#include <stdio.h>

int	main(){
		int    invalid_op = 0;
		char   op;
		float  number1, number2, result;

		printf("Enter two numbers and an operator in the format\n");
		printf(" number1 operator number2\n");
		scanf("%f %c %f", &number1, &op, &number2);

		if(op == '*')
			result = number1 * number2;
		else if(op == '/')
			result = number1 / number2;
		else if(op == '+')
			result = number1 + number2;
		else if(op == '-')
			result = number1 - number2;
		else
			invalid_op = 1;

		if( invalid_op != 1 )
			printf("%f %c %f is %f\n", number1, op, number2, result );
		else
			printf("Invalid operator.\n");
			
   int pause;
   scanf("%d",&pause);			
   return 0;			
}