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#include <stdio.h>
 
void f(char *a, char *b) {
 
	int a;
	int x = *a;
	*a = *b;
	*b = x;
	printf("%c", *a);
	printf("%c", *b);
 
}
 
int main(void) {
	char *a;
	char *b;
	*a = 'a';
	*b = 'b';
	f(a,b);
	return 0;
}
 

prog.c: In function 'f':
prog.c:5:6: error: 'a' redeclared as different kind of symbol
  int a;
      ^
prog.c:3:14: note: previous definition of 'a' was here
 void f(char *a, char *b) {
              ^
prog.c:6:10: error: invalid type argument of unary '*' (have 'int')
  int x = *a;
          ^
prog.c:7:2: error: invalid type argument of unary '*' (have 'int')
  *a = *b;
  ^
prog.c:9:15: error: invalid type argument of unary '*' (have 'int')
  printf("%c", *a);
               ^

Standard output is empty