Here's a part of our program.
#include <stdio.h>
#include <stdlib.h>
int main()
{
int i, input, AvoCal, IdealCal, ComCal;
double n, P, V, T, V1, V2, n1, n2, P1, P2, T1, T2;
const float R=0.0821;
while(1)
{
printf("\n\nGas Laws Calculator\n\n");
printf("MENU\n");
printf("\n(1) Avogadro's Law\n");
printf("(2) Ideal Gas Law\n");
printf("(3) Combined Gas Law\n");
printf("(4) Quit\n");
printf("\nEnter your choice: ");
scanf("%d",&input);
break;
}
// Solutions
switch(input)
{case 1:
printf("\nAvogadro's Law\n");
printf("Please select what you want to calculate.\n");
printf("\n(1) Find Volume (V1)\n");
printf("(2) Find Volume (V2)\n");
printf("(3) Find Moles (n1)\n");
printf("(4) Find Moles (n2)\n");
printf("(5) Quit\n");
printf("\nEnter your choice: ");
scanf("%d",&AvoCal);
if (AvoCal==1)
{
printf("\nFind V1\n");
printf("Enter given values.\n");
printf("Value of V2: ");
scanf("%lf", &V2);
printf("Value of n2: ");
scanf("%lf", &n2);
printf("Value of n1: ");
scanf("%lf", &n1);
V1=(n1*V2)/n2;
printf("\nAnswer: V1= %.2lf", V1);
}
else if (AvoCal==2)
{
printf("\nFind V2\n");
printf("Enter given values.\n");
printf("Value of n2: ");
scanf("%lf", &n2);
printf("Value of V1: ");
scanf("%lf", &V1);
printf("Value of n1: ");
scanf("%lf", &n1);
V2=(n2*V1)/n1;
printf("\nAnswer: V2= %.2lf", V2);
}
else if (AvoCal==3)
{
printf("\nFind n1\n");
printf("Enter given values.\n");
printf("Value of n2: ");
scanf("%lf", &n2);
printf("Value of V1: ");
scanf("%lf", &V1);
printf("Value of V2: ");
scanf("%lf", &V2);
n1=(n2*V1)/V2;
printf("\nAnswer: n1= %.2lf", n1);
}
else if (AvoCal==4)
{
printf("\nFind n2\n");
printf("Enter given values.\n");
printf("Value of n1: ");
scanf("%lf", &n1);
printf("Value of V2: ");
scanf("%lf", &V2);
printf("Value of V1: ");
scanf("%lf", &V1);
n2=(n1*V2)/V1;
printf("\nAnswer: n2= %.2lf", n2);
}
else if (AvoCal==5);
exit (0);