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C Preprocessor - C Programming Questions and Answers

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C Programming :: C Preprocessor

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C Preprocessor - Point Out Correct Statements

  1. What will be the output of the program?

     #include
 #define SQUARE(x) x*x 

 int main() 
 {  
   float s=10, u=30, t=2, a;  
   a = 2*(s-u*t)/SQUARE(t);     
   printf("Result = %f", a);     
   return 0;
 }

    2. A.

    Result = -100.000000
    B.

    Result = -25.000000
    C.

    Result = 0.000000
    D.

    Result = 100.000000

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  2. What will be the output of the program?

      #include
  #define SQR(x)(x*x)
 
  int main() 
  {    
     int a, b=3;  
     a = SQR(b+2);  
     printf("%d\n", a);    
     return 0;
  }

    3. A.

    25
    B.

    11
    C.

    Error
    D.

    Garbage value

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  3. What will be the output of the program?

     #include
 #define JOIN(s1, s2) printf("%s=%s %s=%s \n", #s1, s1, #s2, s2);
 int main() 
 {   
    char *str1="Fresher";   
    char *str2="GATE";    
    JOIN(str1, str2);    
    return 0; 
}

     

    4. A.

    str1=FresherGATE str2=GATE
    B.

    str1=FresherGATE str2=GATE
    C.

    str1=Fresherstr2=FresherGATE
    D.

    Error: in macro substitution

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  4. What will be the output of the program?

      #include
  #define CUBE(x) (x*x*x)
 
  int main() 
  {   
     int a, b=3;   
     a = CUBE(b++);     
     printf("%d, %d\n", a, b);     
     return 0;
 }

    5. A.

    9, 4
    B.

    27, 4
    C.

    27, 6
    D.

    Error

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  5. What will be the output of the program?

     #include
 #define PRINT(int) printf("int=%d, ", int);

  int main()
  {     
     int x=2, y=3, z=4;        
     PRINT(x);  
     PRINT(y);  
     PRINT(z);  
     return 0; 
 }

    6. A.

    int=2, int=3, int=4
    B.

    int=2, int=2, int=2
    C.

    int=3, int=3, int=3
    D.

    int=4, int=4, int=4

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  6. What will be the output of the program?

     #include
 #define SWAP(a, b) int t; t=a, a=b, b=t; 
int main()
{   
    int a=10, b=12;  
    SWAP(a, b);   
    printf("a = %d, b = %d\n", a, b);     
    return 0; 
}

    7. A.

    a = 10, b = 12
    B.

    a = 12, b = 10
    C.

    Error: Declaration not allowed in macro
    D.

    Error: Undefined symbol 't'

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  7. What will be the output of the program?

     #include
 #define FUN(i, j) i##j 

 int main() 
 {   
     int va1=10;  
     int va12=20;    
     printf("%d\n", FUN(va1, 2));        
     return 0; }

     

    8. A.

    10
    B.

    20
    C.

    1020
    D.

    12

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  8. What will be the output of the program?

     #include
 #define FUN(arg) do\                    
                  {\                       
                    if(arg)\                         
        printf("FresherGATE...", "\n");\                
             }while(--i)  
 int main()
 {    
     int i=2;    
     FUN(i3);    
     return 0;
 }

    9. A.

    FresherGATE...
    FresherGATE...
    FresherGATE
    B.

    FresherGATE... FresherGATE...
    C.

    Error: cannot use control instructions in macro
    D.

    No output

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  9. What will be the output of the program?

     #include
 #define MAX(a, b) (a > b ? a : b)  

 int main() 
 {   
     int x;  
     x = MAX(3+2, 2+7);     
     printf("%d\n", x);  
     return 0; 
  }

    10. A.

    8
    B.

    9
    C.

    6
    D.

    5

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  10. What will be the output of the program?

     #include
 #define str(x) #x 
 #define Xstr(x) str(x)
 #define oper multiply 

 int main()
  {   
     char *opername = Xstr(oper);     
     printf("%s\n", opername);     
     return 0;
  }

    11. A.

    Error: in macro substitution
    B.

    Error: invalid reference 'x' in macro
    C.

    print 'multiply'
    D.

    No output

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