/* Deitel & Deitel 'C How to program' pgs. 221-2             */
/* passing arrays and individual array elements to functions */
#include <stdio.h>
#define SIZE 5

void modifyArray(int[], int);
void modifyElement(int); /* doesn't do what you might expect */

main() {
       int a[SIZE] = { 0, 1, 2, 3, 4 };
       int i;
       
       printf("Original values of array are : \n");
       for (i=0; i<SIZE; i++)
           printf("%3d", a[i]);
       
       modifyArray(a, SIZE);
       printf("\nModified values of array are : \n");
       for (i=0; i<SIZE; i++)
           printf("%3d", a[i]);
           
       printf("\nEffects of passing an array element : \n");
       
       modifyElement(a[3]);
       printf("The value of a[3] is %d\n", a[3]);
       return 0;
}

void modifyArray(int b[], int size) {
     int j;
     
     for (j=0; j < size; j++)
         b[j] *= 2;
}

void modifyElement(int e) {
     printf("The value in modifyElement is %d\n", e *= 2);
}
                      
*********** now the 2d array update ***************

/* passing arrays and individual array elements to functions */
/* this one doesn't work */
#include <stdio.h>
#define SIZE 5

void modifyArray(float[][], int);
void modifyElement(float);

main() {
       float a[SIZE][SIZE] = { 0.0, 1.9, 2.4, 3.4, 4.6,
                               1.1, 2.1, 3.1, 4.1, 5.1,
                               2.3, 3.2, 4.2, 4.0, 7.1,
                               4.2, 5.5, 4.5, 5.1, 2.1,
                               3.2, 5.1, 5.3, 5.3, 1.1 };
       int i, j;
       
       printf("Original contents of the array are: \n");
       for (i=0; i<SIZE; i++) {
           for (j=0; j<SIZE; j++) {
               printf("%6.2f", a[i][j]);
           }
       }        
       
       modifyArray(a, SIZE);
       printf("\nThe modified values are :\n");    
       for (i=0; i<SIZE; i++) {
           for (j=0; j<SIZE; j++) {
               printf("%6.2f", a[i][j]);
           }
       }
       
       printf("\nEffects of passing an individual element by value"
              "\nThe value of a[3] is %6.2f\n", a[3]);
       modifyElement(a[3][3]);
       printf("The new value of a[3][3] is %6.2f\n", a[3][3]);
       return 0;
}

void modifyArray(float b[][], int size) {
     int j, k;
     
     for (j=0; j<size; j++) {
         for (k =0; k<size; k++) {
             b[j][k] *= 2;
         }
     }    
}

void modifyElement(float e) {
     printf("The value in modifyElement is %d\n", e);
}