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Using an enumeration type

#include <stdio.h> enum months {     JAN = 1, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC }; int main() {     enum months month;     const char *monthName[] = { "", "January", "February", "March",        "April", "May", "June", "July", "August", "September", "October",       "November", "December" };        for ( month = JAN; month <= DEC; month++ ) {       printf( "%2d%11s\n", month, monthName[ month ] );    }     return 0; } 1 January 2 February 3 March 4 April 5 May 6 June 7 July 8 August 9 September 10 October 11 November 12 December