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Borland C++ Builder: The Complete Reference
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In the following example, a two-dimensional array is loaded with the numbers 1 through 12, which is then displayed row by row:
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#include <stdioh> int main(void) { int t,i, num[3][4]; /* load numbers */ for(t=0; t<3; ++t) for(i=0; i<4; ++i) num[t][i] = (t*4)+i+1; /* display numbers */ for(t=0; t<3; ++t) { for(i=0; i<4; ++i) printf("%d ", num[t][i]); printf("\n"); } return 0; }
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In this example, num[0][0] has the value 1; num[0][1], the value 2; num[0][2], the value 3; and so on The value of num[2][3] is 12 Two-dimensional arrays are stored in a row-column matrix, where the left index indicates the row and the right index indicates the column This means that the right index changes faster than the left when accessing the elements in the array in the order they are actually stored in memory See Figure 5-2 for a graphic representation of a two-dimensional array in memory In essence, the left index can be thought of as a pointer to the correct row The number of bytes of memory required by a two-dimensional array is computed using the following formula: bytes = size of 1st index * size of 2nd index * sizeof (base-type) Therefore, assuming 4-byte integers, an integer array with dimensions 10,5 would have 10 5 4 or 200 bytes allocated When a two-dimensional array is used as an argument to a function, only a pointer to the first element is passed However, a function receiving a two-dimensional array
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Arrays
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Figure 5-2
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A two-dimensional array in memory
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as a parameter must minimally define the length of the right index, because the compiler needs to know the length of each row if it is to index the array correctly For example, a function that will receive a two-dimensional integer array with dimensions 5,10 would be declared like this:
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void func1(int x[][10]) { /**/ }
You can specify the left dimension as well, but it is not necessary The compiler needs to know the size of the right dimension in order to work on statements such as
x[2][4]
inside the function If the length of the rows is not known, it is impossible to know where the next row begins The following program uses a two-dimensional array to store the numeric grade for each student in a teacher s classes The program assumes that the teacher has three
Borland C++ Builder: The Complete Reference
classes and a maximum of 30 students per class Notice how the array grade is accessed by each of the functions:
#include #include #include #include <conioh> <ctypeh> <stdioh> <stdlibh>
#define CLASSES 3 #define GRADES 30 int grade[CLASSES][GRADES]; void disp_grades(int g[][GRADES]), enter_grades(void); int get_grade(int num); int main(void) { char ch; /* class grades program */
for(;;) { do { printf("(E)nter grades\n"); printf("(R)eport grades\n"); printf("(Q)uit\n"); ch = toupper(getche()); } while(ch!='E' && ch!='R' && ch!='Q'); switch(ch) { case 'E': enter_grades(); break; case 'R': disp_grades(grade); break; case 'Q': return 0; } } } /* Enter each student's grade */ void enter_grades(void)
5:
Arrays
{ THE FOUNDATION OF C++ int t, i; for(t=0; t<CLASSES; t++) { printf("Class # %d:\n", t+1); for(i=0; i<GRADES; ++i) grade[t][i] = get_grade(i); } } /* Actually input the grade */ int get_grade(int num) { char s[80]; printf("enter grade for student # %d:\n", num+1); gets(s); return(atoi(s)); } /* Display the class grades */ void disp_grades(int g[][GRADES]) { int t, i; for(t=0; t<CLASSES; ++t) { printf("Class # %d:\n", t+1); for(i=0; i<GRADES; ++i) printf("grade for student #%d is %d\n",i+1, g[t][i]); } }
Arrays of Strings
It is not uncommon in programming to use an array of strings For example, the input processor to a database may verify user commands against a string array of valid commands A two-dimensional character array is used to create an array of strings with the size of the left index determining the number of strings and the size of the right index specifying the maximum length of each string This code fragment declares an array of 30 strings, each having a maximum length of 79 characters:
char str_array[30][80];
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