Lab 4 part C

#include <stdio.h>// Standard Library for Input Output
#include <math.h> //Math library
#define LITER_GAL 3.78544
//Liters per Gallon

double computation(double num1, double num2,double num3){//Function and function definition.
double comp;//computation of the function.
for(;;){//infinite for loop
printf("Canadian Price per liter: ");
scanf("%lg",&num2);
if(num2<0){
printf("Re-enter; Must be positive.\n");
printf("-----------------------\n");}
else if (num2>0){
break;}}//breaks from the infinite loop if the num2 is bigger than 0. Continues to the bottom parts.
comp= num1*num2*num3;//Liter per Gallon* $US per $Can*$Can per liter.
printf("$Can= $%lg, $USD= $%lg\n",num2,comp);
printf("\n--------------------------------------------------\n");
return comp;
}

void banner (void){// banner function to print out my name and class.
  printf("--------------------------------------------------");
  printf("\nMalachi Sor\nCSCI 1109 Intro to C Programming Class\n");
  printf("--------------------------------------------------\n");
  printf("--------------------------------------------------");
}

int main(void) {
long double $US_PER_CAN;// defining the variables as long doubles inorder to get more bits for the numbers
long double $CAN_PER_LITER;
long double USD_PER_GALLON;
int number;
banner();// Function call for banner
for(;;){//infinite loop.
printf("\nEnter the exchange rate, USD per CAN.D: ");
scanf("%Lg",&$US_PER_CAN);
printf("--------------------------------------------------\n");
printf("--------------------------------------------------\n");
if ($US_PER_CAN<0){printf("Re-enter the US per CAN it must be positive: ");//if the $US_PER_CAN is lower than 0, then the program will print the statement out and return to the beginning of the Infinite Loop.
printf("\n-------------");}
else if ($US_PER_CAN>0){break;}}//If the $US_PER_CAN is bigger than 0, then the program will "break" out of the loop and continue to the while loop.

while($US_PER_CAN>=1){// This cannot be equal to 0 because the USD when printed out will always be $0. So we start at 1.
USD_PER_GALLON=computation($US_PER_CAN, $CAN_PER_LITER,LITER_GAL); //Function call of the computation.

for(;;){//infinite loop
  printf("Enter '1' to continue or '0' to stop: ");
  scanf("%i",&number);

  printf("--------------------------------------------------\n");
if(number==1){USD_PER_GALLON=computation($US_PER_CAN, $CAN_PER_LITER,LITER_GAL);}if (number==0){return 0;}}}
//the if statements are the query loops and will check the user input. If they enter 1 then the program will loop back and continue. If the user enters 0 then the program will stop.

// the return0 will cause the program to stop looping.
  return 0;}