C Programming MCQ - Variables & Datatypes

31. What is the output of this program?

int main()
{
char ch;
ch = 128;
printf("%d", ch);
return 0;
}

A. 128
B. -128
C. Depends on compiler
D. None of the above

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32. What is the output of this program?

int main()
{
float x = 'a';
printf("%f", x);
return 0;
}

A. a
B. 0.000000
C. 97.000000
D. Run time error

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33. How would you round off a value from 6.66 to 7.0?

A. ceil(6.66)
B. floor(6.66)
C. roundup(6.66)
D. roundto(6.66)

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34. What will be the output of the program in 16 bit platform ?

#include <stdio.h>
int main()
{
    extern int i;
    i = 20;
    printf("%d", sizeof(i));
    return 0;
}

A. 2
B. 4
C. 8
D. Linker Error

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

#include <stdio.h>
int main()
{
    printf("%d	",sizeof(5.5));
    printf("%d	",sizeof(50000));
    printf("%d",sizeof('A')); 
    return 0;
  }

A. 4 2 1
B. 8 4 4
C. 8 4 2
D. compiler dependent

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36. What is the output of this program?

void main()
{
      int i=0, j=1, k=2, m;
      m = i++ || j++ || k++;
      printf("%d %d %d %d", m, i, j, k);
}

A. 1 1 2 3
B. 1 1 2 2
C. 0 1 2 2
D. 0 1 2 3

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37. What is the output of this program?

        
void main()
{
      int c = - -14; 
      printf("%d", c); 
}

A. 13
B. 14
C. -14
D. Compilation Error

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38. What is the output of this program?

void main()
{ 
      int i=5; 
      i = !i>10; 
      printf("%d", i); 
}

A. 5
B. 10
C. 0
D. None of the above

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39. The format identifier %i is also used for _____ data type?

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

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40. Variable names beginning with underscore is not encouraged. Why?

A. It is not standardized
B. To avoid conflicts since assemblers and loaders use such names
C. To avoid conflicts since library routines use such names
D. To avoid conflicts with environment variables of an operating system

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