Find the answer!

R language: integrate(function(x){8*x+2/5},0,10)

MATLAB language: vpa(int((8*x+2/5),0,10))

C programming with the GSL:

    #include <stdio.h>
    #include <math.h>
    #include <gsl/gsl_integration.h>
    double f(double x,void * params){
        double f = 8*x+2./5;
        return f;
    }
    int main (void){
        gsl_integration_workspace * g = gsl_integration_workspace_alloc (1000);
        double result, error;
        gsl_function F;
        F.function = &f;
        gsl_integration_qags (&F,0,10,0,1e-7,1000,g,&result,&error);
        printf("result= %.18f\n",result);
        gsl_integration_workspace_free (g);
        return 0;
    } --------------------------------------------------------------------------------------
    # g++ -Wall -I/usr/lib/include -c fun.c
    # g++ fun.o -lgsl -lgslcblas -lm -o main.out
    # ./main.out