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CuriousTab

CuriousTab

C Preprocessor problems


  • 1. What will be the output of the program?
    #include<stdio.h>
    #define SQR(x)(x*x)
    
    int main()
    {
        int a, b=3;
        a = SQR(b+2);
        printf("%d\n", a);
        return 0;
    }
    

  • Options
  • A. 25
  • B. 11
  • C. Error
  • D. Garbage value
  • Discuss
  • 2. What will be the output of the program?
    #include<stdio.h>
    #define MESS junk
    
    int main()
    {
        printf("MESS\n");
        return 0;
    }
    

  • Options
  • A. junk
  • B. MESS
  • C. Error
  • D. Nothing will print
  • Discuss
  • 3. What will be the output of the program?
    #include<stdio.h>
    #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;
    }
    

  • Options
  • A. Result = -100.000000
  • B. Result = -25.000000
  • C. Result = 0.000000
  • D. Result = 100.000000
  • Discuss
  • 4. What will be the output of the program?
    #include<stdio.h>
    #define CUBE(x) (x*x*x)
    
    int main()
    {
        int a, b=3;
        a = CUBE(b++);
        printf("%d, %d\n", a, b);
        return 0;
    }
    

  • Options
  • A. 9, 4
  • B. 27, 4
  • C. 27, 6
  • D. Error
  • Discuss
  • 5. What will be the output of the program?
    #include<stdio.h>
    #define PRINT(int) printf("int=%d, ", int);
    
    int main()
    {
        int x=2, y=3, z=4;   
        PRINT(x);
        PRINT(y);
        PRINT(z);
        return 0;
    }
    

  • Options
  • 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
  • Discuss
  • 6. What will be the output of the program?
    #include<stdio.h>
    #define JOIN(s1, s2) printf("%s=%s %s=%s \n", #s1, s1, #s2, s2);
    int main()
    {
        char *str1="India";
        char *str2="CURIOUSTAB";
        JOIN(str1, str2);
        return 0;
    }
    

  • Options
  • A. str1=CuriousTab str2=CURIOUSTAB
  • B. str1=India str2=CURIOUSTAB
  • C. str1=India str2=CuriousTab
  • D. Error: in macro substitution
  • Discuss
  • 7. What will be the output of the program?
    #include<stdio.h>
    #define FUN(arg) do\
                     {\
                        if(arg)\
                            printf("CuriousTab...", "\n");\
                      }while(--i)
    
    int main()
    {
        int i=2;
        FUN(i<3);
        return 0;
    }
    

  • Options
  • A. CuriousTab...
    CuriousTab...
    CuriousTab
  • B. CuriousTab... CuriousTab...
  • C. Error: cannot use control instructions in macro
  • D. No output
  • Discuss
  • 8. What will be the output of the program?
    #include<stdio.h>
    #define str(x) #x
    #define Xstr(x) str(x)
    #define oper multiply
    
    int main()
    {
        char *opername = Xstr(oper);
        printf("%s\n", opername);
        return 0;
    }
    

  • Options
  • A. Error: in macro substitution
  • B. Error: invalid reference 'x' in macro
  • C. print 'multiply'
  • D. No output
  • Discuss
  • 9. What will be the output of the program?
    #include<stdio.h>
    #define MAX(a, b) (a > b? a : b)
    
    int main()
    {
        int x;
        x = MAX(3+2, 2+7);
        printf("%d\n", x);
        return 0;
    }
    

  • Options
  • A. 8
  • B. 9
  • C. 6
  • D. 5
  • Discuss
  • 10. What will be the output of the program?
    #include<stdio.h>
    #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;
    }
    

  • Options
  • A. a = 10, b = 12
  • B. a = 12, b = 10
  • C. Error: Declaration not allowed in macro
  • D. Error: Undefined symbol 't'
  • Discuss

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