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PC World Interactive 7
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MACRO.C
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1994-05-15
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/* Chapter 6 - Program 2 - MACRO.C */
#include "stdio.h"
#define WRONG(A) A*A*A /* Wrong macro for cube */
#define CUBE(A) (A)*(A)*(A) /* Right macro for cube */
#define SQUR(A) (A)*(A) /* Right macro for square */
#define ADD_WRONG(A) (A)+(A) /* Wrong macro for addition */
#define ADD_RIGHT(A) ((A)+(A)) /* Right macro for addition */
#define START 1
#define STOP 7
void main()
{
int i, offset;
offset = 5;
for (i = START ; i <= STOP ; i++) {
printf("The square of %3d is %4d, and its cube is %6d\n",
i+offset, SQUR(i+offset), CUBE(i+offset));
printf("The wrong of %3d is %6d\n",
i+offset, WRONG(i+offset));
}
printf("\nNow try the addition macro's\n");
for (i = START ; i <= STOP ; i++) {
printf("Wrong addition macro = %6d, and right = %6d\n",
5*ADD_WRONG(i), 5*ADD_RIGHT(i));
}
}
/* Result of execution
The square of 6 is 36, and its cube is 216
The wrong of 6 is 16
The square of 7 is 49, and its cube is 343
The wrong of 7 is 27
The square of 8 is 64, and its cube is 512
The wrong of 8 is 38
The square of 9 is 81, and its cube is 729
The wrong of 9 is 49
The square of 10 is 100, and its cube is 1000
The wrong of 10 is 60
The square of 11 is 121, and its cube is 1331
The wrong of 11 is 71
The square of 12 is 144, and its cube is 1728
The wrong of 12 is 82
Now try the addition macro's
Wrong addition macro = 6, and right = 10
Wrong addition macro = 12, and right = 20
Wrong addition macro = 18, and right = 30
Wrong addition macro = 24, and right = 40
Wrong addition macro = 30, and right = 50
Wrong addition macro = 36, and right = 60
Wrong addition macro = 42, and right = 70
*/