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skipping any code in between For the for loop, continue causes the increment and then the conditional test portions of the loop to execute For the while and do-while loops, program control passes to the conditional tests For example, the following program counts the number of spaces contained in the string entered by the user:
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/* Count spaces */ #include <stdioh> int main(void) { char s[80], *str; int space; printf("Enter a string: "); gets(s); str = s; for(space=0; *str; str++) { if(*str != ' ') continue; space++; } printf(''%d spaces\n", space); return 0; }
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Each character is tested to see if it is a space If it is not, the continue statement forces the for to iterate again If the character is a space, space is incremented The following example shows how you can use continue to expedite the exit from a loop by forcing the conditional test to be performed sooner:
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void code(void) { char done, ch; done = 0; while(!done) { ch = getchar(); if(ch == '$') { done = 1; continue; }
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Page 93 putchar(ch+1); /* shift the alphabet one position higher */ } }
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This function codes a message by shifting all characters you type one letter higher For example, an A becomes a B The function will terminate when you type a $ After a $ has been input, no further output will occur because the conditional test, brought into effect by continue, will find done to be true and will cause the loop to exit Expression Statements 2 covers expressions thoroughly However, a few special points are mentioned here Remember, an expression statement is simply a valid expression followed by a semicolon, as in
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func(); a = b+c; b+f(); ; /* /* /* /* a function call */ an assignment statement */ a valid, but strange statement */ an empty statement */
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The first expression statement executes a function call The second is an assignment The third expression, though strange, is still evaluated by the compiler because the function f( ) may perform some necessary task The final example shows that a statement can be empty (sometimes called a null statement) Block Statements Block statements are simply groups of related statements that are treated as a unit The statements that make up a block are logically bound together Block statements are also called compound statements A block is begun with a { and terminated by its matching } Programmers use block statements most commonly to create a multistatement target for some other statement, such as if However, you may place a block statement anywhere you would put any other statement For example, this is perfectly valid (although unusual) C code:
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#include <stdioh> int main(void) {
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Page 94 int i; { /* a free-standing block statement */ i = 120; printf(''%d", i); } return 0; }
Page 95
4 Arrays and Strings
Team-Fly
AM FL Y
Page 96
An array is a collection of variables of the same type that are referred to through a common name A specific element in an array is accessed by an index In C, all arrays consist of contiguous memory locations The lowest address corresponds to the first element and the highest address to the last element Arrays can have from one to several dimensions The most common array is the string, which is simply an array of characters terminated by a null Arrays and pointers are closely related; a discussion of one usually refers to the other This chapter focuses on arrays, while 5 looks closely at pointers You should read both to understand fully these important constructs Single-Dimension Arrays The general form for declaring a single-dimension array is type var_name[size]; Like other variables, arrays must be explicitly declared so that the compiler can allocate space for them in memory Here, type declares the base type of the array, which is the type of each element in the array, and size defines how many elements the array will hold For example, to declare a 100element array called balance of type double, use this statement:
double balance[100];
In C89, the size of an array must be specified using a constant expression Thus, in C89, the size of an array is fixed at compile time (C99 allows arrays whose sizes are determined at run time They are briefly described later in this chapter and examined in detail in Part Two) An element is accessed by indexing the array name This is done by placing the index of the element within square brackets after the name of the array For example,
balance[3] = 1223;
assigns element number 3 in balance the value 1223 In C, all arrays have 0 as the index of their first element Therefore, when you write
char p[10];
you are declaring a character array that has 10 elements, p[0] through p[9] For example, the following program loads an integer array with the numbers 0 through 99:
Page 97 #include <stdioh> int main(void) { int x[100]; /* this declares a 100-integer array */ int t; /* load x with values 0 through 99 */ for(t=0; t<100; ++t) x[t] = t; /* display contents of x */ for(t=0; t<100; ++t) printf(''%d ", x[t]); return 0; }
The amount of storage required to hold an array is directly related to its type and size For a singledimension array, the total size in bytes is computed as shown here: total bytes = sizeof(base type) length of array C has no bounds checking on arrays You could overwrite either end of an array and write into some other variable's data or even into the program's code As the programmer, it is your job to provide bounds checking where needed For example, this code will compile without error, but it is incorrect because the for loop will cause the array count to be overrun
int count[10], i; /* this causes count to be overrun */ for(i=0; i<100; i++) count[i] = i;
Single-dimension arrays are essentially lists that are stored in contiguous memory locations in index order For example, Figure 4-1 shows how array a appears in memory if it starts at memory location 1000 and is declared as shown here:
char a[7];
Generating a Pointer to an Array You can generate a pointer to the first element of an array by simply specifying the array name, without any index For example, given
int sample[10];
Page 98 Element Address a[0] 1000 a[1] 1001 a[2] 1002 a[3] 1003 a[4] 1004 a[5] 1005 a[6] 1006
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