convert c++ to c

shyn04 (2)
can anybody convert this c++ program to c..?
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#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
#include<math.h>
#include<dos.h>

double val=180;
char choice;

sinLaw();
case1()
    {
        double a1,a2,s1,b,c,C;


        clrscr();
            cout<<"Enter value for Angle A:";
                cin>>a1;
            cout<<"Enter value for Angle B:";
                cin>>a2;
            cout<<"Enter value for Side a:";
                cin>>s1;
                     b=((s1*sin(a1))/sin(a2));
                     c=((s1*(180-(a1+a2)))/sin(s1))/val;
                     C=asin((c*(sin(a2))/s1)*3.1416/val);

                     cout<<"\n\n\tb="<<b<<"\n\n\t";
                     cout<<"c="<<c<<"\n\n\t";
                     cout<<"C="<<C<<"\n\n\n\t\t\t";

                     cout<<"Would you like to try again?[Y/N]: ";
                     cin>>choice;

                     if((choice=='Y')||(choice=='y'))
                     sinLaw();

                     else if((choice=='N')||(choice=='n'))
                     exit(0);

                     else
                     {
                     cout<<"\t\t\tInvalid input!...";
                     clrscr();
                     cout<<"\n\n\n\t\t\tWould you like to try again?[Y/N]: ";
                     cin>>choice;

                     if((choice=='Y')||(choice=='y'))
                     sinLaw();

                     else if((choice=='N')||(choice=='n'))
                     exit(0);

                     }

        return 0;

            }

    case2()
    {
        double s1,s2,a1,c,C,B;

        clrscr();

            cout<<"Enter value for Side a:";
                cin>>s1;
            cout<<"Enter value for Side b:";
                cin>>s2;
            cout<<"Enter value for Angle A:";
                cin>>a1;
            
            B=asin((s2*sin(a1))/s1)/180;
            C=180-(a1+B);
            c=(s1*sin(C))/sin(a1);

            cout<<"\n\n\tB="<<B;
            cout<<"\n\n\tC="<<C;
            cout<<"\n\n\tc="<<c;

            cout<<"\n\n\t\t\tWould you like to try again?[Y/N]: ";
                     cin>>choice;

                     if((choice=='Y')||(choice=='y'))
                     sinLaw();

                     else if((choice=='N')||(choice=='n'))
                     exit(0);

                     else
                     {
                     cout<<"\t\t\tInvalid input!...";
                     clrscr();
                     cout<<"\n\n\n\t\t\tWould you like to try again?[Y/N]: ";
                     cin>>choice;

                     if((choice=='Y')||(choice=='y'))
                     sinLaw();

                     else if((choice=='N')||(choice=='n'))
                     exit(0);

                     }


        return 0;
            }

sinLaw()
        {
                char choice;
                clrscr();

                    gotoxy(25,5);

                        cout<<"-----T H E  S I N E  L A W-----";
                        cout<<"\n\n\t\t\tCase 1: 2 Angles and 1 Side [1]:";
                        cout<<"\n\t\t\tCase 2: 2 Sides and 1 Angle [2]:";
                        cout<<"\n\n\t\t\t\tQuit[Q/q]:";
                        cout<<"\n\n\t\t\t\tEnter your choice: [  ]\b\b\b";
                            cin>>choice;

                            switch(choice)

                                {

                                case '1':case1();break;
                                case '2':case2();break;
                                case 'Q':exit(0);break;
                                case 'q':exit(0);break;

                                }

                return 0;
                }

main()
{
        clrscr();
            sinLaw();
                getch();

        }
shyn04 (2)
i do it this way but the computation was not able to display..
i need help..
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#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<math.h>
#include<dos.h>

double val=180;
char choice;

sinLaw();
case1()
{
	double a1,a2,s1,b,c,C;
	clrscr();

		printf("Enter value for Angle A:\n");
		scanf("%d",&a1);
		printf("Enter value for Angle B:\n");
		scanf("%d", &a2);
		printf("Enter value for Side a:\n");
		scanf("%d", &s1);

		b=((s1*sin(a1))/sin(a2));
		c=((s1*(180-(a1+a2)))/sin(s1))/val;
		C=asin((c*(sin(a2))/s1)*3.1416/val);

		printf("\n\n\t b=%d\n\n\t", b);
		printf("c=%d\n\n\t", c);
		printf("C=%d\n\n\n\t\t\t", C);

		printf("Would you like to try again?[Y/N]:");
		scanf("%c", &choice);

			if((choice=='Y')||(choice=='y'))
			{
			sinLaw();}

			else if((choice=='N')||(choice=='y'))
			{
			exit(0);}

			else{
			printf("\t\t\tInvalid input!...");}

		clrscr();
		printf("\n\n\n\t\t\tWould you like to try again?[Y/N]:");
		scanf("%c",&choice);

			if((choice=='Y')||(choice=='y'))
			{
			sinLaw();}

			else if((choice=='N')||(choice=='n'))
			{
			exit(0);}

		return 0;
		 }

case2()
	{
	double s1,s2,a1,c,C,B;
	clrscr();

		printf("Enter value for side a:\n");
		scanf("%d", &s1);
		printf("Enter value for side b:\n");
		scanf("%d", &s2);
		printf("Enter value for Angle A:\n");
		scanf("%d", &a1);

		B=asin((s2*sin(a1))/s1)/180;
		C=180-(a1+B);
		c=(s1*sin(C))/sin(a1);

		printf("\n\n\tB:%d", B);
		printf("\n\n\tC:%d", C);
		printf("\n\n\tc:%d", c);

		printf("\n\n\t\t\tWould you like to try again?[Y/N]");
		scanf("%c", &choice);

			if((choice=='y')||(choice=='y'))
			{
			sinLaw();}

			else if((choice=='N')||(choice=='n'))
			{
			exit(0);}

			else{
			printf("\t\t\tInvalid input!...");
			}

		clrscr();
		printf("\n\n\n\t\t\tWould you like to try again?[/N]:");
		scanf("%c",&choice);
			if((choice=='Y')||(choice=='y'))
			{
			sinLaw();}
			else if((choice=='N')||(choice=='n'))
			{
			exit(0);}

		return 0;
		}
sinLaw()
{
	char choice;
	clrscr();
		gotoxy(25,5);
			printf("-----THE SINE LAW-----");
			printf("\n\t\t\tCase 1: 2 Angles and 1 Side[1]:");
			printf("\n\t\t\tCase 2: 2 Sides and 1 Angle [2]:");
			printf("\n\n\t\t\tQuit[Q/q]:");

			printf("\n\n\t\t\t\tEnter your choice:[]\b\b\b");
			scanf("%c", &choice);

			switch(choice)
			{
				case '1':case1();break;
				case '2':case2();break;
				case 'Q':exit(0);break;
				case 'q':exit(0);break;
			}
		return 0;
		}
main()
{
	clrscr();
		sinLaw();
		getch();
		}
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