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请将代码补充完整。01 #include 0203 int str2int(char str); //字符串转化为int数值04 char getString(char str); //输入字符串05 int isNum(int);0607 int main()08 {09 char str[21];10 int i;11 getString(str);12 i = str2int(str);13 printf("%d\n", i);14 printf("%d", ii);15 return 0;16 }1718 int str2int(char str)19 {20 int rs = 0;21 while (str)22 {23 if (isNum(str))24 rs = rs 10 + str - '0';25 ++str;26 }27 return rs;28 }2930 int isNum(int n)31 {32 return n >= '0'&&;33 }3435 char getString(char str)36 {37 //assert(str); //可自行扩充，对str进行一些合法性检查，或退出程序，或弹窗，或输出错误信息38 char buffer = str;39 while (1)40 {41 char temp = getchar();42 if (temp == '\n')43 ;44 buffer = temp;45 ++buffer;46 }47 buffer = 0;48 ;49 }

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