Code:
// Multi Function Calculator
#include <stdio.h>
#include <stdlib.h>
#define Pi 3.14159
int main(void)
{
char num,ans;
float voltage, resistance , current, amps, miles, km;
float r, A, in, ft;
double F, C;
do{
printf("Please choose from following calculcations.\n");
printf("Choose 1 to calculate Voltage.\n");
printf("Choose 2 to calculate Current.\n");
printf("Choose 3 to calculate Resistance.\n");
printf("Choose 4 to calculate Miles to Kilometers.\n");
printf("Choose 5 to calculate Kilometers to Miles.\n");
printf("Choose 6 to calculate Fahrenheit to Celisus.\n");
printf("Choose 7 to calculate Celisus to Fahrenheit.\n");
printf("Choose 8 to calculate the Area of a Circle.\n");
printf("Choose 9 to calculate Inches to Feet.\n");
printf("Press enter to quit.\n");
scanf("%c",&num);
switch(num)
{
case '1' : // Volatage
printf("Enter the current in amps =>");
scanf("%f",&s);
printf("Enter the resistance in ohms =>");
scanf("%f",&resistance);
voltage = amps * resistance;
printf("\nThe voltage is %0.2f volts.\n\n",voltage);
break;
case '2' : // Current
printf("Enter the voltage in volts =>");
scanf("%f",&voltage);
printf("Enter the resistance in ohms =>");
scanf("%f",&resistance);
current = voltage / resistance;
printf("\nThe current is %0.2f amps.\n\n",current);
break;
case '3' : // Resistance
printf("Enter the voltage in volts =>");
scanf("%f",&voltage);
printf("Enter the current in amps =>");
scanf("%f",&s);
resistance = voltage / amps;
printf("\nThe resistance is %0.2f ohms.\n\n",resistance);
break;
case '4' : // Miles to KM
printf("Enter number of miles =>");
scanf("%f", &miles);
km = miles*1.609334;
printf("\n%.0f miles is %.2f kilometers.\n\n", miles, km);
break;
case '5' : // KM to Miles
printf("Enter number of kilometers =>");
scanf("%f", &km);
miles = km*0.6214;
printf("\n%.0f kilometers is %.2f miless.\n\n", km, miles);
break;
case '6' : // F* to C*
printf("Enter degrees Fahrenheit =>", F);
scanf("%lf", &F);
C = (F-32)*5/9;
printf("\n%.0lf degrees Farenheit is %.2lf degrees Celsius.\n\n", F, C);
break;
case '7' : // C* to F*
printf("Enter degrees Celsius =>", C);
scanf("%lf", &C);
F = (C*(9/5))+32;
printf("\n%.0lf degrees Celsius is %.2lf degrees Farenheit.\n\n", C, F);
break;
case '8' : //Area of circle
printf("Enter radius of the circle =>", r);
scanf("%f", &r);
A = Pi*r*r;
printf("\nThe area of the circle is %.2f.\n\n", A);
break;
case '9' : // Inches to feet
printf("Enter number of inches =>", in);
scanf("%f", &in);
ft = in/12;
printf("\n%.0f inches is %.2f feet.\n\n", in, ft);
break;
default : exit(0);
}
{
printf("Do you want another calculation?(Y/N)=>",ans);
scanf(" %c",&ans);
printf("\n");printf("\n");
system("cls");
}
} while (ans == 'y');
return(0) ;
}