K & R C Programs Exercise 4-14.

K and R C, Solution to Exercise 4-14:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
Write C Program to swap two arguments using macros.
C Program to swap(t, x, y) that interchanges two arguments of type t using the block structure.

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#include <stdio.h>

#define swap(t, x, y)
do {
t safe ## x ## y;
safe ## x ## y = x;
x = y;
y = safe ## x ## y;
} while (0)

int main(void) {
int inum1, inum2;
double dnum1, dnum2;
char *ch1, *ch2;
printf("nEnter two Intgers:n");
printf("nIntegers before swap:n inum1= %dn inum2= %dn", inum1, inum2);
swap(int, inum1, inum2);
printf("nIntegers after swap:n inum1= %dn inum2= %dn", inum1, inum2);

printf("nEnter two Doubles:n");
printf("nDoubles before swap:n dnum1= %gn dnum2= %gn", dnum1, dnum2);
swap(double, dnum1, dnum2);
printf("nDoubles after swap:n dnum1= %gn dnum2= %gn", dnum1, dnum2);

printf("nEnter two Strings:n");
printf("n Strings before swap:n ch1= %sn ch2 = %sn", ch1, ch2);
swap(char *, ch1, ch2);
printf("nStrings after swap:n ch1= %sn ch2= %sn", ch1, ch2);

return 0;
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