input.txt

编制一个词法分析程序

#include "stdio.h"
main()
{ 
    int i = 1;$ @                  /*定义整形变量*/  
                                  /*空行*/
    double t = 1.0, sum;
    for (sum = 0; t >= 1e-8; i ++)
     {
        sum += t;
        t = t/i;
     }
     printf("sum=%12.10f\n",sum);
     printf("end\n");
}