Use switch case statements fall through so that both upper- and lowercase letters are evaluated in the switch-case structure.
#include <stdio.h> int main()/* ww w . j av a 2s. com*/ { char choice; puts("Meal Plans:"); puts("A - Breakfast, Lunch, and Dinner"); puts("B - Lunch and Dinner only"); puts("C - Dinner only"); printf("Your choice: "); scanf("%c",&choice); printf("You've opted for "); switch(choice) { case 'A': case 'a': printf("Breakfast, "); case 'B': case 'b': printf("Lunch and "); case 'C': case 'c': printf("Dinner "); default: printf("as your meal plan.\n"); } return(0); }