习题6.7

 #include<stdio.h> #include<math.h> main() {     int n;     float zzl,cz=100;     printf("请输入增长率：");     scanf("%f",&zzl);     do        {            cz=cz*(1+zzl);            n++;        }while(cz<=200);          printf("%d年\n",n); }