c - How to search a string for a particular character or number or punctuation character -


i know use ctype.h various comparisons.i can make program have check weather given character upper case or lower case. suppose have entered string "singh21$" how check string contains uppercase,a dollar sign , @ least number. if string contains these 3 "its strong password".

you can try this:

for(int =0; < strlen(stringpassword); ++i) {      if( islower(stringpassword[i]) )         haslower = true;      if( isupper(stringpassword[i]) )         hasupper = true;      if( isdigit(stringpassword[i]) )         hasdigit = true;      if( isalnum(stringpassword[i]) )         hasspecial = true; }

and if flags true consider strong password.


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