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#include<stdio.h> #include<conio.h> #include<math.h> /* Defining equation to be solved. Change this equation to solve another problem. */ #define f(x) x*log10(x) - 1.2 int main() { float x0, x1, x2, f0, f1, f2, e; int step = 1; clrscr(); /* Inputs */ up: printf("\nEnter two initial guesses:\n"); scanf("%f%f", &x0, &x1); printf("Enter tolerable error:\n"); scanf("%f", &e); /* Calculating Functional Values */ f0 = f(x0); f1 = f(x1); /* Checking whether given guesses brackets the root or not. */ if( f0*f1 > 0.0) { printf("Incorrect Initial Guesses.\n"); goto up; } /* Implementing Regula Falsi or False Position Method */ printf("\nStep\t\tx0\t\tx1\t\tx2\t\tf(x2)\n"); do { x2 = x0 - (x0-x1) * f0/(f0-f1); f2 = f(x2); printf("%d\t\t%f\t%f\t%f\t%f\n",step, x0, x1, x2, f2); if(f0*f2 < 0) { x1 = x2; f1 = f2; } else { x0 = x2; f0 = f2; } step = step + 1; }while(fabs(f2)>e); printf("\n