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Practice questions on Pre-processor

Level 1

1.

What is a pre-processor?


2.

What is the difference between a macro and a function?


Level 2

1.

Write a macro to calculate area and perimeter of a rectangle.

#include <stdio.h>
#define area(l,b) (l*b)
#define perimeter(l,b) (2*(l+b))
int main()
{
  printf("Area is %d and perimeter is %d.\n",area(5,2),perimeter(5,2));
  return 0;
}

2.

Write a macro to compare two numbers.

#include <stdio.h>
#define equal(a,b) (a==b)
int main()
{
  printf("%d\n",equal(5,2));
  printf("%d\n",equal(5,5));
  return 0;
}
									

3.

Write a macro to find average of two numbers.

#include <stdio.h>
#define avg(a,b) ((a+b)/2.0)
int main()
{
  printf("%f\n",avg(5,2));
  return 0;
}

4.

Write a macro to find absolute value of a number.

#include <stdio.h>
#define abs(a) ((a<1)?(-1*a):a)
int main()
{
  printf("%d\n",abs(-5));
  printf("%d\n",abs(5));
  return 0;
}

5.

Write a macro to calculate simple interest from principal, rate of interest and time.
Simple interest = (principal*rate of interest*time)/100.

#include <stdio.h>
#define si(p,r,t) ((p*r*t)/100.0)
int main()
{
  printf("%f\n",si(1000,12,3));
  return 0;
}

Level 3

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