ECE 175 assignment 4

1.1 Determine the output of the following block of code (5 pts).

int x = 4, y = 9;

x = x * 10;

y = x - y;

x = y/x;

printf(“%d\t%d\t%f”, x, y, y/2.0);

1.2 Write a block of code equivalent to the code below using a while loop instead of a for loop. Determine the values of i, x, N after the loop has terminated (5 pts).

int i, x = 4, N 5;

for (i = 1; i < N; i +=2)

{

x += 1;

}

1.3 Determine the value of j after the following code is executed. Please explain your answer! (5 pts).

double x = 2.4;

int i = 3, j = 4;

if ( 2 * j > 4 * x )

j = 10;

else if ( i%j )

j = 20;

else

j = 30;

1.4. Hand trace all values of i and m during the execution of the following for loop (5 pts)

int i = 4, m = 8; i m

initial value:

while ( i > 0 ) 1^st iteration:

{ 2^nd iteration:

m /= 2; ...

i -= 1; ...

}

2. Code execution

2.1 Determine the output of the following program (5 pts).

#include <stdio.h>

int main(void)

{

int i, j;

for (i = 0; i < 3; i++) {

for (j = 0; j < i; j++) {

printf("%d ", i*j);

}

printf("\n");

}

return 0;

}

1.3 Convert the following while loop to a for loop

i = 10;

while ( i > 0)

{

printf("%d, %d\n", i, 10*i);

i-=2;

}

3. Code composition

3.1 A geometric series is defined as a series of numbers with a constant ratio between successive terms. For example, in the series ½+1/4+1/8…, the ratio between two successive numbers is equal to ½.

Write a function named series_sum that computes the finite sum of the first n terms. Your function shall receive as input the ratio between successive terms and the number of terms to be added, and returns the series sum.