这个问题挺有名的，贴代码：

#include "stdio.h"
void main( )
{
//FILE *fp;
int i=1;
double x=500.0,s=1000.0,oil;
//fp=fopen("data.dat","w");
do
{
//fprintf(fp,"No=%-7dcoord=%10.6f\toil=%11.6f\n",i,s-x,500.0*i);
printf("No=%-7dcoord=%10.6f\toil=%11.6f\n",i,s-x,500.0*i);
s-=x;
x=500.0/(2*i+1);
i++;
}while(s>=x);
oil=500.0*(i-1)+2*s*(i-1)+s;
//fprintf(fp,"No=%-7dcoord=%10.6f\toil=%11.6f\n",i,0.0,oil);
//fprintf(fp,"最少的总油耗为：%lf升.\n",oil);
printf("No=%-7dcoord=%10.6f\toil=%11.6f\n",i,0.0,oil);
printf("最少的总油耗为：%lf升.\n",oil);
//fclose(fp);
}

穿越沙漠