#include <stdio.h>                        #include <stdio.h>

void main()                               void main

{   int i，sum=0;                         {   int i，sum=0;
    i=1;                                     while (i<=100)
    do                                      { sum=sum+i;
      {sum=sum+i;                             i++;
       i++;                                  }
      }                                      printf(″%d\n″，sum);
    while(i<=100);                        }
    printf(“%d\n″，sum)；

}

2  #include <stdio.h>
# include<math.h>
void main()
{ int s;float n，t，pi;
    t=1；pi=0;n=1.0;s=1;
  while(fabs(t)>=1e-6)
   {pi=pi+t;n=n+2;s=-s;t=s/n;}                   运行结果：pi=3.141594
     pi=pi*4;
    printf(″pi=%10.6f＼n″，