Question

How do I fix when it hits the second session it skips scanf..

Answer 1

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!");

}

}

}