D. 9

Correct Option: B
Remarks:

Explanation:

Output:

Since the size of a union is the size of its maximum datatype, here int is the largest hence 4.

Q: Which of the datatypes have size that is variable?

A. Array
B. Structure
C. Union
D. All

Correct Option: D
Remarks:

Explanation:

Since the size of the structure depends on its fields, it has a variable size.

Q: Which of the following is not modifier of data type in c?

A. extern
B. interrupt
C. huge
D. All

Correct Option: D
Remarks:

Explanation:

All are not modifier. Also register is not a modifier.

Q:

What will be output when you will execute following c code?


#include<stdio.h>
   int main(){
    signed x,a;
    unsigned y,b;
    a=(signed)10u;
    b=(unsigned)-10;
    y = (signed)10u + (unsigned)-10;
    x = y;
    printf("%d  %u\t",a,b);
    if(x==y)
         printf("%d %d",x,y);
    else if(x!=y)
         printf("%u  %u",x,y);
    return 0;
}

A. 10 4294967286 0 0
B. 10 65526 0 0
C. A and B
D. None

Correct Option: C
Remarks:

Explanation:

Output of Turbo C++ 3.0: 10 65526 0 0

10 65526 0 0

Turbo C ++4.5: 10 65526 0 0

10 65526 0 0

Linux GCC: 10 4294967286 0 0

10 4294967286 0 0

Visual C++: 10 4294967286 0 0

10 4294967286 0 0

a=(signed)10u;

signed value of 10u is +10

so, a=10

b=(unsigned)-10;

unsigned value of -10 is :

MAX_VALUE_OF_UNSIGNED_INT – 10 + 1

In turbo c 3.0 complier max value of unsigned int is 65535

So, b = 65526

y = (signed)10u + (unsigned)-10;

= 10 + 65526 = 65536 = 0 (Since 65536 is beyond the range of unsigned int. zero is its corresponding cyclic vlaue)

X = y = 0

Q: What will be output when you will execute following c code?


#include<stdio.h>
int main(){
    volatile int x=34;
    printf("%d",x);
    return 0;
}

A. 34
B. Garbage
C. Compilation error
D. We cannot predict

Correct Option: D
Remarks:

Explanation:

We cannot predict the value of volatile variable because its value can be changed by any microprocessor interrupt.

Q: What would be the output of the following program?


#include<stdio.h> 

void main()
{
    int x = 40 ;
    {
    int x = 20 ;
    printf("\n%d ",x);
    }
    printf("%d ",x);
}

A. 40 20
B. 21 40
C. 20 40
D. 20 41

Correct Option: C
Remarks:

Explanation: Run in 64-bit machine
20 40 Press any key to continue . . .

Data Types in C Language - Quiz

What is the size of an int data type in a 32-bit system?

What is the output of this C code? #include <stdio.h> int main() { signed char chr; chr = 200; printf("%d\n", chr); return 0; }

What is the output of this C Program? #include <stdio.h> int main() { float f1 = 0.1; if (f1 == 0.1) printf("equal\n"); else printf("not equal\n"); }

Which is correct with respect to the size of the datatypes?

What is the output of the following C code on a 64 bit machine? #include <stdio.h> union Sti { int nu; char m; }; int main() { union Sti s; printf("%d", sizeof(s)); return 0; }

Which of the datatypes have size that is variable?

Which of the following is not modifier of data type in c?

What will be output when you will execute following c code? #include<stdio.h> int main(){ signed x,a; unsigned y,b; a=(signed)10u; b=(unsigned)-10; y = (signed)10u + (unsigned)-10; x = y; printf("%d %u\t",a,b); if(x==y) printf("%d %d",x,y); else if(x!=y) printf("%u %u",x,y); return 0; }

What will be output when you will execute following c code? #include<stdio.h> int main(){ volatile int x=34; printf("%d",x); return 0; }

What would be the output of the following program? #include<stdio.h> void main() { int x = 40 ; { int x = 20 ; printf("\n%d ",x); } printf("%d ",x); }

What is the output of this C code?

What is the output of this C Program?

What is the output of the following C code on a 64 bit machine?

What will be output when you will execute following c code?

What will be output when you will execute following c code?

What would be the output of the following program?