1 // Calculates the max or min in an array of numbers; 2 // of type int; 3 4 #include <stdio.h> 5 #include <stdlib.h> 6 #include <limits.h> 7 8 #define MAX_ELEM 10 9 #define NO_ARGUMENT_ENTERED 1 10 #define EXTREMO_ARGUMENT 1 11 12 typedef enum { 13 MAXIMUM, 14 MINIMUM 15 } extreme_t; 16 17 typedef enum { 18 OK, 19 ERROR_INVOCATING_PROGRAM, 20 ERROR_NULL_POINTER 21 } status_t; 22 23 status_t validate_arguments (int argc, char ** argv); 24 25 int main (int argc, char * argv[]) 26 { 27 size_t i; 28 int vector[MAX_ELEM] = {9, 10, 25, 31, 9, 5, 11, 46, 50, 20}; 29 extreme_t extremo; 30 status_t st; 31 32 if((st = validate_arguments(argc, argv)) != OK) 33 return st; 34 35 extremo = atoi(argv[EXTREMO_ARGUMENT]); 36 if(extremo == MAXIMUM) { 37 // Find maximum element in array; 38 int maximum; 39 for(i = 0, maximum = INT_MIN; i < (sizeof(vector)/sizeof(vector[0])); i++) 40 if(vector[i] > maximum) 41 maximum = vector[i]; 42 43 printf("%d\n", maximum); 44 } else if (extremo == MINIMUM){ 45 // Find minimum element in array; 46 int minimum; 47 for(i = 0, minimum = INT_MAX; i < (sizeof(vector)/sizeof(vector[0])); i++) 48 if(vector[i] < minimum) 49 minimum = vector[i]; 50 51 printf("%d\n", minimum); 52 } 53 return 0; 54 } 55 56 status_t validate_arguments (int argc, char ** argv) { 57 if(argc == NO_ARGUMENT_ENTERED) 58 return ERROR_INVOCATING_PROGRAM; 59 60 else if (argv == NULL) 61 return ERROR_NULL_POINTER; 62 63 else return OK; 64 } 65
