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#include <stdio.h> #include <stdlib.h> #include <ctype.h> int main() { char x = 99; char fA = 99; if ( islower(fA) ){ printf("%s","valid lowercase letter\n"); } else { printf("%s","invalid lowercase ltr\n"); } char fa = tolower(fA); char y = tolower(x); printf("%c %c\n", x,y); printf("%c %c\n", fA,fa); return 0; }
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