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  • Question
  • What will be the output of the program?
    #include<stdio.h>
    #define PRINT(i) printf("%d,",i)
    
    int main()
    {
        int x=2, y=3, z=4;
        PRINT(x);
        PRINT(y);
        PRINT(z);
        return 0;
    }
    


  • Options
  • A. 2, 3, 4,
  • B. 2, 2, 2,
  • C. 3, 3, 3,
  • D. 4, 4, 4,

  • Correct Answer
  • 2, 3, 4, 

    Explanation
    The macro PRINT(i) print("%d,", i); prints the given variable value in an integer format.

    Step 1: int x=2, y=3, z=4; The variable x, y, z are declared as an integer type and initialized to 2, 3, 4 respectively.

    Step 2: PRINT(x); becomes printf("%d,",x). Hence it prints '2'.

    Step 3: PRINT(y); becomes printf("%d,",y). Hence it prints '3'.

    Step 4: PRINT(z); becomes printf("%d,",z). Hence it prints '4'.

    Hence the output of the program is 2, 3, 4.


    C Preprocessor problems


    Search Results


    • 1. What will be the output of the program?
      #include<stdio.h>
      #define MIN(x, y) (x<y)? x : y;
      int main()
      {
          int x=3, y=4, z;
          z = MIN(x+y/2, y-1);
          if(z > 0)
              printf("%d\n", z);
          return 0;
      }
      

    • Options
    • A. 3
    • B. 4
    • C. 0
    • D. No output
    • Discuss
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. What will be the output of the program?
      #include<stdio.h>
      #define FUN(i, j) i##j
      
      int main()
      {
          int va1=10;
          int va12=20;
          printf("%d\n", FUN(va1, 2));
          return 0;
      }
      

    • Options
    • A. 10
    • B. 20
    • C. 1020
    • D. 12
    • Discuss
    • 7. What will be the output of the program?
      #include<stdio.h>
      #define MAN(x, y) ((x)>(y))? (x):(y);
      
      int main()
      {
          int i=10, j=5, k=0;
          k = MAN(++i, j++);
          printf("%d, %d, %d\n", i, j, k);
          return 0;
      }
      

    • Options
    • A. 12, 6, 12
    • B. 11, 5, 11
    • C. 11, 5, Garbage
    • D. 12, 6, Garbage
    • Discuss
    • 8. What will be the output of the program?
      #include<stdio.h>
      #define MAX(a, b, c) (a>b? a>c? a : c: b>c? b : c)
      
      int main()
      {
          int x;
          x = MAX(3+2, 2+7, 3+7);
          printf("%d\n", x);
          return 0;
      }
      

    • Options
    • A. 5
    • B. 9
    • C. 10
    • D. 3+7
    • Discuss
    • 9. The preprocessor can trap simple errors like missing declarations, nested comments or mismatch of braces.

    • Options
    • A. True
    • B. False
    • Discuss
    • 10. A preprocessor directive is a message from programmer to the preprocessor.

    • Options
    • A. True
    • B. False
    • Discuss


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