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´úÂë gen.c£º
CODE:
#include
#include

#define FUNC(x) exp(x)

const double begin=-8*3.1415926;
const double end=8*3.1415926;
const double step=1e-4;

int main()
{
        double num;

        for(num=begin;num         {
                printf("%20.20g %20.20g\n",num,FUNC(num));
        }

        return 0;
}

´úÂë compare.c
CODE:
#include
#include

#define FUNC(x) exp(x)


int main()
{
        double num=0,result=0;

        while(!feof(stdin))
        {
                scanf("%lf %lf",&num,&result);
                if(fabs((FUNC(num)-result)/FUNC(num))>1e-15
                    || fabs((FUNC(num)-result)/result)>1e-15)
                        printf("%6g %.20g %.20g %.3g %.3g\n", num, result,
                                  FUNC(num),
                                  fabs((FUNC(num)-result)/FUNC(num)),
                                  fabs((FUNC(num)-result)/result));
        }

        return 0;
}

²âÊÔÃüÁ
CODE:
./gen | ./compare

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