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#include <stdio.h>
 
#define PI = 3.141592;
 
int main(void) {
 
	int a;
	int area, peri;
 
 
	area = PI * a*a;
	peri = PI *2 *a;
	printf("Enter the radius:\n ");
	scanf("%d", &a);
 
	printf("Area = %d\n", area);
	printf("Peri= %d\n", peri);
 
 
 
}
 

prog.c: In function 'main':
prog.c:3:12: error: expected expression before '=' token
 #define PI = 3.141592;
            ^
prog.c:11:9: note: in expansion of macro 'PI'
  area = PI * a*a;
         ^
prog.c:11:12: error: invalid type argument of unary '*' (have 'int')
  area = PI * a*a;
            ^
prog.c:3:12: error: expected expression before '=' token
 #define PI = 3.141592;
            ^
prog.c:12:9: note: in expansion of macro 'PI'
  peri = PI *2 *a;
         ^
prog.c:12:12: error: invalid type argument of unary '*' (have 'int')
  peri = PI *2 *a;
            ^

Standard output is empty