So I have this code here, and i am trying to make it so that if you

input anything besides the given letter inputs, it says “invalid selection” however it is not working. What am i missing

#include <stdio.h>
void printHelp () {
printf (“\n”);
printf (“a: a(x) = x*x\n”);
printf (“b: b(x) = x*x*x\n”);
printf (“c: c(x) = x^2 + 2*x + 7\n”);
printf (“q: quit\n”);
}
void a(float x) {
float v = x*x;
printf (” a(%.2f) = %.2f^2 = %.2f\n”, x, x, v);
} // end function a
void b(float x) {
float v = x*x*x;
printf (” b(%.2f) = %.2f^3 = %.2f\n”, x, x, v);
} // end function b
void c(float x) {
float v = x*x + 2*x + 7;
printf (” c(%.2f) = %.2f^2 + 2*%.2f + 7 = %.2f\n”,
x, x, x, v);
} // end function c
int menu () {
char selection;
float x;
printHelp ();
scanf (“%s”, &selection);
if (selection == ‘q’) return 1;
scanf (“%f”, &x);
if (selection == ‘a’) a(x);
if (selection == ‘b’) b(x);
if (selection == ‘c’) c(x);

// end function menu
else
{printf(“Invalid Selection \n”);} //If you do not select a valid letter this message will display
return 0;
}
int main() {
while (menu() == 0);
printf (“… bye …\n”);
return 0;
} // end main