数据结构与算法1-2 C语言运行时间检测算法

 #include <stdio.h>
 #include <math.h>
 #include <time.h>
 
 clock_t start,stop;
 #define max 1e7
 #define num 100
 void putin(double *);
 void f(double *,int ,double );
 void ff(double *a,int n,double x);
 void timetext(void (*point)(double *,int,double),double *,int ,double);
 void main()
 {
     double a[num];
     putin(a);
     timetext(f,a,num,1.1);
     timetext(ff,a,num,1.1);
 
 }
 
 void putin(double *a)
 { int i;
     ;i<num;i++)
         *(a+i)=(double)i;
 }
 
 void f(double *a,int n,double x)
 {   int i;
     ;
     ;i<n;i++)
         sum=sum+a[i]*pow(x,i);
 
 }
 
 void ff(double *a,int n,double x)
 {   int i;
     ];
     ;i>=;i--)
         sum=sum*x+a[i];
 }
 
 void timetext(void (*point)(double *,int,double),double *a,int n,double x)
 {
     int i;
     double duration;
     start=clock();
     ;i<max;i++)
         (*point)(a,n,x);
     stop=clock();
     duration=((double)(stop-start))/max/CLK_TCK;
     printf("%f\n",duration);
     printf("%f\n",(double)(stop-start));
     printf("\n");
 }