C Program To Check The String Is Valid Identifier Or Not
#include<stdio.h>#include<conio.h>#include<string.h>int main(){char string[25];int count=0,flag;printf("Enter any string: ");gets(string);if( (string[0]>='a'&&string[0]<='z')||(string[0]>='A'&&string[0]<='Z')||(string[0]=='_')){for(int i=1;i<=strlen(string);i++){if((string[i]>='a'&& string[i]<='z')||(string[i]>='A' && string[i]<='Z')||(string[i]>='0'&& string[i]<='9')||(string[i]=='-')){count++;}}if(count==strlen(string)){flag=0;}}else{flag=1;}if(flag==1)printf("%s is not valid identifier",string);elseprintf("%s is valid identifier",string);return 0;}
Output #2
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