#include
main()
{ int i,n;
float m,y,length;
length=100;
printf("Please input the times:");
scanf("%d",&n);
for(i=1;ivoid main(){ int i,n;float m=1,y,length;length=100;printf("Please input the times:");scanf("%d",&n);for(i=1;i<=n-1;i++){m=m*(1.0/2);
y=100*m;
length=length+y;}printf("length=%f\n",length);}主要有两个地方错误：第一、m在定义的时候一定要赋值，编程要养成定义任何变量要赋值的习...
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