1 /* Populates the direction in memory pointed by every element of an array 2 * of 10 pointers to float with 10 numbers entered via stdin. */ 3 4 #include <stdio.h> 5 #include <stdlib.h> 6 #include <float.h> 7 8 #define BUFFER_LEN 10 9 10 int main (void) 11 { 12 char aux, buffer[BUFFER_LEN + 1]; 13 float *pf[10]; 14 double *sum; 15 size_t i; 16 17 printf("%d\n", FLT_MAX); 18 printf("%d\n", FLT_DIG); 19 20 if(!(sum = (double *)calloc(1, sizeof(double)))) 21 return 1; 22 23 /* Makes every pointer point to a space in memmory with space for one float number */ 24 for(i = 0; i < 10; i++) { 25 if(!(pf[i] = (float *)calloc(1, sizeof(float)))) { 26 for(size_t j = i; j > 0; j--) 27 free(pf[j]); 28 29 return 1; 30 } 31 } 32 33 /* Populates the array with user input converted to float, computes the sume of all 34 * the converted numbers and then frees the memmory since it's no longer needed */ 35 for(i = *sum = 0; i < 10 ; i++) { 36 if(!fgets(buffer, BUFFER_LEN, stdin)) return 2; 37 *sum += (*pf[i] = strtof(buffer, NULL)); 38 39 printf("%p: %5f\n", pf[i], *pf[i]); 40 free(pf[i]); 41 while(((aux = getchar()) != 10) && (aux != 13)) 42 putchar(aux); 43 } 44 45 printf("\nsum: %5f\n", *sum); 46 47 free(sum); 48 return 0; 49 }
