Path: blob/master/source/cprogramming/Ex_1.17_lengt80.rst
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========================================================= Exercise 1.17 - Print lines that are longer than 80 chars ========================================================= Question -------- Write a program to print all input lines that are longer than 80 characters. Solution -------- .. literalinclude:: ../../languages/cprogs/Ex_1.17_lengt80.c :language: c :tab-width: 2 .. runcode:: ../../languages/cprogs/Ex_1.17_lengt80.c :language: c :codesite: ideone Explanation =========== A string in C is a character array which ends in ``\0``. getline is a function in our program, which reads one character at a time using getchar and stores it in a character array called s[] and it returns the length of the array. When an array is sent as argument to the function, like ``line[MAXLINE]`` is sent to ``getline`` function, the value is passed by reference, which means that any changes the function makes will be available to the main program. ``getline`` returns the length of the line and in our main program, if the length is greater than 80 characters we print it. .. seealso:: * :c-suggest-improve:`Ex_1.17_lengt80.c` * :c-better-explain:`Ex_1.17_lengt80.rst`