Program for Runge-Kutta-4 (RK-4) Method #include <stdio.h> #include <conio.h> #include <math.h> float f(float x,float y) { return ((y*y-x*x)/(y*y+x*x)); //y'=f(x,y)=equation } void main() { float x0,y0,h,xn,yn; printf("Enter x0 and y0: "); scanf("%f%f",&x0,&y0); //y(x0)=y0 printf("Enter xn: "); scanf("%f",&xn); printf("Enter interval(h): "); scanf("%f",&h); do { float m1=f(x0,y0); float m2=f(x0+h/2,y0+m1*h/2); float m3=f(x0+h/2,y0+m2*h/2); float m4=f(x0+h,y0+m3*h); float m=(m1+2*m2+2*m3+m4)/6; yn=y0+m*h; //for next iteration x0=x0+h; y0=yn; }while(x0<xn); printf("\n\nHence, y(%0.1f)=%0.4f",xn,yn); getch(); }
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