#include <stdio.h>
#include <stdbool.h>
#include <stddef.h>
/*
all_of_equal: Check whether ALL elements in an array
are equal to a specific value.
Parameters:
arr - pointer to the first element of the array
n - number of elements
value - the value to compare against
Returns:
true - if every element equals 'value'
false - otherwise
Idiomatic C approach:
- Use a simple loop (fast and predictable).
- Stop immediately when the first mismatch is found (efficient).
*/
bool all_of_equal(const int *arr, size_t n, int value) {
for (size_t i = 0; i < n; ++i) {
if (arr[i] != value) {
return false; // Early exit: found a mismatch
}
}
return true; // All elements matched
}
int main(void) {
int data1[] = { 5, 5, 5, 5 };
int data2[] = { 3, 3, 4, 3 };
int data3[] = { 7, 7, 7, 7 };
size_t size1 = sizeof(data1) / sizeof(data1[0]);
size_t size2 = sizeof(data2) / sizeof(data2[0]);
size_t size3 = sizeof(data3) / sizeof(data3[0]);
printf("All equal to 5 in data1? %s\n",
all_of_equal(data1, size1, 5) ? "true" : "false");
printf("All equal to 3 in data2? %s\n",
all_of_equal(data2, size2, 3) ? "true" : "false");
printf("All equal to 7 in data3? %s\n",
all_of_equal(data3, size3, 7) ? "true" : "false");
return 0;
}
/*
run:
All equal to 5 in data1? true
All equal to 3 in data2? false
All equal to 7 in data3? true
*/
