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Use isdigit Function in if statement

#include <stdio.h> #include <ctype.h> main() {   char cResponse = '\0';   printf("\nPlease enter a letter: ");   scanf("%c", &cResponse);   if ( isdigit(cResponse)== 0 )     printf("\nThank you\n");   else     printf("\nYou did not enter a letter\n"); } Please enter a letter: 1 You did not enter a letter