Numerical method c programs for engineers

 // Some numerical techniques C-program

#include<stdio.h>
#include<stdlib.h>
#include"functions.h"
int main()
{
    int choice;
    while(1)
    {
        printf("\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");

        printf("\n\t\tMENU");
        printf("\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");

        printf("\n1. BISECTION");

        printf("\n2. REGULA FALSI METHOD");

        printf("\n3. NEWTON RAPSHON METHOD");

        printf("\n4. SECANT METHOD");

        printf("\n5. SUCSSIVE APPROXIMATION METHOD");

        printf("\n6. GAUESSIAN METHOD");

        printf("\n7. LEGRANGENCE INTERPOLATION METHOD");

        printf("\n8. LEGRANGENCE INVERSE INTERPOLATION METHOD");

        printf("\n9. NEWTONS BACKWARD INTRPOLATION METHOD");

        printf("\n10. NEWTONS FORWARD INTERPOLATION METHOD");

        printf("\n11. TRAPIZOIDAL METHOD");

        printf("\n12. SIMPSONS 1 BY 3 METHOD");

        printf("\n13. LU DECOMPOSITION");

        printf("\n14. EULERS METHOD");

        printf("\n15. RUNGE KUTTA 2 ORDER");

        printf("\n16. RUNGE KUTTA 4 ORDER");

        printf("\n\n ENTER YOUR CHOICE = ");



        scanf("%d",&choice);


        switch(choice)
        {
            case 1:
                bisection();
                break;
            case 2:
                regula_falsi();
                break;
            case 3:
                newtonrapson();
                break;
            case 4:
                secant();
                break;
            case 5:
                succesive_approximation();
                break;
            case 6:
                gauessian();
                break;
            case 7:
                legrangence();
            break;
            case 8:
                legrangence_inverse_interpolation();

break;
            case 9:
                backward_interpolation();
                break;
            case 10:
                forward_interpolation();
                break;
            case 11:
                trapizoidal();
                break;
            case 12:
                simpsons_1by3();
                break;
            case 13:
                lu();
                break;
            case 14:
                eulers();
                break;
            case 15:
                rk_2_order();
                break;
            case 16:
                rk_4_order();
                break;
            case 17:
                exit(1);

            default:
                printf("\nENTER PROPER VALUE\n");
        }
    }
}