1. Announcements Homework #5 due Monday 1:30pm
submission instructions will be posted on Piazza
GadgetsProduced should be 5,000,000
stop looping when temp goes above 100
Upcoming office hours:
Tomorrow: Sheng 12-1:30pm
Monday: Chris 11am-12pm 1 1 1 1 1

2. Schedule
Last time: Loops and conditionals (chp. 13); Functions (sec )
Today: how functions work (sec. 12.5, 14.3)
Monday: more on functions
Next week: arrays, strings, pointers (chp. 16) 2 2 2 2 2

3. #include <stdio.h> #include <stdlib.h>
int power(int, int);
main() {
int a = 4, b = 7;
int k = power(a, b);
printf(“%d\n”, k); }
int power(int x, int y) {
int i, result;
for (i = 0; i < y; i++) {
result *= x;
return result; 3 3

4. #include <stdio.h> #include <stdlib.h>
int power(int, int);
main() {
int a = 4, b = 7;
int k = power(a, b);
printf(“%d\n”, k); }
int power(int x, int y) {
int i, result;
for (i = 0; i < y; i++) {
result *= x;
return result;
Function declaration 4 4

5. #include <stdio.h> #include <stdlib.h>
int power(int, int);
main() {
int a = 4, b = 7;
int k = power(a, b);
printf(“%d\n”, k); }
int power(int x, int y) {
int i, result;
for (i = 0; i < y; i++) {
result *= x;
return result;
Function definition
x and y are parameters 5 5

6. #include <stdio.h> #include <stdlib.h>
int power(int, int);
main() {
int a = 4, b = 7;
int k = power(a, b);
printf(“%d\n”, k); }
int power(int x, int y) {
int i, result;
for (i = 0; i < y; i++) {
result *= x;
return result;
Function call
a and b are arguments 6 6