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  • Question
  • 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

  • Correct Answer
  • 10 

    Explanation
    The macro MAX(a, b, c) (a>b ? a>c ? a : c: b>c ? b : c) returns the biggest of given three numbers.

    Step 1: int x; The variable x is declared as an integer type.

    Step 2: x = MAX(3+2, 2+7, 3+7); becomes,

    => x = (3+2 >2+7 ? 3+2 > 3+7 ? 3+2 : 3+7: 2+7 > 3+7 ? 2+7 : 3+7)

    => x = (5 >9 ? (5 > 10 ? 5 : 10): (9 > 10 ? 9 : 10) )

    => x = (5 >9 ? (10): (10) )

    => x = 10

    Step 3: printf("%d\n", x); It prints the value of 'x'.

    Hence the output of the program is "10".


    C Preprocessor problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. 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,
    • Discuss
    • 4. 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
    • 5. 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
    • 6. The preprocessor can trap simple errors like missing declarations, nested comments or mismatch of braces.

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

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. Preprocessor directive #ifdef .. #else ... #endif is used for conditional compilation.

    • Options
    • A. True
    • B. False
    • Discuss
    • 9. Macro calls and function calls work exactly similarly.

    • Options
    • A. True
    • B. False
    • Discuss
    • 10. If the file to be included doesn't exist, the preprocessor flashes an error message.

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


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