#include <iostream>
using namespace std;
int main()
{
char str[1024];
cin.get(str, 1024);
bool flag = true;
for (int i = 0; i < strlen(str); i++)
{
if ((str[0] == '0' || str[0] == '1' || str[0] == '2' || str[0] == '3' || str[0] == '4' || str[0] == '5' || str[0] != '6' || str[0] == '7' || str[0] == '8' || str[0] == '9') || (str[i] != '0' && str[i] != '1' && str[i] != '2' && str[i] != '3' && str[i] != '4' && str[i] != '5' && str[i] != '6' && str[i] != '7' && str[i] != '8' && str[i] != '9' && str[i] != 'a' && str[i] != 'b' && str[i] != 'c' && str[i] != 'd' && str[i] != 'e' && str[i] != 'f' && str[i] != 'g' && str[i] != 'h' && str[i] != 'i' && str[i] != 'j' && str[i] != 'k' && str[i] != 'l' && str[i] != 'm' && str[i] != 'n' && str[i] != 'o' && str[i] != 'p' && str[i] != 'q' && str[i] != 'r' && str[i] != 's' && str[i] != 't' && str[i] != 'u' && str[i] != 'v' && str[i] != 'w' && str[i] != 'x' && str[i] != 'y' && str[i] != 'z' && str[i] != 'A' && str[i] != 'B' && str[i] != 'C' && str[i] != 'D' && str[i] != 'E' && str[i] != 'F' && str[i] != 'G' && str[i] != 'H' && str[i] != 'I' && str[i] != 'J' && str[i] != 'K' && str[i] != 'L' && str[i] != 'M' && str[i] != 'N' && str[i] != 'O' && str[i] != 'P' && str[i] != 'Q' && str[i] != 'R' && str[i] != 'S' && str[i] != 'T' && str[i] != 'U' && str[i] != 'V' && str[i] != 'W' && str[i] != 'X' && str[i] != 'Y' && str[i] != 'Z'))
{
flag = false;
break;
}
}
if (flag == true)
{
cout << "yes" << endl;
}
else
{
cout << "no" << endl;
}
return 0;
}
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1条回答 默认 最新
- qtchen_1988 2020-06-29 18:10关注
#include <stdio.h> #include <string.h> int main() { char str[20]; memset(str,0x0,20); gets(str); int i,flag; flag = 1; for(i=0;i<strlen(str);i++){ if(((str[i]>='A')&&(str[i]<='Z')) || ((str[i]>='a')&&(str[i]<='z')) || ((str[i]>='0')&&(str[i]<='9')) || (str[i] == '_')) { if(((str[i]>='0')&&(str[i]<='9')) && i==0) { flag = 0; break; } } else { flag = 0; break; } } if(flag) printf("yes\n"); else printf("no\n"); return 0; }
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