this is my programme, i try it but there is a mistake, can you help to find it :the request is above
#include<stdio.h>
#include<math.h>
#define SENTINEL 'Q'
int menu();
int distance(int);
void prompt();
int main() {
char choice;
int x1,x2,y1,y2,d,m;
do {
choice = menu();
switch(choice) {
case '1':
printf("\n Enter the x1 :");
scanf(" %d" ,&x1);
printf("\n Enter the x2 : ");
scanf(" %d" , &x2);
printf("\n Enter the y1 :");
scanf(" %d", &y1);
printf("\n Enter the y2 :");
scanf(" %d", &y2);
printf("\n the distance is: %d", distance(m));
break;
case 'Q':
break;
default:
printf("\n INVALID INPUT");
}
} while(choice !=SENTINEL);
printf("\n Bye :)");
scanf(" %lf");
}
int menu() {
char choice;
printf("\n ");
printf("\n ******** Menu ********** ");
printf("\n ");
printf("\n ** 1 ** distance ");
printf("\n ** Q ** Quit ");
printf("\n ");
printf("\n  choice: ");
scanf(" %c", &choice);
return(choice);
}
int distance(m) {
int x1,x2,y1,y2,d;
if (x1<x2 && y1<y2){
d=((x2x1)*(x2x1))+((y2y1)*(y2y1));
m=sqrt(d);
}
else if (x1<x2 && y2<y1){
d=((x2x1)*(x2x1))+((y1y2)*(y1y2));
m=sqrt(d);
}
else if (x2<x1 && y2<y1){
d=((x1x2)*(x1x2))+((y1y2)*(y1y2));
m=sqrt(d);
}
else if (x2<x1 && y1<y2){
d=((x1x2)*(x1x2))+((y2y1)*(y2y1));
m=sqrt(d);
}
return(m);
}
Write a function “distance” that takes four arguments corresponding to the Cartesian Coordinates of two points (x1, y1) and (x2, y2), and returns the distance between the two points.
 Call your function from a main program (write a complete program)
 Your program should execute iteratively till a Sentinel value is types
