Week04--newLecture2

# Times vri v1i v2i sum v elements 13 pointers

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Unformatted text preview: r[3] = {0, 0, 0}; • The prototype for a vector sum funcCon: void v_sum(double v1, double v2, double vr); 12 Passing by Reference Example (cont’d) /* Function: v_sum * Purpose: Computes the sum of two vectors * Input: * v1 – array containing first vector * v2 – array containing second vector * Output: * vr – resultant vector of v1 + v2 */ void v_sum(double v1, double v2, double vr) { int i; // declare loop control variable for(i = 0; i < 3; i++) // loop 3 times vr[i] = v1[i] + v2[i]; // sum v elements } 13 Pointers and Arrays • Pointers and arrays have a close relaConship • Any operaCon that can be done using array subscripCng can be done using pointers. 14 Pointers and Arrays (cont’d) • Recall the array declaraCon int y[10]; /* declares an integer array with */ /* 10 elements */ y[0] y[1] y[2] y[3] y[4] y[5] y[6] y[7] y[8] y[9] y: • Then if py is declared a pointer to an integer int *py; we can assign the pointer to an element of the array by py = &y[0]; 15 Pointers and Arrays (cont’d) • The assignment py = &y[0]; sets py to point to ele...
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