判断Ｃ语言变量名是否合法

 

Ｃ语言实现判断变量名是否合法：

 

代码：

 

view
plainprint?

#include<stdio.h>  

#include<string.h>   

#include<stdlib.h>  

  

int main(){  

    int n,i,flag,len,flag1;  

    char *ss[]={"auto","break","case","char","const","continue","default","do","double","else","enum","extern","float","for","goto","if","int","long","register","return","short","signed","sizeof", "static", "struct", "switch", "typedef", "union", "unsigned","void", "volatile", "while"};  

    char s[1000];  

    scanf("%d",&n);  

    getchar();  

    while(n--){  

          flag=1;  

          flag1=1;  

            

          gets(s);  

          //printf("%s/n",s);  

          len=strlen(s);  

            

          if(s[0]=='_'||(s[0]>='a'&&s[0]<='z')||(s[0]>='A'&&s[0]<='Z')){  

                for(i=1;i<len;i++){  

                      if(!(s[i]=='_'||(s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z')||(s[i]>='0'&&s[i]<='9'))) {  

                             flag=0;  

                             break;                                                                                    

                      }              

                }         

          }  

          else{  

               flag=0;//最终标记；   

          }   

          if(flag==1){  

                for(i=0;i<32;i++){  

                       if(strcmp(ss[i],s)==0){  

                             flag1=0;  

                             break;                   

                       }             

                }  

                if(flag1==1){  

                   //puts(s);  

                   printf("yes/n");   

                }  

                else{  

                     printf("no/n");        

                }       

          }     

          else{  

               printf("no/n");        

          }  

    }  

    //system("pause");  

}