Introduction to Data Types in C - Quiz

Q: Which of the following is not a valid declaration in C?
1. short int x;

2. signed short x;

3. short x;

4. unsigned short x;

A. 1
B. 2
C. 3 and 4
D. All

Correct Option: D
Remarks:

Explanation:

All are valid

Q: What is the Output of this program?


#include <stdio.h>
int main()
{
   float c = 5.0;
   printf ("Temperature in Fahrenheit is %.2f", (9/5)*c + 32);
   return 0;
}

A. Temperature in Fahrenheit is 31.00
B. Temperature in Fahrenheit is 46.00
C. Temperature in Fahrenheit is 40.00
D. Temperature in Fahrenheit is 37.00

Correct Option: D
Remarks:

Explanation:

Temperature in Fahrenheit is 37.00

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: 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 will be output when you will execute following c code on a 64-bit machine?

 
#include<stdio.h>
int main(){
    int a= sizeof(signed) +sizeof(unsigned);
   printf("%d",a);
    return 0;
}

A. 10
B. 9
C. 8
D. Cannot find size of modifiers

Correct Option: C
Remarks:

Explanation:

Output:

Default data type of signed, unsigned is int. In 64-bit machine size of int is 4 byte.

signed=4

unsigned=4

Then, 4+4=8

Q:

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


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

A. 65536 -10
B. 0 65536
C. 0 0
D. Compilation error

Correct Option: C
Remarks:

Explanation:

Consider on the expression:

x = 10 +- 10u + 10u +- 10;

10: It is signed integer constant.

10u: It is unsigned integer constant.

X: It is signed integer variable.

In any binary operation of dissimilar data type for example: a + b

Lower data type operand always automatically type cast into the operand of higher data type before performing the operation and result will be higher data type.

As we know operators enjoy higher precedence than binary operators. So our expression is:

x = 10 + (-10u) + 10u + (-10);

= 10 + -10 + 10 + (-10);

= 0

Note: Signed is higher data type than unsigned int.

So, Corresponding signed value of unsigned 10u is +10

Q: Suppose a C program has floating constant 2.76, what's the best way to convert this as "float" data type?

A. (float)2.76
B. 2.76f or 2.76F
C. 2.76 itself of "float" data type i.e. nothing else required.
D. float(2.76)

Correct Option: B
Remarks:

Explanation:

By default floating constant is of a double data type. By suffixing it with f or F, it can be converted to float data type. For more details, this post can be referred here.

Q: What is the output of this program?


#include <stdio.h>
int main()
{
    if (sizeof(int) > -1)
        printf("Yes");
    else
        printf("No");
    return 0;
}

A. No
B. Yes
C. Compile time error
D. Run time Error

Correct Option: A
Remarks:

Explanation:

In C, when an integer value is compared with an unsigned it, the int is promoted to unsigned. Negative numbers are stored in 2's complement form and unsigned value of the 2's complement form is much higher than the sizeof int.

Q: Among the following which one is not a valid identifier?

A. Y12
B. Sum_1
C. _temperature
D. 4th

Correct Option: D
Remarks:

Explanation: 4th

Introduction to Data Types in C - Quiz

Which of the following is not a valid declaration in C? 1. short int x; 2. signed short x; 3. short x; 4. unsigned short x;

What is the Output of this program? #include <stdio.h> int main() { float c = 5.0; printf ("Temperature in Fahrenheit is %.2f", (9/5)*c + 32); return 0; }

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; }

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

What will be output when you will execute following c code on a 64-bit machine? #include<stdio.h> int main(){ int a= sizeof(signed) +sizeof(unsigned); printf("%d",a); return 0; }

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

Suppose a C program has floating constant 2.76, what's the best way to convert this as "float" data type?

What is the output of this program? #include <stdio.h> int main() { if (sizeof(int) > -1) printf("Yes"); else printf("No"); return 0; }

Among the following which one is not a valid identifier?

Which of the following is not a valid declaration in C?
1. short int x;

2. signed short x;

3. short x;

4. unsigned short x;

What is the Output of this program?

What is the output of this C code?

What will be output when you will execute following c code on a 64-bit machine?

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

What is the output of this program?