Program is not responding in Code::blocks after reading my input - c

Question

I am trying to make a program within code::blocks that will allow me to select multiple unit conversions to do. However, whenever I build and compile and reach the point in the program where it scans in my input for the variable "choice", code::blocks displays a window immediately afterwards that says that my .exe has stopped working and I can't figure out why this is the case. I am using the GNU GCC Compiler. Any help would be enormously appreciated.
#include <stdio.h>
int main()
{
float fahrenheit;
float celsius;
float pound;
float kilogram;
float inch;
float centimeter;
float mph;
float kph;
int foc;
int pok;
int ioc;
int mok;
int choice;
printf("\n1. Temperature Conversion\n");
printf("\n2. Weight Conversion\n");
printf("\n3. Length Conversion\n");
printf("\n4. Speed Conversion\n");
printf("\n5. Exit Program\n");
printf("\n");
printf("\nEnter the number of the program you would like to run :\n");
printf("\n");
scanf("%d", choice);
//Temperature Conversion
if(choice == 1) {
printf("\n1. Convert from Celsius to Fahrenheit\n");
printf("\n2. Convert from Fahrenheit to Celsius\n");
printf("\nEnter the number that corresponds with the conversion you would like to do:\n");
printf("\n");
scanf("%d", &foc);
if(foc == 1) {
//option 1
printf("\nEnter your temperature in Celsius : ");
scanf("%f", &celsius);
fahrenheit = 32 + (celsius * 1.8);
printf("\nYour temperature in Fahrenheit : %f ", fahrenheit);
}
else {
//option 2
printf("\nEnter your temperature in Fahrenheit : ");
scanf("%f", &fahrenheit);
celsius = (fahrenheit - 32) * 0.55555555;
printf("\nYour temperature in Celsius : %f ", celsius);
}
}
//Weight Conversion
else if(choice == 2) {
printf("\n1. Convert from Pound to Kilogram ");
printf("\n2. Convert from Kilogram to Pound ");
printf("\nEnter the number that corresponds with the conversion you would like to do: ");
printf("\n ");
scanf("%d", &pok);
if(pok == 1) {
//option 1
printf("\nEnter your weight in pounds : ");
scanf("%f", &pound);
kilogram = (2.20462 * pound);
printf("\nYour weight in kilograms : %f ", kilogram);
}
else {
//option 2
printf("\nEnter your weight in kilograms : ");
scanf("%f", &kilogram);
pound = (kilogram/2.20462);
printf("\nYour weight in pounds : %f ", celsius);
}
}
//Length Conversion
else if(choice == 3) {
printf("\n1. Convert from inches to centimeters ");
printf("\n2. Convert from centimeters to inches ");
printf("\nEnter the number that corresponds with the conversion you would like to do: ");
printf("\n ");
scanf("%d", &ioc);
if(ioc == 1) {
//option 1
printf("\nEnter your length in inches : ");
scanf("%f", &inch);
centimeter = (inch/2.54);
printf("\nYour length in centimeters : %f ", centimeter);
}
else {
//option 2
printf("\nEnter your length in centimeters : ");
scanf("%f", &centimeter);
inch = (centimeter*2.54);
printf("\nYour length in inches : %f ", inch);
}
}
//Speed Conversion
else if(choice == 4) {
printf("\n1. Convert from mph to kph ");
printf("\n2. Convert from kph to mph ");
printf("\nEnter the number that corresponds with the conversion you would like to do: ");
printf("\n ");
scanf("%d", &mok);
if(mok == 1) {
//option 1
printf("\nEnter your speed in mph : ");
scanf("%f", &mph);
kph = (mph/1.60934);
printf("\nYour speed in kilometers: %f ", kph);
}
else {
//option 2
printf("\nEnter your speed in kph : ");
scanf("%f", &kph);
mph = (1.60934*kph);
printf("\nYour length in inches : %f ", mph);
}
}
else if(choice == 5) {
printf("\nProgram has ended. Thanks for your time!");
}
else {
printf("\nThat is not a valid program number. ");
}
}

Answer 1

You have to pass the pointer to the choice variable (i.e. &choice) to your scanf() call, just as you've done for your other scanf() uses.
I.e. instead of
scanf("%d", choice);
use
scanf("%d", &choice);

Answer 2

scanf() reads a value from the user and the address of the variable must be represented in the syntax
if not represented the program takes the garbage value so