Answer:
the answer can be found HERE:
https://stackoverflow.com/a/13473767
put a leading space in the scanf(" %c", &op)
Explanation:
#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
main() {
double first, second;
char op;
while(1){
printf(" Calculator\n");
printf("\n 7 8 9 / \n 4 5 6 x \n 1 2 3 - \nEnter operator: ");
scanf(" %c", &op); //entering operators such as + - \ *
printf("Enter two operands:");
scanf("%lf %lf", &first, &second); //entering operands such as 1 2 5 8 12 414
switch (op) { // printing the math
case '+'://if its +
printf("%.1lf + %.1lf = %lf\n\n", first, second, first + second);
break;
case '-'://if its -
printf("%.1lf - %.1lf = %lf\n\n", first, second, first - second);
break;
case '*'://if its *
printf("%.1lf * %.1lf = %lf\n\n", first, second, first * second);
break;
case '/'://if its :
printf("%.1lf / %.1lf = %lf\n\n", first, second, first / second);
break;
default://if its not + - / *
printf("error!");
}
}
}
