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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
typedef struct {
char all_equal; // true if all numbers were equal
int max; // the greatest number
} Result;
void read_numbers(int *dst, int count);
Result find_greatest(int *numbers, int count);
void output_result(const Result *r);
int main() {
enum { N = 3 };
int numbers[N];
read_numbers(numbers, N);
const Result r = find_greatest(numbers, N);
output_result(&r);
}
void read_numbers(int *dst, int count) {
assert(count > 0);
printf("Enter %d numbers.\n", count);
for (int i = 0; i < count; /*empty*/) {
printf("#%d: ", i+1);
int c = scanf("%d", &dst[i]);
if (c == EOF) abort();
if (c != 1) {
printf("Sorry, invalid input. Try again.\n");
while ((c = getchar()) != EOF && c != '\n');
if (c == EOF) abort();
} else
i++;
}
}
Result find_greatest(int *numbers, int count) {
assert(count > 0);
Result r = {.all_equal = 1, .max = numbers[0]};
for (int i = 1; i < count; i++) {
r.all_equal = r.all_equal && numbers[i] == r.max;
if (numbers[i] > r.max) r.max = numbers[i];
}
return r;
}
void output_result(const Result *r) {
if (r->all_equal) printf("All numbers are equal.\n");
else printf("%d is the greatest among the numbers entered.\n", r->max);
}
Compiling Program...
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