C 4 Loops-Iteration

C 4 Loops-Iteration

1. 4.1 controlled iteration

   • for (initialize; guard; update) e.g.
     • e.g.  for(i = 1; i<= NUM_LINES; i=i+1):        statement

2. 4.4 uncontrolled iteration

   • while (guard) /statement
   • Exit the loop
     • Achieve a negated guard
     • if () {break;}
       • Flag
   • do (statement) while (guard)

3. Iterating over the input data

   • number: scanf
     • scanf('%d',&next)
   • character: getchar()
     • The int getchar(void) function reads the next available character from the screen and returns it as an integer. This function reads only single character at a time. You can use this method in the loop in case you want to read more than one character from the screen.
   • putchar(int c)