sum,sub,multi,div

#include<stdio.h>
double sum(double m,double n);
double sub(double o,double p);
double multi(double q,double r);
double div(double s,double t);

double main()
{
    double a,b,i,j,k,l;
    scanf("%lf%lf",&a,&b);
    i=sum(a,b);
    printf("%0.2lf+%0.2lf=%0.2lf\n",a,b,i);
    j=sub(a,b);
    printf("%0.2lf-%0.2lf=%0.2lf\n",a,b,j);
    k=multi(a,b);
    printf("%0.2lfx%0.2lf=%0.2lf\n",a,b,k);
    l=div(a,b);
    printf("%0.2lf/%0.2lf=%0.2lf\n",a,b,l);

}

double sum(double m,double n)
{
    double w=m+n;
    return w;
}
double sub(double o,double p)
{
    double x=o-p;
    return x;
}
double multi(double q,double r)
{
    double y=q*r;
    return y;
}
double div(double s,double t)
{
    double z=s/t;
    return z;
}