A library function, islower(), takes a single character (a letter) as an argument and returns a
nonzero integer if the letter is lowercase, or zero if it is uppercase. This function requires the header
file CTYPE.H. Write a program that allows the user to enter a letter, and then displays either zero or
nonzero, depending on whether a lowercase or uppercase letter was entered.
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Expert's answer
2013-03-12T11:55:23-0400
#include <stdio.h> #include <ctype.h>
int main() { int ch; printf("Enter a character: "); ch = getchar();
if (islower(ch)) puts("0"); else puts("1"); return 0; }
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