C2007-09-20
Data Types and Sizes in C
There are only a few basic data types in C: char, int, float, double.
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C2007-09-20
External Variables and Scope in C
The variables in main, such as line, longest, etc., are private or local to main. Because they are declared within main, no other function can have direct access to them. The same
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Character Arrays in C
The most common type of array in C is the array of characters. To illustrate the use of character arrays and functions to manipulate them, let's write a program that reads a set of
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Arguments - Call by Value in C
One aspect of C functions may be unfamiliar to programmers who are used to some other languages, particulary Fortran. In C, all function arguments are passed ``by value.'' This mea
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Functions in C
In C, a function is equivalent to a subroutine or function in Fortran, or a procedure or function in Pascal. A function provides a convenient way to encapsulate some computation, w
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Arrays sample program in C
This is a sample program to count the number of occurrences of each digit, of white space characters (blank, tab, newline), and of all other characters. This is artificial, but it
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C2007-09-20
Word Counting sample program in C
The following C program counts lines, words, and characters, with the loose definition that a word is any sequence of characters that does not contain a blank, tab or newline. This
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Line Counting sample program in C
The following C program counts input lines. The standard library ensures that an input text stream appears as a sequence of lines, each terminated by a newline. Hence, counting lin
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Character Counting sample program in C
The character counting program accumulates its count in a long variable instead of an int. long integers are at least 32 bits. Although on some machines, int and long are the same
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File Copying in C
Given getchar and putchar, you can write a surprising amount of useful code without knowing anything more about input and output. The simplest example is a program that copies its
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Symbolic Constants using #define in C
It's bad practice to bury ``magic numbers'' like 300 and 20 in a program; they convey little information to someone who might have to read the program later, and they are hard to c
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The for statement in C
The for statement is a loop, a generalization of the while. If you compare it to the earlier while, its operation should be clear. Within the parentheses, there are three parts, se
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