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  • Question
  • 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

  • Correct Answer
  • Result = -100.000000 

    Explanation
    The macro function SQUARE(x) x*x calculate the square of the given number 'x'. (Eg: 102)

    Step 1: float s=10, u=30, t=2, a; Here the variable s, u, t, a are declared as an floating point type and the variable s, u, t are initialized to 10, 30, 2.

    Step 2: a = 2*(s-u*t)/SQUARE(t); becomes,

    => a = 2 * (10 - 30 * 2) / t * t; Here SQUARE(t) is replaced by macro to t*t .

    => a = 2 * (10 - 30 * 2) / 2 * 2;

    => a = 2 * (10 - 60) / 2 * 2;

    => a = 2 * (-50) / 2 * 2 ;

    => a = 2 * (-25) * 2 ;

    => a = (-50) * 2 ;

    => a = -100;

    Step 3: printf("Result=%f", a); It prints the value of variable 'a'.

    Hence the output of the program is -100


    More questions

    • 1. What will be the output of the program?
      #include<stdio.h>
      int X=40;
      int main()
      {
          int X=20;
          printf("%d\n", X);
          return 0;
      }
      

    • Options
    • A. 20
    • B. 40
    • C. Error
    • D. No Output
    • Discuss
    • 2. What will be the output of the program (myprog.c) given below if it is executed from the command line?
      cmd> myprog one two three
      /* myprog.c */
      #include<stdio.h>
      #include<stdlib.h>
      
      int main(int argc, char **argv)
      {
          int i;
          for(i=1; i<=3; i++)
              printf("%u\n", &argv[i]);
          return 0;
      }
      
      If the first value printed by the above program is 65517, what will be the rest of output?


    • Options
    • A. 65525 65531
    • B. 65519 65521
    • C. 65517 65517
    • D. 65521 65525
    • Discuss
    • 3. What will be the output of the program?
      #include<stdio.h>
      #include<stdlib.h>
      
      int main()
      {
          int *p;
          p = (int *)malloc(20); /* Assume p has address of 1314 */
          free(p);
          printf("%u", p);
          return 0;
      }
      

    • Options
    • A. 1314
    • B. Garbage value
    • C. 1316
    • D. Random address
    • Discuss
    • 4. Size of short integer and long integer would vary from one platform to another.

    • Options
    • A. True
    • B. False
    • Discuss
    • 5. Names of functions in two different files linked together must be unique

    • Options
    • A. True
    • B. False
    • Discuss
    • 6. What will be the output of the program?
      #include<stdio.h>
      
      int main()
      {
          int arr[2][2][2] = {10, 2, 3, 4, 5, 6, 7, 8};
          int *p, *q;
          p = &arr[1][1][1];
          q = (int*) arr;
          printf("%d, %d\n", *p, *q);
          return 0;
      }
      

    • Options
    • A. 8, 10
    • B. 10, 2
    • C. 8, 1
    • D. Garbage values
    • Discuss
    • 7. The macro va_arg is used to extract an argument from the variable argument list and advance the pointer to the next argument.

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. What will be the output of the program in Turbo C?
      #include<stdio.h>
      
      int main()
      {
          char near *near *ptr1;
          char near *far *ptr2;
          char near *huge *ptr3;
          printf("%d, %d, %d\n", sizeof(ptr1), sizeof(ptr2), sizeof(ptr3));
          return 0;
      }
      

    • Options
    • A. 4, 4, 8
    • B. 4, 4, 4
    • C. 2, 4, 8
    • D. 2, 4, 4
    • Discuss
    • 9. What will be the output of the program (sample.c) given below if it is executed from the command line?
      cmd> sample 1 2 3
      cmd> sample 2 2 3
      cmd> sample 3 2 3
      /* sample.c */
      #include<stdio.h>
      
      int main(int argc, char *argv[])
      {
          printf("%s\n", argv[0]);
          return 0;
      }
      

    • Options
    • A. sample 3 2 3
    • B. sample 1 2 3
    • C. sample
    • D. Error
    • Discuss
    • 10. It is necessary to call the macro va_end if va_start is called in the function.

    • Options
    • A. Yes
    • B. No
    • Discuss


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