groups and frequencies_simple.c

//input size and size number of integers, output range and frequencies
#include <stdio.h>

int main() {
    int arr[99] = { 0 }, aSize = 0;
    int sort[11] = { 0 }, sSize = 11;

    printf("Enter size: "); scanf("%d", &aSize);
    printf("Enter elements: ");
    for (int i = 0; i < aSize; i++) {
        scanf("%d", &arr[i]);
    }

    printf("Elements: ");
    for (int i = 0; i < aSize; i++) {
        printf("%d, ", arr[i]);
        sort[arr[i] / 10]++;
    }

    printf("\n\n      range\t\tFrequency");
    for (int i = 0; i/10 < sSize; i+=10) {
        printf("\n  %d\tto\t%d\t    %d", i, i + ((i == 100) ? 0 : 9), sort[i/10]);
    }
    return 0;
}