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#include<stdio.h> #include<ctype.h> void main() { char a[10]; int id, i=1; printf("\n Enter an identifier:"); gets (a); if (isalpha(a[0])) id=1; else printf("\n Not a valid identifier"); while (a[i]!= '\0') { if(!isdigit(a[i]) &&!isalpha (a[i])) { id=0; break; } i++; } if(id==1) printf("\n Valid identifier"); }
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