========================================================= Exercise 7.1 - upper case to lower or lower case to upper ========================================================= Question ======== Write a program that converts upper case to lower or lower case to upper, depending on the name it is invoked with, as found in argv[0] .. literalinclude:: cprogs/ex_7.1_lower-upper.c :language: c :tab-width: 4 Explanation =========== This program converts the input string to either lower case or upper case depending on the program. This takes help of the various header files like. :: #include // Provides character handling functions like tolower() and toupper() #include // Provides input/output functions like putchar() #include // Provides string handling functions like strcmp() Visualize ========= .. raw:: html