C2007-09-22
Variable Scope and functions in C
The functions and external variables that make up a C program need not all be compiled at the same time; the source text of the program may be kept in several files, and previously
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C2007-09-22
Example Calculator program in C - describing use of External Variables in C
A C program consists of a set of external objects, which are either variables or functions. The adjective ``external'' is used in contrast to ``internal'', which describes the argu
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getch and ungetch in C
What are getch and ungetch? It is often the case that a program cannot determine that it has read enough input until it has read too much. One instance is collecting characters tha
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Functions returning non-integer values in C
Many numerical functions like sqrt, sin, and cos return double; other specialized functions return other types than int. To illustrate how to deal with this, let us write and use t
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A C program similar to grep command in UNIX
Let us design and write a program to print each line of its input that contains a particular ``pattern'' or string of characters. (This is a special case of the UNIX program grep.)
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goto and labels in C
C provides the infinitely-abusable goto statement, and labels to branch to. Formally, the goto statement is never necessary, and in practice it is almost always easy to write code
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C2007-09-20
break and continue loops in C
It is sometimes convenient to be able to exit from a loop other than by testing at the top or bottom. The break statement provides an early exit from for, while, and do, just as fr
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Do while Loops in C
The while and for loops test the termination condition at the top. By contrast, the third loop in C, the do-while, tests at the bottom after making each pass through the loop body;
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While and For Loops in C
expression is evaluated. If it is non-zero, statement is executed and expression is re-evaluated. This cycle continues until expression becomes zero, at which point execution resum
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switch in C
The switch statement is a multi-way decision that tests whether an expression matches one of a number of constant integer values, and branches accordingly.
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else if statement in C
This sequence of if statements is the most general way of writing a multi-way decision. The expressions are evaluated in order; if an expression is true, the statement associated w
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The if else statement in C
The if-else statement is used to express decisions. Formally the syntax is
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