CS 330 Lecture 11 – Hi, C
February 15, 2012 by Chris Johnson. Filed under
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cs330, lectures, spring 2012.
Agenda
- quiz review
- Call subclass in Flop
- the birth of C
- compiling
- printf
- sizeof
- functions and forward declarations
- scanf
- getting addresses with &
- pointers
Code
first.c
#include <stdio.h>
// ----------------------------------------------------------------------------
// Function declarations
// ----------------------------------------------------------------------------
void clamp(int *number);
void clampByValue(int number);
// ----------------------------------------------------------------------------
// Function implementations
// ----------------------------------------------------------------------------
int main(int argc, char **argv) {
double d;
float f;
char c;
int i = 67;
short int s;
long int l;
/* unsigned char c; */
/* unsigned int i = 67; */
/* unsigned short int s; */
/* unsigned long int l; */
printf("int: %d\n", sizeof(int));
printf("double: %d\n", sizeof(double));
printf("float: %d\n", sizeof(float));
printf("char: %d\n", sizeof(char));
printf("short int: %d\n", sizeof(short int));
printf("long int: %d\n", sizeof(long int));
printf("long long int: %d\n", sizeof(long long int));
printf("Hey, user. Gimme two numbers: ");
int a;
int b;
scanf("%d %d", &a, &b);
printf("a: %d\n", a);
printf("b: %d\n", b);
/* clamp(&a); */
/* clamp(&b); */
clampByValue(a);
clampByValue(b);
printf("a: %d\n", a);
printf("b: %d\n", b);
return 17;
}
void clamp(int *number) {
if (*number < 0) {
*number = 0;
} else if (*number > 100) {
*number = 100;
}
}
void clampByValue(int number) {
if (number < 0) {
number = 0;
} else if (number > 100) {
number = 100;
}
}
Haiku
Goodbye, exceptions!
Hello, segmentation faults–
We can only hope.