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void display(int num) { printf("%d ", num); }
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The parameter to display( ) is of type int It is not relevant that display( ) is called by using an array element, because only that one value of the array is passed It is important to understand that when an array is used as a function argument, its address is passed to a function This is an exception to the call-by-value parameter passing convention In this case, the code inside the function is operating on, and potentially altering, the actual contents of the array used to call the function For example, consider the function print_upper( ), which prints its string argument in uppercase:
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#include <stdioh> #include <ctypeh> void print_upper(char *str); int main(void) { char s[80]; /* print string as uppercase */
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printf("Enter a string: "); gets(s); print_upper(s); printf("\ns is now uppercase: %s", s); return 0; } void print_upper(char *str) { register int t; for(t=0; str[t]; ++t) { str[t] = toupper(str[t]); putchar(str[t]); } }
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After the call to print_upper( ), the contents of array s in main( ) are changed to uppercase If this is not what you want, you could write the program like this:
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#include <stdioh> #include <ctypeh> void print_upper(char *str); int main(void) { char s[80]; /* print string as uppercase */
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printf("Enter a string: "); gets(s); print_upper(s); printf("\ns is unchanged: %s", s); return 0; } void print_upper(char *str) { register int t; for(t=0; str[t]; ++t) putchar(toupper(str[t])); }
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In this case, the contents of array s remain unchanged because its values are not altered inside print_upper( ) The standard library function gets( ) is a classic example of passing arrays into functions Although the gets( ) in C++ Builder s library is more sophisticated, the following example will give you an idea of how it works To avoid confusion with the standard function, this one is called xgets( ):
/* A simple version of the gets() library function */ char *xgets(char *s) { char ch, *p; int t;
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p = s; THE FOUNDATION OF C++ for(t=0; t<80; ++t) { ch = getchar(); switch(ch) { case '\n': s[t] = '\0'; /* terminate the string */ return p; case '\b': if(t>0) t--; break; default: s[t] = ch; } } s[79] = '\0'; return p; }
The xgets( ) function must be called with a char * pointer This, of course, can be the name of a character array, which by definition is a char * pointer Upon entry, xgets( ) establishes a for loop from 0 to 79 This prevents larger strings from being entered at the keyboard If more than 80 characters are entered, the function returns (The real gets( ) function does not have this restriction) Because C/C++ has no built-in bounds checking, you should make sure that any array used to call xgets( ) can accept at least 80 characters As you type characters on the keyboard, they are placed in the string If you type a backspace, the counter t is reduced by 1, effectively removing the previous character from the array When you press ENTER, a null is placed at the end of the string, signaling its termination Because the array used to call xgets( ) is modified, upon return it contains the characters that you type
argc and argv Arguments to main( )
Sometimes it is useful to pass information into a program when you run it Generally, you pass information into the main( ) function via command line arguments A command line argument is the information that follows the program s name on the command line of the operating system For example, when you compile programs using C++ Builder s command line compiler, you type something like bcc32 program_name
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