#include#includevoid main(){int n,s;double s0;printf("本程序计算2的n次方,请输入次数n：\n");scanf("%d",&n);if(n>=0){s=pow(2.0,n);printf("%d\n",s);}else{s0=1.0/pow(2.0,abs(n));printf("%f\n",s0);}}...