Question

How to check if a sequence of numbers is an Arithmetic progression (consecutive differences are the same) in C

Answer 1

#include <stdio.h>
#include <stdlib.h>

int compare(const void *a, const void *b) {
    return (*(int*)a - *(int*)b);
}

int isArithmeticProgression(int arr[], int size) {
    if (size == 1) {
        return 1; 
    }

    qsort(arr, size, sizeof(int), compare);

    int difference = arr[1] - arr[0];
    for (int i = 2; i < size; i++) {
        if (arr[i] - arr[i - 1] != difference) {
            return 0; 
        }
    }

    return 1; 
}

int main() {
    int arr[] = {10, 20, 15, 5, 25, 35, 30};
    int size = sizeof(arr) / sizeof(arr[0]);

    (isArithmeticProgression(arr, size)) ? (printf("Yes\n")) : (printf("No\n"));

    return 0;
}


/*
run:

Yes

*/

 

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