c语言字符串整数转换

来源：互联网发布：青蛙寿命知乎编辑：程序博客网时间：2024/06/01 10:35

//  http:blog.csdn.net/vinfcent/article/details/63310056

//****字符串转十六int StrToHex(char *str, int num){if (*str == '0'){str+=2;}while(*str != '\0'){if ((*str >= '0')&&(*str <= '9')){num = num*16 + (*str - '0');str++;}else if (((*str >= 'a')&&(*str <= 'f'))){num =num*16+(*str - 'a')+10;str++;}else if (((*str >= 'A')&&(*str <= 'F'))){num =num*16+(*str - 'A')+10;str++;}}if (*str == '-'){num = -num;}return num;}//*****字符串转整数int StrToInt(char *str, int num){if (*str == '-'){str++;}while(*str != '\0'){    num = num*10 + (*str - '0');str++;}if (*str == '-'){num = -num;}return num;}//*****整数转字符串void IntToStr(int num,char str[]){int i = 0,j=0;char buff[32] = {0};int n = num;if (num < 0){num = -num;}do {buff[i++] = num%10 +'0';num = num/10;} while (num);if (n < 0){buff[i++] = '-';}buff[i] = '\0';i--;int cnt=i;for (;j <= cnt; j++){str[j] = buff[i--];}str[j] = '\0';}//*****除法及取模实现函数,不考虑负数int funDiv(int a,int b, bool flag){int i = 0;if(b == 0)//不能为0{return;}while(a >= b){a = a-b;i++;}if (flag)//  /{return i;} else// %{return a;}}//******实现库函数memcpy()void mymemcpy(void *dest,const void *src,int cnt){char *dest_t = (char*)dest;const char *src_t = (const char*)src;while(cnt--){*dest_t = *src_t;dest_t++;src_t++;}}

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