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continues to iterate until the end of the string is reached Here, strcmp( ) returns 0 if s1 is equal to s2 It returns less than 0 if s1 is less than s2; otherwise, it returns greater than 0 Most string functions resemble strcmp( ) with regard to the way it uses pointers, especially where loop control is concerned Using pointers is faster, more efficient, and often easier to understand than using array-indexing One common error that sometimes creeps in when using pointers is illustrated by the following program:
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/* This program is incorrect */ #include <stdioh> #include <stringh> int main(void) { char *p1, s[80]; p1 = s; /* assign p1 the starting address of s */ do { printf("\nEnter string: "); gets(s); /* read a string */ /* print the decimal equivalent of each character */ while(*p1) printf(" %d", *p1++); } while(strcmp(s, "done")); return 0; }
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Can you find the error in this program The problem is that p1 is assigned the address of s only once outside the loop The first time through the loop, p1 does point to the first character in s However, in the second (and subsequent iterations), it continues from where it left off, because it is not reset to the start of the array s The proper way to write this program is
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/* This program is correct */ #include <stdioh> #include <stringh>
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int main(void) { char *p1, s[80]; do { p1 = s; /* assign p1 the starting address of s */ printf("\nEnter string: "); gets(s); /* read a string */ /* print the decimal equivalent of each character */ while(*p1) printf(" %d", *p1++); } while(strcmp(s, "done")); return 0; }
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Here, each time the loop iterates, p1 is set to the start of string s
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Arrays of Pointers
Pointers can be arrayed like any other data type The declaration for an int pointer array of size 10 is
int *x[10];
To assign the address of an integer variable called var to the third element of the array, you would write:
x[2] = &var;
To find the value of var, you would write
*x[2]
If you want to pass an array of pointers into a function, you can use the same method used for other arrays simply call the function with the array name without any indexes For example, a function that could receive array x would look like:
void display_array(int *q[]) {
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int t; for(t=0; t<10; t++) printf("%d ", *q[t]); }
Remember, q is not a pointer to integers, but to an array of pointers to integers Therefore it is necessary to declare the parameter q as an array of integer pointers as shown here You cannot declare q simply as an integer pointer because that is not what it is A common use of pointer arrays is to hold pointers to error messages You can create a function that outputs a message given its code number, as shown here:
void serror(int num) { static char *err[] = { "Cannot Open File\n", "Read Error\n", "Write Error\n", "Media Failure\n" }; printf("%s", err[num]); }
As you can see, printf( ) inside serror( ) is called with a character pointer that points to one of the various error messages indexed by the error number passed to the function For example, if num is passed a 2, the message Write Error is displayed As a point of interest, note that the command line argument argv is an array of character pointers
Pointers to Pointers: Multiple Indirection
The concept of arrays of pointers is straightforward because the indexes keep the meaning clear However, cases in which one pointer points to another can be very confusing A pointer to a pointer is a form of multiple indirection, or a chain of pointers Consider Figure 6-3 In the case of a normal pointer, the value of the pointer is the address of the location that contains the value desired In the case of a pointer to a pointer, the first pointer contains the address of the second pointer, which contains the address of the location that contains the value desired
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