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c19

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This commit is contained in:
Akbar Rahman 2023-10-07 15:16:39 +01:00
parent c6262d8343
commit 4052a7756f
Signed by: alvierahman90
GPG Key ID: 20609519444A1269
5 changed files with 346 additions and 0 deletions
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55
C18/ex2.c Normal file
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#include <stdio.h>
#include <stdlib.h>
// Main () - execution starts here
int main (void)
{
// Declate file stream variables
FILE *fInput, *fOutput;
// Other variables needed
int i, d, d2;
// Try and open the text "sample.txt" (in the current directory) file for writing
fOutput = fopen ("numbers.txt", "w");
// Check we were able to open the file
if ( fOutput == NULL)
{
printf ("The file could not be opened for writing, exiting\n");
return -1;
}
// Use a loop to write values to the newly created file
for ( i = 1 ; i <= 10 ; i++)
{
fprintf (fOutput, "%d %d\n", i, i*i);
}
// And close the file
fclose (fOutput);
// Try and open the binary "numbers " (in the current directory) file for reading
fInput = fopen ("numbers.txt", "r");
// Check we were able to open the file
if ( fInput == NULL)
{
printf ("The file could not be opened for reading, exiting\n");
return -1;
}
// Read, line by line the 10 values written into variable d
// and then display the contents of d on the screen
for ( i = 1 ; i <= 10 ; i++)
{
fscanf (fInput, "%d %d", &d, &d2);
printf ("Value read from file: %d %d\n", d, d2);
}
// And close the file
fclose (fInput);
return (0); // Exit indicating success
}

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#include <stdio.h>
#include <stdlib.h>
// Main () - execution starts here
int main (void)
{
// Declate file stream variables
FILE *fInput, *fOutput;
// 8x the maximum filename length on most filesystems should be a decent size
char filename[2049] = { 0 };
printf("Enter filename: ");
scanf("%2048s", filename);
// Other variables needed
int i, d, d2;
// Try and open the text "sample.txt" (in the current directory) file for writing
fOutput = fopen (filename, "w");
// Check we were able to open the file
if ( fOutput == NULL)
{
printf ("The file could not be opened for writing, exiting\n");
return -1;
}
// Use a loop to write values to the newly created file
for ( i = 1 ; i <= 10 ; i++)
{
fprintf (fOutput, "%d %d\n", i, i*i);
}
// And close the file
fclose (fOutput);
// Try and open the binary "numbers " (in the current directory) file for reading
fInput = fopen ("numbers.txt", "r");
// Check we were able to open the file
if ( fInput == NULL)
{
printf ("The file could not be opened for reading, exiting\n");
return -1;
}
// Read, line by line the 10 values written into variable d
// and then display the contents of d on the screen
for ( i = 1 ; i <= 10 ; i++)
{
fscanf (fInput, "%d %d", &d, &d2);
printf ("Value read from file: %d %d\n", d, d2);
}
// And close the file
fclose (fInput);
return (0); // Exit indicating success
}

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C18/ex4.c Normal file
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#include <stdio.h>
#include <math.h>
#include <stdlib.h>
float degrees_to_radians(float degrees) {
return M_PI * degrees / 180.0;
}
// Simple function to populate an integer array
void PopulateTheArray ( int Size, float ArrayData[])
{
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[])
{
int i; // Variable to use in our loop
for ( i = 0 ; i < Size ; i++)
{
printf ("%d\t%0.3f\n", i, ArrayData[i]);
}
}
int SaveArray (char *filename, int Size, float ArrayData[])
{
FILE *fp; // File Pointer
int i; // Variable to use in our loop
fp = fopen(filename, "w");
// if file open failed, return error to caller
if (fp == NULL) {
return 1;
}
for ( i = 0 ; i < Size ; i++)
{
fprintf(fp, "%d\t%0.3f\n", i, ArrayData[i]);
}
// close file, returns 0 on successful closing (therefore function has executed sucessfully)
return fclose(fp);
}
// Main () - execution starts here
int main (void)
{
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);
// Use calloc with checking
pData = calloc( iSizeForArray, sizeof (float));
// 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);
rc = SaveArray(filename, iSizeForArray, pData);
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
}

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#include <stdio.h>
#include <math.h>
#include <stdlib.h>
float degrees_to_radians(float degrees) {
return M_PI * degrees / 180.0;
}
// Simple function to populate an integer array
void PopulateTheArray ( int Size, float ArrayData[])
{
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[])
{
int i; // Variable to use in our loop
for ( i = 0 ; i < Size ; i++)
{
printf ("%d\t%0.3f\n", i, ArrayData[i]);
}
}
int SaveArrayBinary (char *filename, int Size, float ArrayData[])
{
FILE *fp; // File Pointer
int i; // Variable to use in our loop
fp = fopen(filename, "wb");
// 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)
{
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);
// Use calloc with checking
pData = calloc( iSizeForArray, sizeof (float));
// 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);
rc = SaveArrayBinary(filename, iSizeForArray, pData);
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
}

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#include <stdio.h>
#include <stdlib.h>
int main() {
FILE *fp; // file pointer
float *data; // data pointer (array of floats)
int i, file_size, arr_size;
char filename[2049];
printf("Enter filename to read: ");
scanf("%2048s", filename);
fp = fopen(filename, "rb");
if (fp == NULL) {
printf("Failed to open file\n");
return 1;
}
// get file size (technically isn't the best way because SEEK_END is undefined behaviour:
//
// "Library implementations are allowed to not meaningfully support SEEK_END
// (therefore, code using it has no real standard portability)."
// ~ https://cplusplus.com/reference/cstdio/fseek/
//
// " Setting the file position indicator to end-of-file, as with fseek(file, 0, SEEK_END),
// has undefined behavior for a binary stream (because of possible trailing null characters) or
// for any stream with state-dependent encoding that does not assuredly end in the initial shift
// state. "
// ~ https://port70.net/~nsz/c/c11/n1570.html#note268
//
// it is also limited to 2GB files as it returns a signed integer
// better to use something like this probably:
// https://stackoverflow.com/a/238609
//
// but louise uses fseek so i will too
fseek(fp, 0, SEEK_END);
file_size = ftell(fp);
arr_size = file_size/sizeof(float);
rewind(fp);
// allocate memory and read data
data = malloc(file_size);
fread(data, sizeof(float), arr_size, fp);
for (i = 0; i < arr_size; i++) {
printf("%d %0.3f\n", i, data[i]);
}
free(data);
}