#include <stdio.h>
void main ()
{
printf ("PRN-2301106083");
int a, b, r;
char s;
printf ("\n\nEnter the number 'A':");
scanf ("%d", &a);
printf ("\nEnter the number 'B'");
scanf ("%d",&b);
printf ("\nEnter the operator '+,-,*,/,%':");
scanf ("%c", &s);
switch (s)
{
case '+':
printf ("\nYou have entered addition!");
r=a+b;
printf ("\nThe output is: %d", r);
break;
case '-':
printf ("\nYou have entered substraction!");
r=a-b;
printf ("\nThe output is: %d", r);
break;
case '*':
printf ("\nYou have entered multiplication!");
r=a*b;
printf ("\nThe output is: %d", r);
break;
case '/':
printf ("\nYou have entered division!");
r=a/b;
printf ("\nThe output is: %d", r);
break;
case '%':
printf ("\nYou have entered modulus!");
r=a%b;
printf ("\nThe output is: %d", r);
break;
default:
printf ("\nInvalid Choice")
}
}
It will straight away print the last printf's Invalid Choice even when I have not enter the operator from the previous commmand.If anyone can pls send the corrected code or point out what's wrong then pls do.
The %c conversion specifier won't skip any leading whitespace automatically. One solution to this problem is to put a space before the conversion specifier in the format string, which "tells" scanf to skip leading whitespace:
scanf(" %c", &s);
Finally, with this fix, your code should look like this:
#include <stdio.h>
void main ()
{
printf ("PRN-2301106083");
int a, b, r;
char s;
printf ("\n\nEnter the number 'A':");
scanf ("%d", &a);
printf ("\nEnter the number 'B'");
scanf ("%d",&b);
printf ("\nEnter the operator '+,-,*,/,%':");
scanf (" %c", &s);
switch (s)
{
case '+':
printf ("\nYou have entered addition!");
r=a+b;
printf ("\nThe output is: %d", r);
break;
case '-':
printf ("\nYou have entered substraction!");
r=a-b;
printf ("\nThe output is: %d", r);
break;
case '*':
printf ("\nYou have entered multiplication!");
r=a*b;
printf ("\nThe output is: %d", r);
break;
case '/':
printf ("\nYou have entered division!");
r=a/b;
printf ("\nThe output is: %d", r);
break;
case '%':
printf ("\nYou have entered modulus!");
r=a%b;
printf ("\nThe output is: %d", r);
break;
default:
printf ("\nInvalid Choice");
}
}