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is a single string because commas are not generally legal separators Some environments allow you to enclose within double quotes a string containing spaces This causes the entire string to be treated as a single argument Check your operating system documentation for details on the definition of command line parameters for your system You must declare argv properly The most common method is
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The empty brackets indicate that the array is of undetermined length You can now access the individual arguments by indexing argv For example, argv[0] points to the first string, which is always the program's name; argv[1] points to the first argument, and so on Another short example using command line arguments is the program called countdown, shown here It counts down from a starting value (which is specified on the command line) and beeps when it reaches 0 Notice that the first argument containing the starting count is converted into an integer by the standard function atoi( ) If the string "display" is the second command line argument, the countdown will also be displayed on the screen
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Page 157 /* Countdown program */ #include <stdioh> #include <stdlibh> #include <ctypeh> #include <stringh> int main(int argc, char *argv[]) { int disp, count; if(argc<2) { printf(''You must enter the length of the count\n"); printf("on the command line Try again\n"); exit(1); } if(argc==3 && !strcmp(argv[2], "display")) disp = 1; else disp = 0; for(count=atoi(argv[1]); count; --count) if(disp) printf("%d\n", count); putchar('\a'); /* this will ring the bell */ printf("Done"); return 0; }
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Notice that if no command line arguments have been specified, an error message is printed A program with command line arguments often issues instructions if the user attempts to run the program without entering the proper information To access an individual character in one of the command line arguments, add a second index to argv For example, the next program displays all of the arguments with which it was called, one character at a time:
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#include <stdioh> int main(int argc, char *argv[]) { int t, i; for(t=O; t<argc; ++t) {
Page 158 i = 0; while(argv[t][i]) { putchar(argv[t][i]); ++i; } printf(''\n"); } return 0; }
Remember, for argv, the first index accesses the string, and the second index accesses the individual characters of the string Usually, you use argc and argv to get initial commands into your program that are needed at startup For example, command line arguments often specify such things as a filename, an option, or an alternate behavior Using command line arguments gives your program a professional appearance and facilitates its use in batch files The names argc and argv are traditional but arbitrary You may name these two parameters to main ( ) anything you like Also, some compilers may support additional arguments to main( ), so be sure to check your compiler's documentation When a program does not require command line parameters, it is common practice to explicitly declare main( ) as having no parameters This is accomplished by using the void keyword in its parameter list The return Statement The mechanics of return are described in 3 As explained, it has two important uses First, it causes an immediate exit from the function That is, it causes program execution to return to the calling code Second, it can be used to return a value The following sections examine how the return statement is applied Returning from a Function A function terminates execution and returns to the caller in two ways The first occurs when the last statement in the function has executed, and, conceptually, the function's ending curly brace (}) is encountered (Of course, the curly brace isn't actually present in the object code, but you can think of it in this way) For example, the pr_reverse( ) function in this program simply prints the string I like C backwards on the screen and then returns
Page 159 #include <stringh> #include <stdioh> void pr_reverse(char *s); int main(void) { pr_reverse(''I like C"); return 0; } void pr_reverse(char *s) { register int t; for(t=strlen(s)-l; t>=0; t--) putchar(s[t]); }
Once the string has been displayed, there is nothing left for pr_reverse( ) to do, so it returns to the place from which it was called Actually, not many functions use this default method of terminating their execution Most functions rely on the return statement to stop execution either because a value must be returned or to make a function's code simpler and more efficient A function may contain several return statements For example, the find_substr( ) function in the following program returns the starting position of a substring within a string, or it returns if no 1 match is found It uses two return statements to simplify the coding
#include <stdioh> int find_substr(char *s1, char *s2); int main(void) { if(find_substr("C is fun", "is") != -1) printf("Substring is found"); return 0; } /* Return index of first match of s2 in s1 */
Page 160 int find_substr(char *s1, char *s2) { register int t; char *p, *p2; for(t=0; s1[t]; t++) p = &s1[t]; p2 = s2; while(*p2 && *p2==*p) { p++; p2++; } if(!*p2) return t; /* 1st return */ } return -1; /* 2nd return */ }
Returning Values All functions, except those of type void , return a value This value is specified by the return statement In C89, if a non-void function executes a return statement that does not include a value, then a garbage value is returned This is, to say the least, bad practice! In C99 (and C++), a non-void function must use a return statement that returns a value That is, in C99, if a function is specified as returning a value, any return statement within it must have a value associated with it However, if execution reaches the end of a non-void function (that is, encounters the function's closing curly brace), a garbage value is returned Although this condition is not a syntax error, it is still a fundamental flaw and should be avoided As long as a function is not declared as void, you can use it as an operand in an expression Therefore, each of the following expressions is valid:
x = power(y); if(max(x,y) > 100) printf(''greater"); for(ch=getchar(); isdigit(ch); ) ;
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