task22

#define _USE_MATH_DEFINES
#include <math.h>
#include <stdio.h>

typedef double (*function) (double x) ;

double search_solution(double a, double b, double eps, function f){
    double dx = b - a;
    double x = dx / 2;

    while ( abs( (*f)(x) ) > eps ){
        dx = dx / 2;
        x = a + dx;
        if ( (*f)(x) * (*f)(b) < 0 )
            a = x;
        else
            b = x;
    }

    return x;
}

double F(double x){
    return ( sin(x)-x+1 );
}

int main(){
    double x = search_solution(M_PI/2, M_PI, 0.000001, F);
    printf("Solution: %f", x);
    return 0;
}