两种方法实现字符串转换为数字

只做了正整数的情况，你看是不你想要的#include <stdio.h>#include <string.h>int String2Int1(char *pHead, char *pEnd){ int retVal=0;while (pEnd>=pHead) { retVal*=10;retVal+=*pHead-'0';pHead++;} return retVal;}int String2Int2(char *pHead, char *pEnd){ if (pHead==pEnd) { return *pHead - '0';} else { return 10 * String2Int2(pHead, pEnd-1)+*pEnd-'0';}}int main(){ char *p="123456";int r=0,t=0;r=String2Int2(p,p+strlen(p)-1);printf("%d\n",r);t=String2Int2(p,p+strlen(p)-1);printf("%d\n",t);return 0;} 收起