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Author SHA1 Message Date
dd75cd75e7
complete c21 2023-10-26 20:24:04 +01:00
3640e0ed6a
complete c20 2023-10-26 20:23:46 +01:00
3 changed files with 189 additions and 0 deletions

125
Exercises/C20/ex1.c Normal file
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// Modified from C18 Ex5
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#define DEBUG_MAIN
#define DEBUG_FNS
float degrees_to_radians(float degrees) {
#ifdef DEBUG_FNS
printf("degrees_to_radians(degrees=%f): called\n", degrees);
#endif
return M_PI * degrees / 180.0;
}
// Simple function to populate an integer array
void PopulateTheArray ( int Size, float ArrayData[])
{
#ifdef DEBUG_FNS
printf("PopulateTheArray(Size=%d, ArrayData): called\n", Size);
#endif
int i; // Variable to use in our loop
for ( i = 0 ; i < Size ; i++)
{
ArrayData[i] = degrees_to_radians(i); // Treat it like a normal array
}
}
// Simple function do display contents an integer array
void DisplayTheArray ( int Size, float ArrayData[])
{
#ifdef DEBUG_FNS
printf("DisplayTheArray(Size=%d, ArrayData): called\n", Size);
#endif
int i; // Variable to use in our loop
for ( i = 0 ; i < Size ; i++)
{
#ifdef DEBUG_FNS
printf("DisplayTheArray(): i=%d\n", i);
#endif
printf ("%d\t%0.3f\n", i, ArrayData[i]);
}
}
int SaveArrayBinary (char *filename, int Size, float ArrayData[])
{
#ifdef DEBUG_FNS
printf("DisplayTheArray(filename=%s, Size=%d, ArrayData): called\n", filename, Size);
#endif
FILE *fp; // File Pointer
int i; // Variable to use in our loop
fp = fopen(filename, "wb");
#ifdef DEBUG_FNS
printf("DisplayTheArray(): fp=%p\n", fp);
#endif
// if file open failed, return error to caller
if (fp == NULL) {
return 1;
}
// write data
fwrite(ArrayData, sizeof(float), Size, fp);
// close file, returns 0 on successful closing (therefore function has executed sucessfully)
return fclose(fp);
}
// Main () - execution starts here
int main (void)
{
#ifdef DEBUG_MAIN
printf("main(): called\n");
#endif
char filename[2049];
int rc, iSizeForArray;
float *pData; // A pointer to hold the base address of out array
// Ask for the size of the array and store result
printf("Please enter the size of the array to dynamically allocate: ");
scanf ("%d", &iSizeForArray);
#ifdef DEBUG_MAIN
printf("main(): iSizeForArray=%d\n", iSizeForArray);
#endif
// Use calloc with checking
pData = calloc( iSizeForArray, sizeof (float));
#ifdef DEBUG_MAIN
printf("main(): pData=%p\n", pData);
#endif
// Check we got the memory
if ( pData == NULL)
{
printf ("Sorry, I could not allocate the memory, bye!\n");
return -1;
}
// Pass the size, iSizeForArray) and the pointer created
// which points to the start of the sucesfully allocated memory
PopulateTheArray(iSizeForArray, pData);
DisplayTheArray(iSizeForArray, pData);
// Exercise doesn't ask to use function but kind of pointless without
printf("Enter filename: ");
scanf("%2048s", filename);
#ifdef DEBUG_MAIN
printf("main(): filename=%s\n", filename);
#endif
rc = SaveArrayBinary(filename, iSizeForArray, pData);
#ifdef DEBUG_MAIN
printf("main(): rc=%d\n", rc);
#endif
if (rc != 0) {
printf("Error saving file\n");
free(pData);
return rc;
}
free(pData); // Free up the memory before exiting
return (0); // Exit indicating sucess
}

20
Exercises/C21/ex1.c Normal file
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#include <stdlib.h>
#include <stdio.h>
int main(int argc, char *argv[]) {
int age;
char name[10];
if ( argc != 3 )
{
printf ("USAGE: %s name age\n",argv[0]);
exit (0);
}
sscanf(argv[1],"%s",name);
sscanf(argv[2],"%d",&age);
printf ("age=%d name=%s\n", age, name);
return 0;
}

44
Exercises/C21/ex2.c Normal file
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// Modified from C10 Ex5
#include <stdlib.h>
#include <stdio.h>
int date_to_day(int year, int month, int day) {
if (month < 3) {
month += 12;
year -= 1;
}
return ((13*month+3)/5 + day + year + year/4 - year/100 + year/400) % 7;
}
void print_day_of_week(int day) {
switch (day) {
case 0: printf("Monday\n"); break;
case 1: printf("Tuesday\n"); break;
case 2: printf("Wednesday\n"); break;
case 3: printf("Thursday\n"); break;
case 4: printf("Friday\n"); break;
case 5: printf("Saturday\n"); break;
case 6: printf("Sunday\n"); break;
}
}
int main(int argc, char *argv[]) {
int rc, year, month, day, nd;
if ( argc != 4 )
{
printf ("USAGE: %s year month day\n",argv[0]);
exit (0);
}
sscanf(argv[1],"%d",&year);
sscanf(argv[2],"%d",&month);
sscanf(argv[3],"%d",&day);
nd = date_to_day(year, month, day);
print_day_of_week(nd);
return 0;
}