integal

#include<stdio.h>
#include<math.h>
double f(double x){
    return sin(x);

}

main(){
    int i,n ;
    double a, b, h, x,sum=0,integral;
    printf("enter the number of sub-interval:");
    scanf("%d ",&n);
    printf("enter the initial limit: ");
    scanf("%lf",&a);
    printf("enter the final limit:");
    scanf("%lf",&b);
    h=fabs(b-a)/n;
    for(i=1;i<n;i++){
        x=a+i*h;
        sum+=f(x);
    }
    integral=(h/2)*(f(a)+f(b)+2*sum);
    printf("\n The integral is :%lf\n",integral);
    return 0;



}