PowerWithUnsignedExponent

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//考虑Exponent周全#include<stdio.h>bool invalidInput=false;bool equal(double num1,double num2){if(num1-num2>-0.0000001&&num1-num2<0.0000001)return true;else return false;}double PowerWithUnsignedExponent(double base,unsigned int exp){if(exp==0)return 1;if(exp==1)return base;double result=PowerWithUnsignedExponent(base,exp>>1);result*=result;if(exp&0x1==1)result=result*base;return result;}double Power(double base,int exponent){if(equal(base,0.0)&&exponent<0){invalidInput=true;return 0.0;}unsigned int exp=(unsigned int)exponent;if(exponent<0)exp=(unsigned int)(-exponent);double result=PowerWithUnsignedExponent(base,exp);if(exponent<0)result=1/result;return result;}void main(){double result=Power(2,3);if(!invalidInput)   printf("%3.2f\n",result);else printf("输入无效的数字\n");result=Power(-2,3);if(!invalidInput)  printf("%3.2f\n",result);else printf("输入无效的数字\n");result=Power(2,0);if(!invalidInput)   printf("%3.2f\n",result);else printf("输入无效的数字\n");result=Power(0,0);if(!invalidInput)   printf("%3.2f\n",result);else printf("输入无效的数字\n");result=Power(0,4);if(!invalidInput)printf("%3.2f\n",result);else printf("输入无效的数字\n");result=Power(0,-4);if(!invalidInput)printf("%3.2f\n",result);else printf("输入无效的数字\n");}
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