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