C Programming Multiple Choice Question - Variables And Datatypes

This section focuses on the "Variables And Datatypes" of the C programming. These Multiple Choice Questions (mcq) should be practiced to improve the C programming skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. How many keywords are there in c ?

A. 31
B. 32
C. 64
D. 63

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2. Which of the following is true for variable names in C?

A. Variable names cannot start with a digit
B. Variable can be of any length
C. They can contain alphanumeric characters as well as special characters
D. Reserved Word can be used as variable name

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3. Which of the following cannot be a variable name in C?

A. TRUE
B. friend
C. export
D. volatile

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4. What is the output of this program?

        
void main()
{
int x = 10;
float x = 10;
printf("%d", x)
}

A. Compilations Error
B. 10
C. 10
D. 10.1

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5. What is the output of this program?

    #include <stdio.h>
    int main()
    {
        int i;
        for (i = 0;i < 5; i++)
        int a = i;
        printf("%d", a);
    }

A. Syntax error in declaration of a
B. No errors, program will show the output 5
C. Redeclaration of a in same scope throws error
D. a is out of scope when printf is called

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6. What is the output of this program?

  #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. None of these

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7. What is the output of this program?

		 
void main()
{
      int p, q, r, s;
      p = 1;
      q = 2;
      r = p, q;
      s = (p, q);
      printf("p=%d q=%d", p, q);
}

A. p=1 q=1
B. p=1 q=2
C. p=2 q=2
D. Invalid Syntex

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8. What is the output of this program?

void main()
{
   printf("%x",-1<<4);
}

A. fff0
B. fff1
C. fff2
D. fff3

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9. What is the output of this program?

#include <stdio.h>
void main()
{
   int a=1, b=2, c=3, d;
   d = (a=c, b+=a, c=a+b+c);
   printf("%d %d %d %d", d, a, b, c);
}

A. 11 3 5 11
B. 11 1 5 11
C. 11 3 2 11
D. 11 3 3 11

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10. What is the output of this program?

void main()
{
   int a, b = 5, c;
   a = 5 * (b++);
   c = 5 * (++b);
   printf("%d %d",a,c);
}

A. 30 35
B. 30 30
C. 25 30
D. 25 35

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