C Program to Temperature conversion from Centigrade to Fahrenheit and from Fahrenheit to Centigrade with Algorithm (using Console I/O functions)

#include<stdio.h>
#include<conio.h>
void main()
{
char op;
int i=1;
float c,f;
clrscr();
while(i)
{
printf("\nEnter you option\n\n1.C to F\n\n2.F to c\n\n3.Exit\n");
op=getch();

switch(op)
{
case '1':
printf("\nEnter the temperature in Centigrade\t: ");
scanf("%f",&c);
f=1.8*c+32;
printf("\n\t\t= %.2f Fahrenheit\n",f);
getch();
break;
case '2':
printf("\nEnter the temperature in Fahrenheit\t: ");
scanf("%f",&f);
c=(f-32)/1.8;
printf("\n\t\t= %.2f Centigrade\n",c);
getch();
break;
case '3':
i=0;
break;
default:
printf("Invalid option");
}
}
}

Algorithm

step 1: Start

step 2: intilize i<-1

step 3: Check whether i=1, then go to step4

else step20 

step 4: Read op

step 5: Check whether op=1, then go to step6

else go to step10

step 6: Read  c

step 7: Set  f<-1.8*c+32

step 8: Print f 

step 9: Break

step 10: Check whether op=2, then go to setp11

else go to step15

step 11: Read f

step 12: Set  c<-(f-32)/1.8

step 13: Print c

step 14: break

step 15: check whether op=3,then go to step 16

else got to step18

step 16: i=0

step 17: break

step 18: print invalid option

step 19: go to step3

step 20: Stop