What's wrong with the following . Its simple calculator but not working correctly on computer as well as mobile.

Question

#include<stdio.h>

int main()
{

float a,b;
char c;

printf("Enter two numbers\n");
scanf("%f%f",&a,&b);

printf("press + for addition - for subtraction * for multiplication or / for division\n");
scanf("%c",&c);

switch(c)
{

case '+' :

printf("%f + %f = %f",a,b,a+b);
break;

case '-':
printf("%f - %f = %f",a,b,a-b);
break;

case '*' :
printf("%f * %f = %f",a,b,a*b);
break;

case '/' :
printf("%f / %f = %f",a,b,a/b);
break;

default :
printf("Entered Wrong Choice");

}

}

Answer 1

Two options:-
printf("Enter two numbers\n");
scanf("%f %f",&a,&b);
fflush(stdin); // add this...or

printf("press + for addition - for subtraction * for multiplication or / for division\n");
scanf(" %c",&c); // put a space just before the %c.

Answer 2

Yes it works but please can you tell me why space is necessary before the %c.